960MPa级含钼低碳钢钼含量与热处理工艺的确定
Determination of Mo Content and Heat Treatment of 960 MPa Molybdenum-Containing Low-Carbon Steel
摘 要
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.
钼
热处理
力学性能
显微组织
low-carbon steel
molybdenum
heat treatment
mechanical property
microstructure
Abstract
To obtain the best 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 microstructure was tempered sorbite,and the lath martensite was partly resolved.
中图分类号 TG146.1
所属栏目 试验研究
基金项目
收稿日期 2009/2/9
修改稿日期 2009/11/20
网络出版日期
作者单位点击查看
备注郑华(1979-),男,河南周口人,工程师,博士.
引用该论文: ZHENG Hua,LIU Chang-ming,HAN Rong-dong,ZHENG Lin. Determination of Mo Content and Heat Treatment of 960 MPa Molybdenum-Containing Low-Carbon Steel[J]. Materials for mechancial engineering, 2010, 34(2): 8～11
郑华,刘昌明,韩荣东,郑琳. 960MPa级含钼低碳钢钼含量与热处理工艺的确定[J]. 机械工程材料, 2010, 34(2): 8～11
被引情况:
【1】张凯,易小刚,彭倩筠,曾邵华,周水波, "热处理工艺对工程机械用1000 MPa级高强钢组织与性能的影响",机械工程材料 38, 29-34(2014)
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参考文献
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【5】李升龙,郝启玺.高强度焊接结构钢HQ100及配套焊接材料的研究[J].鞍钢技术,1994,52(4):39-47.
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【7】CRAIG B D,KRAUSS G.The structure of tempered martensite and its susceptibility to hydrogen stress cracking[J].Metallurgical and Materials Transactions A,1980,11(11):1799-1808.
【8】GOJIC M,KOSEC L,MATKOVIC P.The effect of tem-pering temperature on mechanical properties and microstructure of low alloy Cr and CrMo steel[J].Journal of Materials Science,1998,33(2):395-403.
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