低合金耐磨钢的热处理工艺及力学性能  

Heat treatment process and mechanical properties of low alloy wear-resistant steel

作　　者：张志春 温佳 陈国瑞 吴广辉 翁泽钜 顾开选[3] Zhang Zhichun;Wen Jia;Chen Guorui;Wu Guanghui;Weng Zeju;Gu Kaixuan(Shaanxi Railway and Logistics Industry Group Co,Ltd,Xi'an Shaanxi 710076,China;Hunan Lince Rolling Stock Equipment Co.,Ltd.,Zhuzhou Hunan 412001,China;Key Laboratory of Cryogenics,TIPC,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]陕西铁路物流集团有限公司,陕西西安710076 [2]湖南联诚轨道装备有限公司,湖南株洲412001 [3]中国科学院低温工程学重点实验室(理化技术研究所),北京100190

出　　处：《金属热处理》2023年第9期220-225,共6页Heat Treatment of Metals

基　　金：国家自然科学青年基金(51805521)。

摘　　要：采用DIL805淬火膨胀仪测定低合金耐磨钢的CCT曲线,研究其连续冷却过程中的相变规律,并采用OM对不同冷速下的试样进行显微组织观察。此外,采用淬火+回火工艺、淬火+深冷处理+回火工艺对低合金耐磨钢进行热处理,利用SEM表征和拉伸、冲击试验对试样进行分析,研究深冷处理对低合金耐磨钢组织和性能的影响。结果表明,试验钢的马氏体临界冷速为5℃/s,增加深冷处理使低合金耐磨钢的抗拉强度和屈服强度分别提高136.5 MPa和141.5 MPa,塑性保持不变,但冲击性能略有下降。深冷处理提高低合金耐磨钢强塑性的主要作用机理为促进马氏体板条细化。CCT curves of a low alloy wear-resistant steel were measured by using a DIL805 quenching dilatometer to study its phase transformation law during continuous cooling.The microstructure of the specimens at different cooling rates was observed by using OM.In addition,the low alloy wear-resistant steel was heat treated by using quenching+tempering process,quenching+cryogenic treatment+tempering process,and the specimens were analyzed by using SEM characterization,tensile and impact tests to study the effect of cryogenic treatment on the microstructure and properties of the tested steel.The results show that the critical cooling rate of martensite transformation of the tested steel is 5 ℃/s.The tensile strength and yield strength of the low alloy wear-resistant steel are increased by 136.5 MPa and 141.5 MPa,respectively,with the addition of cryogenic treatment.The impact property is decreased slightly while the plasticity remains unchanged after cryogenic treatment.The main mechanism of improvement of the strength and plasticity of low alloy wear-resistant steel caused by cryogenic treatment is to promote the refinement of martensitic lath.

关 键 词：低合金耐磨钢 热处理 深冷处理 微观组织 力学性能 

分 类 号：TG156.91[金属学及工艺—热处理]