为了得到屈服强度960 MPa级高强度低碳结构钢的最佳钼含量和热处理工艺,采用显微组织分析、力学性能检验、断口分析等方法研究了热处理工艺对不同钼含量试验钢显微组织与力学性能的影响.结果表明:随钼含量增加,淬火态试验钢的抗回火软化能力逐渐增强;最优钼含量为0.4%(质量分数),此成分试验钢经最佳热处理工艺(880℃淬火+580℃回火)处理后屈服强度为988 MPa(达到试制要求),抗拉强度为1 000 MPa,伸长率为15.5%,-20℃夏比冲击功为52 J,且冲击断口具有韧窝特征,此时试验钢显微组织为回火托氏体,淬火马氏体板条部分发生分解.
To obtain the beat chemical composition and heat treatment of the high-strength low-carbon steel with 960 MPa yield strength,the effect of heat treatment on microstructure and mechanical properties of the tested steels with different Mo contents was investigated by microstructure analysis,mechanical property testing and impact fracture examination.The results show that the tempering resistant ability of the quenched steel increased with the increase of Mo content.The best heat treatment (quenching at 880℃ and temperting at 580℃) for the tested steel with optimal Mo content of 0.4wt% was determined.With this treatment the steel could get the yield strength 980 MPa,tensile strength 1 000 MPa,elongation 15.5%,average Charpy impact energy at-20℃ 52 J and the impact fracture surface had dimple characteristic.The mitcrostructure was tempered sorbite,and the lath martensite was partly resolved.
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