EFFECT OF PRE-COLD-WORKING ON DIFFUSIONAL REVERSION OF DEFORMATION-INDUCED MARTENSITE IN METASTABLE AUSTENITIC STAINLESS-STEEL

被引:127
作者
TAKAKI, S
TOMIMURA, K
UEDA, S
机构
[1] NISSHIN STEEL CO LTD,STEEL RES & DEV LAB,YAMAGUCHI 746,JAPAN
[2] HITACHI MET LTD,MOKA,TOCHIGI 32143,JAPAN
关键词
AUSTENITIC STAINLESS STEEL; PRE-COLD-WORKING; DEFORMATION INDUCED MARTENSITE; DIFFUSIONAL REVERSION; LATH-MARTENSITIC STRUCTURE; DISLOCATION-CELL; GRAIN BOUNDARY STRENGTHENING;
D O I
10.2355/isijinternational.34.522
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Metastable austenitic stainless steels undergo deformation induced transformation to bcc martensitic structure during cold-working. The martensite induced reverts to austenite at a relatively low temperature and this leads to the formation of ultra fine austenite grains of less than 1 mum in diameter. In this paper, the effect of pre-cold-working on the morphology of reversed austenite was investigated by means of transmission electron microscopy and tensile test. The alloy used is an Fe-18.08%Cr-8.65%Ni alloy. Since this alloy has metastable austenitic structure at room temperature, it almost transforms to lath-martensite by 50% cold-rolling. Further cold-rolling above 50% deforms transformed martensite itself, and results in the formation of dislocation-cell structure instead of lath-martensitic structure. The diffusional reversion of deformation induced martensite takes place at around 900 K and pre-cold-working to lath-martensite not only promotes the reversion but also gives a large effect on the microstructure of reversed austenite: Reversed austenite is characterized, in a specimen with 50% pre-cold-working, by the stratum structure of austenite laths and blocks, which looks like a lath-martensitic structure, while in a specimen with heavy pre-cold-working, by the structure of fine equiaxed grains. On the discussion of grain boundary strengthening in the former case, 0.2% proof stress depends not on the lath size but on the block size of reversed austenite.
引用
收藏
页码:522 / 527
页数:6
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