20MnNiMo钢焊接氢致裂纹特征(Ⅱ)  

Hydrogen-Induced Cracking Feature of steel 2OMnNiMo

作　　者：张显辉[1] 焦伟[1] 谭长瑛[1] 

机构地区：[1]哈尔滨焊接研究所,哈尔滨150080

出　　处：《焊接学报》2002年第3期23-25,共3页Transactions of The China Welding Institution

基　　金：国家科委攀登B计划预选项目 ;机械工业技术发展基金资助项目 ( 95JA0 40 6 )

摘　　要：采用插销试验法研究了扩散氢含量和焊接冷却速度 (t8/ 3 )对 2 0MnNiMo钢焊接氢致裂纹产生的影响 ,并采用扫描电子显微镜观察了氢致裂纹断口形貌。结果表明 ,2 0MnNiMo钢焊接氢致裂纹的产生与扩散氢含量有很强的依赖关系。在低氢条件下 ,氢致裂纹产生需要较高的拘束应力 ;而在高氢条件下 ,只要很小的应力便可诱发氢致裂纹的产生。在相同扩散氢含量条件下 ,热影响区韧性越好 。In this paper the effects of diffusible hydrogen content and cooling rate (t 8/3 ) on hydrogen-induced cracking ( HIC) of steel 2OMnNiMo have been investigated by implant teat ,and the fractography of implant is observed by scanning electron microscope ( SEM). The experimental results show that HIC of steel 2OMnNiMo is relative with diffusible hydrogen content strongly. At low hydrogen level, high restrain stress is needed to nucleate HIC; but at high hydrogen level,only small restrain stress can cause HIC occurrence. At the same hydrogen content level ,the better the HAZ toughness, the higher resistance to HIC.

关 键 词：20MnNiMo钢 断口 氢致裂纹 焊接 

分 类 号：TG457.11[金属学及工艺—焊接] TG404