CAPÍTULO 13 – ASKELAND 6ta EDICIÓN 13-2 ¿A qué se re!ere" #as te$%eraturas A 1& A3 ' A($) ¿Estas te$%eraturas s*" (*"sta"tes) Las tres son límites de transformación de fases. Para temperaturas por debajo de A3 existe la formación de ferrita; para A 1, es la temperatura en la cual se da la reacción eutectoide; y por último, el limite A cm indica el comieno de formación de cementita. !olo el límite de la reacción eutectoide es constante, pues para los otros límites el "alor del comieno de transformación de fases depende de la concentración de carbono. 13-+ Est!$e e# ",$er* AISI-SAE %ara a(er*s que te"a" #as s!u!e"tes $!(r*estru(turas. a/ 30 e e %er#!ta%er#!ta-62 62 e err!ta err!ta %r!$ar %r!$ar!a !a / 43 e %er#!ta-5 %er#!ta-5 e (e$e"t!t (e$e"t!ta a %r!$ar!a %r!$ar!a (/ 45 e e %er#!t %er#!ta-3 a-3 e (e$e" (e$e"t!t t!taa / 06 e err err!ta !ta-1+ -1+ e (e$e"t (e$e"t!t !taa S*#u(!". a# 3$% 3$% de perl perlit ita& a&'( '(% % de ferri erritta prim primar aria ia 62 =
0.77 − x 0.77 −0.0218
∗100
x =0.306 C
)umero A*!*&!A+ Acero 1-3b#
3% 3% de de per perllita& ita&/% /% de ceme cement ntit ita a pr primar imariia 93 =
6.67− x 6.67− 0.77
∗100
x =1.183 C
)umero A*!*&!A+ Acero 1-1(c#
/% de de pe perlita&3% de ce cementita 97 =
6.67− x 6.67 −0
∗100
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x =0.200 C
)umero A*!*&!A+ Acero 1-(d#
$'% $'% de ferri rrita&10% 10% de cementita 86 =
6.67− x 6.67 −0
∗100
x =0.934 C
)umero A*!*&!A+ Acero 1-.
13-6 D*s $uestras e a(er* (*"t!e"e" 43 e %er#!ta7 Est!$e e# (*"te"!* e (ar*"* e (aa $uestra s! se sae que u"a es 8!%*eute(t*!e ' #a *tra 8!%ereu(te(t*!e7 S*#u(!*". Para encontrar el % de carbono nos apoyaremos de la re2la de la palanca. onde x es la cantidad de carbono. Para la muestra 4ipoeutectoide % Perlita5 93 100
5
6.67 − x 6.67 −0.77 6.67 − x 5.9
61--%53%
57 x5 '.'/ 8 .69-.3#
∴
x51.1$3%:
Para la muestra 4ipereutectoide 6.67 − x % Perlita5 6.67 −2.1 61--%53% 93 100
5
6.67 − x 4.57
57 x5 '.'/ 8 0./69-.3#
13-0 C*$%#ete #a s!u!e"te ta#a.
∴
x5(.01%:
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Te$%eratura A3 * A($ Te$%eratura e "*r$a#!;a(!" Te$%eratura Te$%eratura e re(*(!* e %r*(es* Te$%eratura Te$%eratura e eser*!!;a(!"
$-- : $--< 5 $ : $-$-- <3- 5 $3- : $--&3- 5 //- :
1- : 1-< 5 ' : 1-< 1-<3- 5 0- : 1-&3- 5 $$- :
13-19 13-12 Des(r!a #a $!(r*estru(tura %rese"te e" u" a(er* 19:9 es%ués e (aa %as* e" #*s s!u!e"tes trata$!e"t*s tér$!(*s. a/ (a#e"tar a 029 / (a#e"tar a 029 (/ (a#e"tar a 029 e/ (a#e"tar a 029 / (a#e"tar (a#e"tar a 029 / (a#e"tar a 029s de calentar c alentar a $(-?:; tanto de ferrita como de perlita. urante el mantenimiento a '-?:; ferrita y perlita permanecen despu>s de enfriar a (?:. 9@# Austenita est= presente despu>s de calentar a $(-?:; bainita despu>s de mantenerse en 0-?:; y la bainita permanece despu>s del enfriamiento. 9:# La austenita est= presente despu>s de calentar a $(-?:; formas de martensita debido a la aplacar. 9# Austenita est= presente despu>s de calentar a $(-?:; formas de ferrita a /(- :, pero toda"ía ueda ueda austenita. urante el apa2ado, la austenita restante restante forma martensita; La estructura final es ferrita y martensita. 9+# La austenita est= presente despu>s de calentar a $(-?:; la ferrita comiena a formarse a /(- :, pero la austenita toda"ía permanece. A 0--?:, la austenita restante se transforma en bainita; La estructura final contiene ferrita y bainita.
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B# La austenita est= presente despu>s de calentar a $(-?:; la ferrita comiena a formarse a /(- :; Parte de la austenita restante se transforma en bainita a 0--?:, pero al2unos la austenita toda"ía permanece despu>s de 1- s; la austenita restante se transforma en martensita durante el apa2ado. La estructura final es ferrita, bainita y martensita 9C# 9C# Auste usteni nita ta est= est= prese present nte e despu> despu>ss de calen calenta tarr a $(-? $(-?:. :. La aust austeni enita ta se transforma en martensita durante el apa2ado. urante el recalentamiento a --?:, la martensita Demperamentos La estructura final es martensita templada. Ebs>r"ese ue el dia2rama DDD no es realmente necesario para esta parte de la pre2unta
13-1+ U"a ?ar!##a e 97: ($ e !@$etr* ' 19 $etr*s e #ar* "* ee sur!r u" a#ara$!e"t* $a'*r e 2 $$ a* (ara7 (ara7 Deter$!"e #a uer;a $@B!$a que %uee a%#!(arse s! #a ?ar!##a est@ 8e(8a e. a/ A#u$!" A#u$!"!* !* / er!# er!#!* !* (/ a"es a"es!* !* S*#u(!". +al51-x1-F' psi +be5 '.x1-F' psi +ma25 0(x1-F' psi !abemos ue 9+5 +sfuero G eformación#ue esto a su "e es i2ual a 9+ 5 B GA6eformación# i=metro 5 -. cm 5 -.1' in 91# B5+A6eformac B5+A6eformación ión eformación5 1-.--(m &1-.---m G 1-.---m 5 -.---( mGm5 -.---(inGin Aplicando la fórmula 1 Bal5 1-x1-F' psi 6 99P*G0#69-.1'in#F(# 6 9-.---(# 5 (/1 ) Bbe5 '.x1-F' psi 6 99P*G0#69-.1'in#F(# 6 9-.---(# 5 1/1) Bma25 0(x1-F' psi 6 99P*G0#69-.1'in#F(# 6 9-.---(# 5 113$ )
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Te$%#a* +l templado es un tratamiento t>rmico ue se emplea para incrementar la durea de las aleaciones de 4ierro 4ierro.. +s tambi>n una t>cnica para aumentar la durea del "idrio "idrio.. Para los metales metales,, temple se realia 2eneralmente despu>s de endurecer, para aumentar la durea, y se realia calentando el metal a una temperatura muc4o m=s baja ue la utiliada para el endurecimiento. La temperatura exacta determina ue durea se alcana, y depende tanto de la composición específica de la alea aleaci ción ón como como de las las propi propieda edade dess dese deseada adass en el produc producto to term termin inad ado. o. Por Por ejemplo, las 4erramientas muy duras a menudo se templan a bajas temperaturas, mientras mientras ue los resortes se templan a temperaturas temperaturas muc4o m=s altas. +n "idrio, "idrio, el templado se realia calentando el "idrio y lue2o enfriando r=pidamente la superficie, para aumentar la durea. tratamiento o complementa complementario rio del temple, ue re2ularmente re2ularmente si2ue Fe?e"!*.+s un tratamient a este. A la unión de los dos tratamientos tambi>n se le llama HbonificadoH. +l re"enido ayuda al templado a aumentar la tenacidad de la aleación a cambio de durea y resistencia, disminuyendo su fra2ilidad. +ste tratamiento consiste en aplicar, a una aleación, una temperatura inferior a la del punto crítico y cuanto m=s se aproxima a esta y mayor es la permanencia del tiempo a dic4a temperatura, mayor es la disminución de la durea 9m=s blando# y la resistencia y mejor la tenacidad. +l resultado final no depende de la "elocidad de enfriamiento. A medida ue se forma martensita durante el templado, las Auste"!ta rete"!a. A placas rodean y aíslan peueIos depósitos de austenita ue se deforman para dar espacio espacio a la martensita martensita de menor densidad. densidad. Al a"anar con la transformación, transformación, no obstante, para ue se formen los restantes depósitos de austenita, la martensita de menor densidad. La martensita martensita circundante circundante debe deformarse. ebido a ue la martensita fuerte se resiste a la transformación, la martensita existente se a2rieta o permanece atrapada en la estructura como austenita retenida, esto es un problema !eria ya ue la martensita se a2rieta y se ablanda durante el re"enido, despu>s del re"enido la austenita austenita se enfría por debajo de Ms y Mr y se transforma transforma en martensita esta da lu2ar martensita re"enida. mple te$%#e arr!a e Ste$%# te$%#ee $arte" $arte"s=t s=t!(* !(* !"!"te !"!"terru rru$%! $%!*/ */.. +l templ martensíticoGtemple escalonado martensítico es una forma de tratamiento t>rmico aplicado como un enfriamiento r=pido interrumpido de aceros, ue se realia normalmente en un baIo de sal fundida, a una temperatura justo por encima de la temperatura temperatura de formación formación de martensita. martensita. +l propósito propósito es demorar demorar el enfriamiento enfriamiento durante determinado período de tiempo, para i2ualar la temperatura en toda la piea. +sto reducir= al mínimo la distorsión, el a2rietamiento y la tensión residual.
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#ue #ue"( "(!a !a ' #a res!s res!ste te"( "(!a !a a #a te"s! te"s!" " que que se *t!e *t!e"e "e" " (*" (*" es esee trata$!e"t* tér$!(*7 S*#u(!". La durea durea de @rin @rinel elll es obten obtenid ida a si el acero acero es enfria enfriado do y ento entonce ncess templado templado a temperatura temperatura debajo de 0$- :, y >l % de elon2ación elon2ación puede puede ser obteni obtenido do si el templa templado do es a una temperat temperatura ura mayor mayor ue 0(- :, por lo tanto un posible tratamiento t>rmico puede ser. Austeniacion a $(- : +nfriar a temperatura ambiente Demplar entre 0(-:y 0$- : +l tratamiento t>rmico de templado y temple tambi>n dar= unJ! de entre 10-, --- y 1'-, --- psi, mientras ue la resistencia a la tensión ser= entre 1-, 1-, ----- y 1$-, 1$-,----. -. Las Las resis resiste tenc ncia iass m=s m=s alta altass se obti obtien enen en para para las las temperaturas de re"enido m=s bajas
/ G Hue res!ste" res!ste"(!a (!a a #a #ue"(!a #ue"(!a ' res!ste"(! res!ste"(!a a a #a te"s!" se *te"r *te"r=a" =a" e" u" a(er* 1909 usa"* e# $!s$* trata$!e"t* tér$!(*7 ?ea ! 12-25
!i un acero 1-$- es templado de de la misma manera el J! ue se encuentra entre 13-, --- y 13,---, y la resistencia a la tensión de 1/-,--- a 1$-,---psi,as resistencias m=s altas se obtienen para las temperaturas de re"enido m=s bajas
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!i el acero 1-- se normaliara sus propiedades serian 1--,--- psi de D! ',--- de J! (-% de elon2ación
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A $-- -: ϒ -.33% -.33% : % ϒ 5 9-.3-& 9-.3-&-.-.-(#G (#G9-. 9-.33 33 8 -.-(# -.-(# 5 -% A /$- : ϒ -.01% -.01% : % ϒ 5 9-.39-.3- &-.-(# &-.-(#G9G9-.01 .01 8 -.-(# -.-(# 5 /(% A /'- : ϒ -.0% -.0% : % ϒ 5 9-.39-.3- &-.-(# &-.-(#G9G9-.0 .08 8 -.-(# -.-(# 5 0% A /0- : ϒ -.'$% -.'$% : % ϒ 5 9-.39-.3- &-.-(# &-.-(#G9G9-.'$ .'$ 8 -.-(# -.-(# 5 0(% A /(/ : ϒ -.//% -.//% : % ϒ 5 9-.39-.3- &-.-(# &-.-(#G9G9-.// .// 8 -.-(# -.-(# 5 3/% La cantidad de austenita 9i2ual a la de la martensita# se representa frente a Demperatura en el 2r=fico. @as=ndose en este 2r=fico, el '-% de martensita se forma cuando la temperatura de austenitiación es de aproximadamente //2rad 2r ados os :. +l co cont nten enid ido o de ca carb rbon ono o de La ma mart rten ensi sita ta u ue e se fo form rma a es de aproximadamente -,0$% de :. La te temp mper erat atur ura a A3 de dell ac acer ero o es de ap apro roxi xima mada dame ment nte e $$- 2r 2rad ados os :. Mn tratamiento t>rmico adecuado podría utiliar una temperatura de austenitiación de aproximadamente $- 2rados : < 2rados : 5$'- 2rados :.
11-22 U"a U"a %!e;a %r*u(!a e u" a(er* e aa a#ea(!" ' 972 972 e C !ura 13-1:/ t!e"e u"a $!(r*estru(tura es%ués e te$%#ar#a7 ¿Hué $!(r*estru(tura se *te"r@ s! se usa u" a(er* 1909) ¿Hué $!(r*estru(tura se *te"r@ s! se usa u" a(er* +3+9)
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13-26 Se 8a e"(*"tra* que u" a(er* 1959& (ua"* se auste"!t!;a a 5:9
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/ 1909
S*#u(!". :on base en el dia2rama de endurecimiento, nos damos cuenta ue a# Para Para el acero 030- la durea durea siempre siempre es mayor mayor ue el ran2o especi especific ficado ado.. Por tanto no es adecuado. b# Para el el acero $'0- con con una distancia distancia de de Qominy Qominy de 1$G1' 1$G1' a (-G1' (-G1' podemos alcanar la durea deseada. :on esta distancia de Qominy podemos "er ue la tasa de enfriamiento debe ser de 3 a 0 :Gs. c# Para Para el acero acero 31- una dista distanc ncia ia de Qomi Qominy ny de 1-G1' 1-G1' a 1(G1' 1(G1' nos nos da la durea deseada. :on esas distancias nos damos cuenta ue la tasa de enfriamiento es de $ a 1-:Gs d# Para Para el acer acero o 03(03(- una dist distan anci cia a de Qomin Qominyy de 'G1' 'G1' nos nos da la dure durea a deseada. :on esa distancia nos damos cuenta ue la tasa de enfriamiento es de ((:Gs
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a# La rapide de enfriamiento en ese lu2ar S*#u(!".
Para obtener RS: en un acero 03(-, debe de ser de 1':Gs, correspondiente a un 2rado de enfriamiento de 1':Gs b# La microestructura y durea ue se obtendría si la piea se 4iciera de acero 1-$-.
S*#u(!". !i el 2rado de enfriamiento si2ue a 1':Gs de un dia2rama ::D para el acero, esta parte contendr= perlita con una durea de R:S 3$.
13-32 ¿Cua#es s*" a#u"as a%#!(a(!*"es e ) +l Tolframi Tolframio o dada dada su durea y capacid capacidad ad para soportar soportar el calor calor,, el Tolfram Tolframio io resulta resulta ideal como componente esencial en 4erramientas 4erramientas de corte utiliadas utiliadas para perforar, prensar o cortar otros metales, 4ormi2ón o roca 9brocas para bricola2e, 4erramientas metalúr2icas o instrumental odontoló2ico, etc.# Cracias a estas características, las aleaciones de Tolframio tambi>n son idóneas para para comp compone onent ntes es crít crític icos os de maui mauina naria ria,, term termos osen ensi sibl bles es y resi resist sten ente tess al des2aste 9"=l"ulas de motor, palas de turbinas, puntas de bolí2rafo o tacos de neum=ticos de nie"e, etc.# !u resistencia al calor y al des2aste, junto a su conducti"idad el>ctrica, 4acen ue el Tolf Tolfram ramio io sea sea perf perfec ecto to como como compo componen nente te term termorr orresi esist sten ente te en apara aparato toss electrónicos y como punto de contacto en circuitos el>ctricos 9pantallas L:, tubos de DU, DU, impresoras l=ser, lunetas t>rmicas, bocinas de "e4ículos "e4ículos o conmutadores conmutadores
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13-3+ U"a arra e a(er* se 8a e te$%#ar e" aua (*" a!ta(!"7 Deter$!"e e# !@$etr* $@B!$* e #a arra que %r*u(!r@ u"a ure;a $="!$a e DFC +9 s! #a arra es e a(er* a/19:9 /1909 (/+329 /06+9 e/+3+9 a# Acero 1-- +l coeficiente R para el a2ua a2itada es 0,-. Para el 1-- Acero, la distancia distancia de Qominy debe ser de al menos 3 1' pul2adas para producir la durea. Por lo tanto, el di=metro m=ximo ue permitir= esto es de 1,3 pul2. b# Acero 1-$- A4ora la distancia de Qominy debe ser por lo menos 1' pul2adas, con el mismo coeficiente R. +l di=metro m=ximo permitido es 1, pul2. c# Acero 03(- La distancia mínima de Qominy es de 1' pul2adas, y el m=ximo di=metro de la barra es 1, pul2. d# Acero $'0- La distancia mínima de Qominy es de 1$ 1' pul2. Por consi2uiente, las barras con un di=metro m=ximo de a lo muc4o (, pul2adas producir= la "elocidad de enfriamiento deseada y la durea. e# Acero 030- @arras con un di=metro m=ximo de muc4o m=s de (, pul2.
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13-+2 ¿Hué es u" a(er* !"*B!a#e) ¿P*r qué s*" !"*B!a#es #*s a(er*s !"*B!a#es) +s un acero resistente a la corrosión. Porue contienen un mínimo de alrededor de 11% de :r, lo cual permite ue se forme una capa del2ada y protectora de óxido de cromo cuando el acero se expone al oxí2eno, esto e"ita la corrosión.
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13-+++ De $a"e 13-+ $a"era ra *(as *(as!* !*"a "a#& #& (ua" (ua"* * se sue# sue#a a u" a( a(er er* * !"*B !"*B! !a a#e #e auste"=t!(*& e# e%s!t* e s*#aura %uee ser #!era$e"te $a"ét!(*7 C*" ase ase e" e# !a !ara ra$a $a e ase asess e e-C e-Crr-N! N!-C -C M! M!ur uraa 13 13-2 -20 0& &¿q ¿qué ué ase ase es%erar=a uste que esté (ausa"* e# (*$%*rta$!e"t* $a"ét!(*) ¿P*r qué %*r=a 8aerse *r$a* esta ase) ¿Hué %*r=a 8a(erse %ara resta#e(er e# (*$%*rta$!e"t* "* $a"ét!(*) Los aceros inoxidables austeníticos, comp compara arado doss con con otra otrass fami famililias as de acero aceros, s, como los aceros al carbono sin alear, los de baja aleación o incluso comparados con las otra otrass fami famililias as de acer aceros os inox inoxid idab able les, s, son son acero aceross ue ue tien tienen en un punt punto o de fusi fusión ón m=s m=s bajo, su estructura interna ofrece una mayor resistencia el>ctrica con menor conducti"idad t>rm t>rmic ica a y prese present ntan an,, en 2ene 2eneral ral,, un mayor mayor coeficiente de dilatación ue los dem=s aceros. +l param parama2 a2net netis ismo mo es la tend tenden enci cia a de los los momentos ma2n>ticos libres 9espín u orbitales# a alinears arse paralelamen amentte a un camp campo o ma2n ma2n>t >tic ico. o. !i estos estos mome moment ntos os ma2n ma2n>t >tic icos os
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13-+6 C*$%are C*$%are #as te$%eratura te$%eraturas s euté(t!(as euté(t!(as e #a u"!(!" u"!(!" e-+73C e-+73C ' e376C-271S!7 ¿Hué a#ea(!" se es%era que sea $as $aqu!"a#e ' %*r qué) La fundición Be&0.3%: es demasiado dura para ser mauinada, sin embar2o se puede tratar t>rmicamente para producir un VVductile or nodular cast iron77 . +l tratamiento causar= ue 2rafito esf>rico creca durante la solidificación. +ste acero tiene excelente resistencia y 2ran ductilidad. La aleación Be&3.'%:&(.1%!i al tener menor cantidad cantidad de carbono es m=s f=cil de mauinar. Adem=s contiene !i ue actúa como c omo reductor de : y estabiliador. Por tanto concluimos ue es m=s f=cil de mauinar ue la aleación Be&3.'%:& (.1%!i 13-+07 Se e"(ue"tra que u"a arra e u"a %!e;a (*#aa e 8!err* r!s (#ase +9 t!e"e u"a res!ste"(!a res!ste"(!a a #a te"s!" te"s!" e :9 999 %s!7 ¿P*r qué #a res!ste"(! res!ste"(!aa a #a te"s!" es $a'*r que #a aa %*r e# ",$er* e (#ase) ¿Cu@# %!e"sa uste que es e# !@$etr* e #a arra e %ruea) Primero sería un di=metro c4ico ya ue, en pieas coladas del2adas, el 2rafito y la perlita forman y dan resistencia a la tensión m=s alta.
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¿Cu@# ¿Cu@# es #a (a"t!a (a"t!a $="!$a $="!$a e !ts !ts que ee te"er te"er e# re!s re!str* tr* !"a !"ar!* r!* %ara %ara que que e# s! s!st ste$ e$aa e (*" (*"u( u((! (!" " $e(@ $e(@"! "!(a (a se (*"? (*"?!er !erta ta e" e# (*$%*"e"te #!$!ta"te e" #a res*#u(!" e (*"tr*#)
atos P5/. mm )s5( )s5(- pas pasos osGGre" re" @5 1( bits L5-- mm a# 7.5
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b# ) 5
J f p5
( r g )∗( f r )
( f r )∗( ns ) 60∗ p
p
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( 30 )∗( 240 ) f p5 5 (- R 60∗6
3476 La $esa 3476 $esa e %*s! %*s!(! (!*" *"a$ a$!e !e"t "t* * %ara %ara u"a u"a $@qu $@qu!" !"aa e !"se !"ser( r(! !" " e (*$%*"e"tes usa u" $*t*r e e"ra"es ' u" $e(a"!s$* e t*r"!##* u=a7 Las es%e(!!(a(!*"es e !seJ* requ!ere" u"a ?e#*(!a e $esa e +9 !"$!" !"$!" ' u"a %re(!s!" %re(!s!" e 979990 979990 !"7 E# %as* e# t*r"!# t*r"!##* #* u=a e 972 !"& ' #a ra;" e e"ra"es es e 2.1 2 !r*s e# $*t*r %*r 1 !r* e# t*r"!##* u=a/7
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x∗ns n p = p
Pero como el codificador en este caso est= conectado al eje del motor tenemos entonces ue n p =
r g∗ x∗ns p
Los datos ue nos brinda el problema son r 2 9raón de en2ranes# 5 1' Z 9distancia de mo"imiento de la mesa# 5 1--mm ns 9ranuras en el disco# 5 (-- pulsosGre" p 9paso# 5 mm
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%ara resa* %*r CN7 E# t*r"!##* qu=a t!e"e : r*s(as!"7 E# (*!!(a*r %t!(* (*"e(ta* a# t*r"!##* u=a e$!te 199%u#s*sre? e# t*r"!##* u=a7 E# $*t*r !ra a u"a ?e#*(!a $@B!$a e 099 re?$!"7 Deter$!"e a/ #a res*#u(!" e (*"tr*# e# s!ste$a& eB%resaa e" #a !sta"(!a e ?!ae #!"ea# e# ee e #a $esa& / #a re(ue"(!a e# tre" e %u#s*s que e$!te e# (*!!(a*r %t!(* (ua"* e# ser?* $*t*r *%era a $@B!$a ?e#*(!a ' (/ #a ?e#*(!a e ?!ae e #a $esa a #as r%$ $@B!$as e# $*t*r7 9a# p5 paso ns5cantidad de ranuras en el disco pGns 5 -.(G1-- 5 -.--( in 9b#f p5frecuencia del tren de pulsos "elocidad de motor fp 5
Nns 60
5 $--91--#G'- 5 1333.3 R
ns5cantidad de ranuras en el disco
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e (*rte es e 39 $$!" ' #a (ara e %ast!##a e 9796$$7 E# eBtre$* (*rta*r e resa* t!e"e 2 !e"tes ' su !@$etr* es e$1679 $$7 E# ee B usa u" ser?*$*t*r e (*rr!e"te !re(ta (*"e(ta* !re(ta$e"te a u" t*r"!##* u!@ (u'* %as* es e 679 $$7 E# !s%*s!t!?* se"s*r e retr*a#!$e"ta(!" es u" (*!!(a*r %t!(* que e$!te +99 %u#s*sre?7 Deter$!"e a/ #a ?e#*(!a e a#!$e"ta(! a#!$e"ta(!" " ' e# t!e$%* %ara ter$!"ar e# (*rte ' / #a ?e#*(!a ?e#*(!a e r*ta(!" r*ta(!" e# $*t*r ' #a ra;" e %u#s*s e# (*!!(a*r a #a ?e#*(!a e a#!$e"ta(!" !"!(aa7 !olución 9a# velocidad d motor 5 93- x 1-3 mmGmin#G91'\ mmGre"# 5 '.$ re"Gmin '.$9-.-'# velocidad de alimentación 5 9velocidad d motor # (carga) n(dientes) 5 '.$9-.-'# 9(# velocidad de alimentación 5/1.'( mmGmin Tiempo de corte 5 3(G/1.'( 5 0.0 min
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1171+ ¿P*r qué se *r$a" #*s %re(!%!ta*s e"era*s %*r e# e"ure(!$!e"t* %*r %re(!%!ta(!" a t** #* #ar* e #a $!(r*estru(tura ' "* s*#* e" #*s #=$!tes e ra"*) +l endurecimiento por precipitación es un tratamiento tratamiento t>rmico para endurecer, es decir, aumentar de la durea y la resistencia de las aleaciones. !e basa en la deposición de fases metaestables en forma finamente di"idida, de modo ue forma una barrera efica contra los mo"imientos de las dislocaciones. Los precipitados precipitados se 2eneran 2eneran tambi>n tambi>n a lo lar2o de la microestructura microestructura ya ya ue las dislocaciones conformen se deslian "an endureciendo el material a su paso
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La reacción perit>ctica de la aleción se da a los /$-:. La temperatura de sol"us para :u&1.(% @e es 3-:, por tanto podmos calentar la aleación entr entre e 3- 3-: : y /$- /$-: :
y lue2 lue2o o enfr enfria iarl rla a rapi rapida dame ment nte e para para atra atrapa par r
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Uɵ5
( ) 4 π 3
( 4.5 x 10
−5
cm)
3
− 15
=382 x 10
0.0182 c m
cm
3
3 10
4.76 x 10 particulas particulas
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estructura es una solución solida sobresaturada y no es una estructura en euilibrio sino una estructura metaestable.
Pas* Pas* 3. E"?ee E"?ee(!$ (!$!e" !e"t*7 t*7 La solución supersaturada se calienta a una
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contra los mo"imientos de las dislocaciones. La resistencia a la fluencia de las aleaciones así tratadas puede aumentar 4asta 3-- pa.
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c A&%@ La fase _ casi toda est= formada. +speramos ue la aleación A&% @ sea demasiado fr=2il.
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