Effect of strain-induced martensite on hydrogen environment embrittlement of sensitized austenitic stainless steels at low temperatures
Effect of strain-induced martensite on hydrogen environment embrittlement of sensitized austenitic stainless steels at low temperatures
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DOI：
10.1016/s1359-6454(98)00136-0
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发表时间：
1998-08-10
期刊：
影响因子：
9.4
通讯作者：
Yokogawa, K
中科院分区：
文献类型：
--
作者：
Han, G;He, J;Yokogawa, K
研究了304、316和310 S奥氏体不锈钢经固溶退火、敏化和脱敏热处理后，在295 ~ 80 K温度范围内，在1 MPa氢气和氦气中的氢环境脆性。研究了应变诱发马氏体和碳化物对热弹性效应的影响。应变诱发马氏体和碳化物都沿着晶界存在于敏化材料中。304和316型亚稳奥氏体不锈钢显示出相当大的HEE，但310 S型稳定奥氏体不锈钢不受氢环境的影响。304型和316型不锈钢的热膨胀系数取决于测试温度，最大热膨胀系数发生在220 K左右，与热处理类型无关。材料对HEE的敏感性通过敏化而增强，敏化引起沿晶断裂，并且在从沿晶断裂过渡到穿晶断裂时由于减敏而恢复。应变诱发马氏体与碳化物一起被观察到，两者都沿着敏化材料的晶界。作为减敏的结果，抑制了沿晶界沿着马氏体的形成。结果表明，敏化材料的热膨胀效应不是由碳化物引起的，而是由沿晶界沿着的应变诱发α '马氏体引起的。(C)1998年冶金学报由爱思唯尔科技有限公司出版。保留所有权利。
Hydrogen environment embrittlement (HEE) of the austenitic stainless steels of types 304, 316 and 310S with the solution-annealed, sensitized and desensitized heat treatments was investigated in hydrogen and helium of 1 MPa in the temperature range from 295 to 80 K. The effect of the strain-induced martensite, distinguished from that of the carbides, both existing along the grain boundaries in the sensitized materials, on HEE was examined. Metastable austenitic stainless steels of types 304 and 316 showed considerable HEE, but stable austenitic stainless steel of type 310S was not affected by the hydrogen environment. HEE of types 304 and 316 stainless steels depended on the testing temperature, and the maximum HEE occurred at around 220 K independent of the type of heat treatment. The susceptibility of the materials to HEE was enhanced by the sensitization, that caused intergranular fracture, and was recovered upon a transition from the intergranular fracture to the transgranular fracture due to desensitization. The strain-induced martensite was observed together with the carbides, both along the grain boundaries of the sensitized materials. As a result of desensitization, the formation of martensite along the grain boundaries was inhibited. It was evident that HEE of the sensitized materials was not due to the carbides, but to the strain-induced alpha' martensite along the grain boundaries. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.