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本文研究了残余奥氏体量及其机械稳定性对60Si2Mn 钢氢致开裂敏感性的影响.采用氢脆应力强度门槛值(K_(th))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_(th)值影响不大。回火和充氢处理使残余奥氏体机械稳定性降低,并对氢脆抗力有很大影响。块状残余奥氏体应力诱发转变成马氏体,氢致开裂并形成孔洞。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。讨论了 K_(th)和 I_H 的变化。
In this paper, the effect of retained austenite content and its mechanical stability on the susceptibility to hydrogen cracking in 60Si2Mn steel was studied.The hydrogen induced material hydrogenation was evaluated by hydrogen embrittlement stress threshold (K_ (th)) and hydrogen embrittlement rate (I_H) Cracking sensitivity.The residual austenite content (8.4-17.9%) has little effect on the K th value. Tempering and hydrogen charging reduce the retained austenite mechanical stability and have a significant effect on hydrogen embrittlement resistance. Massive residual austenite stress-induced transformation into martensite, hydrogen induced cracking and the formation of holes. 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. The changes of K_ (th) and I_H are discussed.