武汉科技大学耐火材料与冶金国家重点实验室,武汉 430081
吴圳楠(2002—),男,硕士生; E-mail : 2632367179@qq.com
宋新莉(1973—),女,博士,教授; E-mail : xlsong@wust.edu.cn
收稿:2024-05-09,
纸质出版:2025-01-30
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吴圳楠,姚开阳,陶芸等.NM450低合金耐磨钢的热处理组织与力学性能[J].特殊钢,2025,46(01):106-110.
Wu Zhennan,Yao Kaiyang,Tao Yun,et al.Microstructure and Mechanical Properties of Heat Treatment Low-alloy Wear-resistant Steel NM450[J].Special Steel,2025,46(01):106-110.
吴圳楠,姚开阳,陶芸等.NM450低合金耐磨钢的热处理组织与力学性能[J].特殊钢,2025,46(01):106-110. DOI: 10.20057/j.1003-8620.2024-00126.
Wu Zhennan,Yao Kaiyang,Tao Yun,et al.Microstructure and Mechanical Properties of Heat Treatment Low-alloy Wear-resistant Steel NM450[J].Special Steel,2025,46(01):106-110. DOI: 10.20057/j.1003-8620.2024-00126.
研究了不同温度淬火、低温回火对高强度低合金耐磨钢的组织、强度与耐磨性能的影响规律与机理,结果表明,高强度低合金耐磨钢在840 ℃淬火,200 ℃回火,得到板条马氏体加少量铁素体组织,在880~920 ℃淬火,200 ℃回火,得到板条马氏体,马氏体基体中均含有高密度位错,马氏体板条之间有纳米尺寸条状残余奥氏体。随淬火温度升高,耐磨钢NM450(质量分数/%:0.20C,0.50Si,2.0Mn,0.20Cr,0.03Als,≤0.015P,≤0.005S)的屈服强度在1 142~1 173 MPa,抗拉强度在1 553~1 599 MPa,伸长率在10.0%~12.0%。试验钢的强化机理主要是位错强化、细晶强化与固溶强化,试验钢磨损表面有大量的犁沟与磨屑,磨损机理主要是塑性变形。试验钢在880 ℃淬火,200 ℃回火的强度与耐磨性能均最佳。
The effects of quenching and tempering at different temperatures on the microstructure, strength and wear resistance of NM450 high strength low-alloy wear-resistant steel were studied. The results showed that the lath martensite with a small amount of ferrite structure was obtained for the high-strength low-alloy wear-resistant steel quenched at 840 ℃ and tempered at 200 ℃. The lath martensite was obtained and the martensite matrix contains high-density dislocation, and the residual austenite was distributed between the martensite lath for the steel quenched at 880 ℃-900 ℃ and tempered at 200 ℃.With the increase of quenching temperature, the yield strength of wear-resistan steel NM450(/%:0.20C,0.50Si,2.0Mn,0.20Cr,0.03Als,≤0.015P,≤0.005S)was between 1142 MPa and 1 173 MPa, the tensile strength was between 1 553 MPa and 1 599 MPa, the elongation was between 10.0% and 12.0%. The strengthening mechanism of the test steel was mainly dislocation strengthening and fine grain strengthening and solid solution strengthening. There were a lot of furrows and grinding chips of the steels for abrasive wear, and the wear mechanism was mainly plastic deformation. The strength and wear-resistance proformance was the best for the steel quenched at 880 ℃ and the tempered at 200 ℃.
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