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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
The effects of diffusion hydrogen content and welding cooling rate (t8 / 3) on hydrogen induced cracking in 20MnNiMo steel were studied by using the plug test method. The fracture morphology of hydrogen induced cracking was observed by scanning electron microscopy. The results show that there is a strong dependence between the hydrogen induced crack and the diffusible hydrogen content in 20MnNiMo steel. Under low hydrogen conditions, hydrogen-induced cracking requires a high restraining stress, whereas under high hydrogen conditions, hydrogen-induced cracking can be induced by a small amount of stress. Under the condition of the same diffusion hydrogen content, the better the toughness in the heat-affected zone, the stronger the resistance to hydrogen induced cracking