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研究了残余奥氏体量及其力学稳定性对60Si2Mn 钢氢致开裂敏感性的影响。采用氢脆应力强度门槛值 K_(Ih)和氢致脆化率 I_H 评定材料氢致开裂敏感性。残余奥氏体量(8.4%～17.9%)对 K_(Ih)值影响不大。经回火和充氢处理,残余奥氏体力学稳定性降低,残余奥氏体力学稳定性对氢脆拉力有很大影响。由块状残奥应力诱发转变生成的马氏体,氢致开裂形成孔洞。一方面孔洞能降低裂纹尖端应力和提高氢脆抗力,另一方面,孔洞也可作为裂纹扩展途径,易于开裂。还讨论了 K_(Ih)和 I_H 以不同程度的变化和不一致性.
The effect of residual austenite content and its mechanical stability on the susceptibility to hydrogen cracking of 60Si2Mn steel was studied. The hydrogen induced dehiscence susceptibility of the material was evaluated by using hydrogen embrittlement stress threshold K_ (Ih) and hydrogen embrittlement rate I_H. The amount of retained austenite (8.4% ~ 17.9%) has little effect on K_ (Ih). After tempering and hydrogenation, the mechanical stability of retained austenite decreases, and the mechanical stability of retained austenite has a great influence on the tensile strength of hydrogen embrittlement. The martensite generated by the massive Para-Austrian stress-induced transformation generates pores by hydrogen cracking. On the one hand, the holes can reduce the crack tip stress and improve the hydrogen embrittlement resistance. On the other hand, the holes can also be used as the crack propagation path, which is easy to crack. Also discussed K_ (Ih) and I_H to varying degrees of change and inconsistency.