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本文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_■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_■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抗力有很大影响。由块状残余奥氏体应力诱发转变生成马氏体,并氢致开裂,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,孔洞也可作勾裂纹扩展途径,易于开裂。还讨论了K_■和I_H的变化和不一致性。
In this paper, the effect of residual austenite content and its mechanical stability on the susceptibility to hydrogen cracking of 60Si2Mn steel was studied. The threshold value of hydrogen embrittlement stress K_ ■ and the hydrogen embrittlement rate I_H were used to evaluate the hydrogen induced cracking resistance of the material. The amount of retained austenite (8.4 ~ 17.9%) has little effect on K_ ■ value. After tempering and hydrogenation, the mechanical stability of retained austenite decreases. The residual austenite mechanical stability has a great influence on hydrogen embrittlement resistance. By the massive residual austenite stress induced transformation of martensite, and hydrogen induced cracking, the formation of holes. On the one hand holes can reduce the crack tip stress and improve hydrogen embrittlement resistance, on the other hand, the hole can also be tick crack extension, easy to crack. Also discussed K_ ■ and I_H changes and inconsistencies.