NiTi形状记忆合金的氢致表面损伤
Hydrogen-induced Surface Damage of NiTi Shape Memory Alloy
摘 要
研究了近等原子比NiTi形状记忆合金在阴极充氢后时效过程中表面的相变与破坏,认为时效裂纹的产生与奥氏体不锈钢类似,为氢释放和氢致马氏体分解导致表面收缩产生较大张应力所致,时效过程中裂纹扩展持续时间超过5天.氢致马氏体微观形貌与应力诱发马氏体相似,二者形貌上不可区分.氢化物与基体的界面和氢致马氏体与奥氏体相界面在时效过程中可能成为裂纹源.
氢致裂纹
氢致马氏体
氢化物
NiTi alloy
hydrogen-induced crack
hydrogen-induced martensite
hydride
Abstract
The phase transformation and damage at the surface of near-equiatomic NiTi shape memory alloy were investigated.The results show that similar to ustenitic stainless steel the generation of crack on the surface of NiTi alloy during the aging at room temperature after hydrogen electro-charging is related to the surface stress produced from the hydrogen release and the reducing of hydrogen induced martensite.The growth of crack lasted for more than 5 days.The morphology of stress-induced martensite and hydrogen-induced martensite is similar and could not be distinguished.The interface between hydride and base alloy and the interface between hydrogen-induced martensite and the austenite alloy could be the crack source.
中图分类号 TG172
所属栏目 试验研究
基金项目 上海市教委创新基金项目(09YZ28)
收稿日期 2008/12/15
修改稿日期 2009/1/9
网络出版日期
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备注程晓英,副研究员.
引用该论文: CHEN Hong-yuan,CHENG Xiao-ying. Hydrogen-induced Surface Damage of NiTi Shape Memory Alloy[J]. Corrosion & Protection, 2009, 30(9): 636～640
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参考文献
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【7】褚武扬,肖纪美,李世琼.钢中氢致裂纹机构研究[J].金属学报,1981,17(1):10-17.
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【11】高佩钰.氢在Cr18Ni8不锈钢中的作用[J].金属学报,1979,15(3):323.
【12】高学榕,李继森,刘沃恒.稳定奥氏体不锈钢的氢脆[J].中国腐蚀与防护学报,1984,4(3):213-217.
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