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Strain-Induced Precipitation in a Multi-microalloyed Steel YUAN Shaogiang'YANG Shanwu WU Huibin,WANG Xuemin HE Xinlai 1)Materials Science and Engineering School,University of Science and Technology Beijing.Beijing 100083,China 2)Tangshan College,Tangshan 063000,China ABSTRACT Transmission electron microscopy (TEM)and nanobeam EDS technique were used to investigate the strain induced precipitation behavior during relaxation process after deformation in the non-recrystallization temperature range of a ultra-low carbon steel containing Nb,Ti and Mo.The experiment results indicate that after 30%predeformatin at 850'C and 900C,two kinds of precipitates,combination of Nb and Ti and a few pure Nb,oc- cur in the steel during isothermal holding.The atomic ratio of Nb to Ti in particles increased and pure Nb particles disappeared with the relaxation extended.After longer holding,some Nb and Ti atoms in the lattice sites of the pre- cipitates were replaced by Mo atoms.The content of Mo in the precipitates rised with the relaxation time increased. The shape of the precipitates is mainly irregular and the density and average size of precipitates are related to de- formation temperature and relaxation time KEY WORDS microalloyed steel;stress relaxation:strain induce precipitation4 18 北 京 科 技 大 学 学 报 2 00 3 年 第 5期 3 结 论 ( l) 含 Nb , iT , M o 的多 元微 合 金实 验钢 变 形后 的应 力 弛豫过 程 分为三 个 阶段 , 分 别对应 析 出相 的形 核 、 长 大 与粗 化 过程 . (2 )沿 大量 变 形 位 错 的扩 散 在 析 出物 的长 大 过 程 中特 别 是 长大 初 期起 重 要作 用 . (3 )析 出颗 粒 的长 大伴 随着成 分 的变化 , 析 出 颗 粒 在生 长初 期 富 iT , 随着 颗 粒 的长 大 , Ti入b 逐 渐 减 小 , 变成 以Nb 为主 , 并有 M o 进入 析 出相 中 . 参 考 文 献 H o n g S G , K an g K B , P a rk G G . Satr i n 一 i n d u e e d P r e e i Piat - ti o n o f N b i n N b an d N b 一 iT m i e or a l l o y e d H S L A s t e e l s [ J] . S e r i Pt a M at e r, 2 0 0 2 , 4 6 : 16 3 D u t t a B , S e ll ar s C M 二 E fe e t o f e o m P o s i ti o n a n d P r o e e s s v a r i a b l e s o n N b (C , N ) Per e iP i t at i o n i n n i o bi u m m i e or a l - l o y e d a u s t e n i t e [J] . 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I S IJ int , 1 9 9 2 , 3 2 ( 3 ) : 2 8 3 S tr a i n 一 I n d u e e d rP e e iP it at i o n i n a M u lt i 一 m i c r o a ll o y e d S t e e l 了乙月N hS a o q ia ng , , 2 ), YA 入 . G hS a n w u , ), 砰 尸 U H盼i b’ln ’ ,) 洲刃 6 Xu e脚’ ln ’ ), H石 , 人公王la i , , l ) M at e r i a l s s e i e n e e an d E吧i n e e r in g s e h o o l , U n i v e rs ity o f s e i e n e e an d eT e hn o l o 罗 B e ij i嗯 , B e ij i n g l 00 0 8 3 , C h i n a 2 ) T a n g s h a n C o ll e g e , 几 n g sh an 0 6 3 00 0 , C h in a A B S T RA C T rT an sm i s s i o n e l e e tr on m i e or s e o P y ( T E M ) an d n an ob e am E D S t e e h n i q u e we r e u s e d t o i vn e st i g at e ht e s atr i n i n d u e e d P re e i P iat it on b e h a v ior d而 gn re lax a t ion P r o e e s s a ft e r d e of rm at ion i n ht e n o n 一 re e ry s at lli z at ion t e l n P e r a t u r e r a n g e o f a u ltr a 一 l o w e arb o n s t e e l e o in a i n ign Nb , T i an d M o . T h e e x P e r im e in er s u it s i n d i e aet th a t a fet r 3 0% P r e d e fo mr at i n at 8 50 oC an d 90 0℃ , wt o k i n d s o f P r e e i P itat e s , e o m b i n at ion o f Nb an d iT an d a fe w Pur e 确 , o e - e ur i n th e s t e e l d u r i n g i s o ht e mr a l ho l d ign . T h e at om i e art i o o f Nb t o iT i n P a rt i c l e s icn er a s e d a n d P u r e Nb P art i e l e s d i s ap P e ar e d w i ht ht e r e l ax at i o n e x t e n d e d . A ft e r l o gn e r h o ld ign , s o m e Nb an d T i at om s in ht e lat i e e s it e s o f het P er - e i Pi t at e s w e r e er P l a c e d b y M o at o m s . hT e e o n t e n t o f M o i n ht e Per e i P i at et s ir s e d iw ht het er l ax at i o n it m e i n e er as e d . hT e s h aP e o f ht e P r e e i Pi t at e s 1 5 m a i n ly ier g u l ar an d ht e de n s i yt a n d va e r ag e s i z e o f P r e c i Piat e s aer er l aet d t o d e - fo mr a t i o n t e m P e r a t u r e an d er l ax at i o n t im e . K E Y W O R D S m i e r o a l loy e d s t e e l: s etr s s er l ax at i o n : s tr a i n in d u e e P r e e iP it at i o n