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用低碳马氏体钢制造的高强度发动机连杆螺栓及汽车发动机缸盖螺栓等,由于在镀锌过程中吸收过量的氢,致使钢件在生产流水线上或在服役中发生氢致延迟断裂现象。此外,饱和H_2S水溶液对低碳马氏体钢的延迟断裂也十分敏感。本文的目的在于探讨影响15MnVB钢氢脆断裂的主要因素,以寻找提高这种钢抗氢脆性能的最佳热处理工艺。
High-strength engine connecting rod bolts made of low-carbon martensitic steel and cylinder head bolts of automobile engines, etc., absorb hydrogen excessively in the galvanizing process to cause hydrogen-induced delayed fracture of the steel components in the production line or during service phenomenon. In addition, saturated H 2 S aqueous solution is also very sensitive to delayed fracture of low-carbon martensitic steel. The purpose of this paper is to explore the main factors affecting the hydrogen embrittlement fracture of 15MnVB steel in order to find the best heat treatment process to improve the hydrogen embrittlement resistance of this steel.