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通过对不同强度等级的40CrNiMo,50Mn 18Cr4MoVN,34CrNi3Mo钢的SCC研究,探讨了强度对不同机理SCC敏感性的影响规律。试验结果表明,强度对不同类型SCC的敏感性有着不同的影响。对于由氢脆和由强化相构成连续活性通道阳极溶解机理控制的SCC,提高强度使钢的抗SCC能力降低;而在塑性变形所控制下的SCC,提高钢的强度可以提高抗SCC的能力。
Through the SCC study of 40CrNiMo, 50Mn 18Cr4MoVN and 34CrNi3Mo steels with different strength grades, the influence of the strength on the SCC sensitivity of different mechanisms was discussed. The experimental results show that the intensity has different effects on the sensitivity of different types of SCCs. For SCC controlled by hydrogen embrittlement and anodic dissolution mechanism controlled by continuously active channels composed of strengthening phases, increasing the strength decreases the resistance of steel to SCC; while in SCC under the control of plastic deformation, increasing the strength of steel can improve the resistance to SCC.