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RECRYSTALLIZATION-INDUCED PLASTICITY IN 18Ni MARAGING STEEL UNDER ELASTIC STRESS

YIN Zhongda Harbin Institute of Technology , Harbin , China ZHOU Yongkang Shanghai Centrifugal Machinery Research Institute , Shanghai , China YIN Zhongda Faculty of Heat Treatment of Materials , Harbin Institute of Technology , Harbin 150006 , China

金属学报(英文版)

An approach to study the recrystallization-induced plasticity(RIP)phenomenon in the 18Ni maraging steel under the elastic stress has been made by the analysis of dynamic behaviour at elevated temperatures,the phenomenological analysis of dynamic strain feature curves,the confirmation of phase transformation point and TEM observation of RIP processing itself.

关键词: elastic stress , null , null , null

TRANSFORMATION INDUCED SUPERPLASTICITY IN 18Ni MARAGING STEEL

YIN Zhongda Harbin Institute of Technology , Harbin , ChinaZHOU Yongkang Shanghai Centrifugal Machinery Research Institute , Shanghai , China

金属学报(英文版)

After exploring the influence of stress,cold-rolling reduction and cooling rate on transforma- tion induced strain,the transformation induced superplasticity forming technique of the 18Ni maraging steel(2450 MPa)was developed.Through 14 times γα′ cyclic transformation,the limited elongation of 320% can be obtained in 60% cold-rolled specimen.TEM observation revealed that the morphology of stress induced martensite is massive.

关键词: maraging steel , null , null

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