| 20MnNiMo钢焊接氢致裂纹特征(Ⅱ) |
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| 引用本文： | 张显辉,焦伟,谭长瑛.20MnNiMo钢焊接氢致裂纹特征(Ⅱ)[J].焊接学报,2002,23(3):23-25. |
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| 作者姓名： | 张显辉 焦伟 谭长瑛 |
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| 作者单位： | 哈尔滨焊接研究所,哈尔滨,150080 |
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| 基金项目： | 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 ) |
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| 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 ,抵抗氢致裂纹的能力越强
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| 关 键 词： | 20MnNiMo钢 氢致裂纹 断口 |
| 文章编号： | 0253-360X(2002)03-23-03 |
| 修稿时间： | 2001年12月20 |
Hydrogen-induced Cracking Feature of Steel 20MnNiMo |
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| ZHANG Xian-hui.Hydrogen-induced Cracking Feature of Steel 20MnNiMo[J].Transactions of The China Welding Institution,2002,23(3):23-25. |
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| Authors: | ZHANG Xian-hui |
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| Abstract: | 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. |
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| Keywords: | OMnNiMo hydrogen-induced cracking fractography toughness |
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