NM450低合金耐磨钢的热处理组织与力学性能  

Microstructure and Mechanical Properties of Heat Treatment Low-alloy Wear-resistant Steel NM450

作　　者：吴圳楠 姚开阳 陶芸 周伟成 万欣 宋新莉[1] Wu Zhennan;Yao Kaiyang;Tao Yun;Zhou Weichen;Wan Xin;Song Xinli(State Key Laboratory of Refractory Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学耐火材料与冶金国家重点实验室,武汉430081

出　　处：《特殊钢》2025年第1期106-110,共5页Special Steel

基　　金：武汉科技大学大学生创新项目(23Z007)。

摘　　要：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1142~1173 MPa,抗拉强度在1553~1599 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 resis⁃tance 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 1173 MPa,the tensile strength was between 1553 MPa and 1599 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 fur⁃rows 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℃.

关 键 词：耐磨钢NM450 组织 强度 磨损 

分 类 号：TG161[金属学及工艺—热处理]