A study of the early stages of tempering in an Fe-1.2 Pct alloy
- PDF / 3,119,743 Bytes
- 13 Pages / 612 x 792 pts (letter) Page_size
- 84 Downloads / 206 Views
,Stages of Tern peal
Fet" ~LiG;;Q:
,in an
" ,?jt~
i~-[~ [~:'~}~ :'i;: ~"3(:;Y,.',~':~ : : S ; ' ~
/':;;~J
)
'.~,.)~;~' : ~ : ~
:,
-"',
...... ~
"
: . . . . . . -. . . . . . . .
:~ '
~ ~"~
~-~-~"
...............
,,-~
. . ~oshb~ale_r effe,ct l ~ r ~ i ~ i ~ ~ s b ~ e i i i ~ e d to studl,=,iii= , 'l,=il,llclil=if.y'.. ..............11.........'.]1 ~ i:lii'e2iiiiw:[!ict':'t=iliil ili"i#te'~iiiiig bSiween 3 '$~'~i~tii 5 - ' : i ' . ~ "i '0:-'5i ~,':'" .~.-~:,;,~i ::,i i :; _,~!,~,=>a=;, , t r a n s m o n carbade, ' : t ! ! ~ i ! ~ was Talent{fled t I 'transmms'lor~'iYietron'mai~o~cbt~-iiit the ............ .................. 81mllarlty of ! - l a r b l t i elec[r0h dfffracti01 ~atterns to r/-Paa'bld~i d f f ~ f l t l o n patterns ~s -= ' ' .... rioted. SySfe~t~i:C i I ~ n ' i e i ~ f l / t t i t ~ 'of m a / t e n s i f " a n d : a u s t i n t t e ' t - g e ..... ' .........~ ,~.......~,.;:-~:1 p r e s e n t i t tbr the l i i 0 i s g t i ~ e s - ' 0 ~ " t i m p e r ~ g ; The Sa-fia'e a t o u n t ' o f C r e ~ a i n s ' r a O }y...... ,::'................. ~..... dissolved in the retained austenite throughout t e m p e r i n g and s o m e C is retained in the m a r t e n s i t e throughout the range of transition carbide f o r m a t i o n . Two sets of M h s s b a u e r p a r a m e t e r s c o r r e s p o n d i n g to magnetic phases other than m a r t e n s i t e and cementite have ............ bee--n-f~-un-d-:`~These-pa-r-a.`meters~m~.~me f r ~ m ~]carbide~ but~a~ternate~inter~retati~ns ......................................... are p r e s e n t e d . . . . . . . . . . . . . . . . . . . . .I. . . . .INTRODUCTYON ............... ~ ~ THE early st~ ~ temperin~ i ~ w h i c h tr~msitio~ 9 - :................... :.. ......................................... in F e - C alloys and steels have been followed by metall ~ r a p h i c , X - r a y , d i l a t o m e t r i c , res'is~omet~'~6 ~, stre's~:r~!axation , and mechanical testing teehni~i~e~S::~-7 ~ S bauer effect s p e c t r o s c o p y (MES) has been-a'ppiied ~ ' a n u m b e r of studies of m a r t e n s i t i c ~al,loys,SZ~6~.lmt the p u r pose of most s-e~ of these e x p e r i m e n t s was p r i m a r i l y to e v a l u a t e ~ t ~ t t ~ r e 6~-as~q~nehed mart~ns~te and au~tenite and th~ carbgn , a t o ~ r e a r r a n g e m e n t that p r e - . . cedes c b~de formah~..,::~A>~ew studies ~:~,h~tve Concentrated on transition carbide formatior~ due~ to tem~ The t e m p e r i n ~ sta~es of::cOncern in this investigation 9 ~.~j ~f~! ~;~d,-~ 0!!:)R'~v~' ~i,:q,i! ,-%,~ {{ Y~ (i i ( ~ ? "c (). include the ~teve~opm~tit Oftlie tra~!S~tionc~b!de, the r e p l a c e m e n t of the t r a n s i t m n carbide by cementite EeZC, and~,the::transformaf~on:.Of retai~aed at~s~enite th[tt o c c u r s c o n c u r r e n t l y with t h e t6r.mati:0/r of the!c.'a,rbides in the m a r t e n s i t e . J a c k z7 identified the t r a n s i txpn carbide which f o r m s during t e ~ p e r m g ~ b e t w e e n ..... 350 and 430 K as hexagonal epsilon (e)-cdr~ide. The e~carbide has a Cur
Data Loading...
