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采用恒载荷缺口拉伸试验和慢应变速率拉伸试验研究了30CrMnSiA钢在不同回火温度下的氢致延迟断裂行为。结果表明,随着回火温度的提高,实验钢的延迟断裂抗力逐渐提高,510℃回火时可获得良好的耐延迟断裂性能。实验钢在充氢前的断裂机制为准解理+少量韧窝断裂,且随着回火温度的升高,断口中韧窝断裂的比例增加;实验钢在充氢后或在腐蚀液中加载时,350℃和400℃回火试样的断裂机制转变为氢致沿晶断裂,510℃回火试样的断裂机制则未发生变化。
Hydrogen-induced delayed fracture behavior of 30CrMnSiA steel at different tempering temperatures was studied by a constant-load notched tensile test and a slow-strain tensile test. The results show that with the increase of tempering temperature, the delayed fracture resistance of the experimental steel gradually increases, and good delayed fracture resistance can be obtained when tempering at 510 ℃. The fracture mechanism of the experimental steel before charging hydrogen was quasi-cleavage + a small number of dimples fractured, and with the increase of tempering temperature, the proportion of dimple fracture in the fracture increased; the experimental steel was charged with hydrogen or in the etching solution , The rupture mechanism of the samples tempered at 350 ℃ and 400 ℃ was changed to hydrogen-induced intergranular fracture, and the rupture mechanism at the tempering temperature of 510 ℃ did not change.