Development of high strength low alloy TRIP-aided steels with ultra fine grain

被引:1
作者
Sugimoto, K
Hayakawa, A
Hashimoto, S
Ikeda, S
机构
[1] Shinshu Univ, Dept Mech Syst Engn, Nagano 3808553, Japan
[2] CBMM Asia Co Ltd, Ferrous Dept, Minato Ku, Tokyo 1070052, Japan
[3] Kobe Steel Ltd, Mat Res Lab, Nishi Ku, Kobe, Hyogo 6512271, Japan
来源
THERMEC'2003, PTS 1-5 | 2003年 / 426-4卷
关键词
thermomechanical processing; hot forging; TRIP-aided steel; high strength steel; microstructure; retained austenite; annealed martensite; ultra fine grain;
D O I
10.4028/www.scientific.net/MSF.426-432.1469
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effects of thermomechanical processing and prior structure on microstructure and retained austenite characteristics of high-strength low alloy 0.20C-1.5Si-1.5Mn TRIP-aided steels were investigated to enhance the workability limit. Ultra fine polygonal ferrite grain of I to 2mu m in diameter were completed inside prior martensite lath structure adjacent to interlath retained austenites in the steels with a prior structure of martensite single phase which were subjected to 30-50% reduction at intercritical annealing temperatures between 760 and 820degreesC, followed by austempering at 375-450degreesC for 100 seconds. Under the same processing conditions, volume fraction of retained austenite was significantly increased with a small decrease in its carbon concentration. It was found in the steels that relatively thick austenite plates recrystallized during intercritical annealing suppressed the migration of prior martensite lath boundary and the resultant grain growth of recrystallized polygonal ferrite. Also, It was confirmed by EBSP analysis that a difference in orientation between the ultra fine polygonal ferrite grains was relatively large.
引用
收藏
页码:1469 / 1474
页数:6
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