压力容器Issue(7)：1-7,7.DOI:10.3969/j.issn.1001-4837.2015.07.001
应变强化对 S30408奥氏体不锈钢低温冲击性能的影响
Effects of Strain-strengthening on Impact Property of S30408 Austenitic Stainless Steel at Cryogenic Temperature
摘要
Abstract
The yield strength of austenitic stainless steel could be increased by strain-strengthening at room temperature.Stain-stretching technique can reduce the wall thickness of vessel,and has been widely used in austenitic stainless steel cryogenic vessel.The effect of strain-strengthening on impact property of S30408 austenitic stainless steel was investigated by using optical microscopy,X-ray diffraction,transmission electron microscope and pendulum impact testing machine.The results show that α′-and ε-martensite phase were strain-induced during the strain-strengthening.The effect of microstructure and volume percent of phase on materials after stain-stretching was small.The impact absorbed energy(KV2 )decreased with increasing deformation and temperature drop.The crack propagation energy EP is almost unchanged,but its crack initiation energy Ei showed a similar trend with the total KV2 .When the temperature was lower than 77 K,the decreasing of impact absorbed energy tended to be smooth,and showed a “platform”phe-nomenon.The effect of strain strengthening on cryogenic impact property of materials is greater than the effect of cryogenic temperature.Even after strained 15%,the material was still showing a greater low tem-perature impact toughness.关键词
应变强化/奥氏体不锈钢/马氏体相变/低温冲击性能Key words
strain-strengthening/austenitic stainless steel/martensitic transformation/impact property at cryogenic temperature分类
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孔韦海,陈学东,陈勇,陆戴丁..应变强化对 S30408奥氏体不锈钢低温冲击性能的影响[J].压力容器,2015,(7):1-7,7.基金项目
安徽省自然科学基金项目（1308085ME69）；安徽省重大科学仪器设备开发专项（1310115194）；合肥通用机械研究院青年科技基金 （）
