微钒Cr-B系NM400耐磨钢的热处理工艺  

Heat Treatment Process of Cr-B Series Wear Resistant Steel NM400 With Micro-V

作　　者：赵月强[1,2] 兰亮云[1] 李灿明[1,3] 赵德文[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819 [2]济钢集团有限公司,山东济南250101 [3]莱芜钢铁集团有限公司,山东莱芜271104

出　　处：《钢铁》2013年第1期70-74,共5页Iron and Steel

基　　金：国家自然科学基金资助项目(51074052)

摘　　要：采用在Cr-B系中添加微量钒的低成本设计思路来确定NM400耐磨钢的合金成分,详细研究了不同淬火温度和回火温度对NM400耐磨钢显微组织和力学性能的影响,获得了适合工业生产的热处理工艺制度。通过光学显微镜、SEM和TEM观察,分析了经不同温度回火后马氏体组织精细结构的演变规律。结果表明:试验钢具有良好的淬透性,经900～930℃淬火、250℃保温90min回火后得到均匀细小的回火板条马氏体组织;TEM分析表明,回火板条马氏体的宽度在0.1～0.2μm,板条内分布细小均匀的碳化物析出粒子(主要是10～20nm碳氮化钒),提高钢的综合力学性能。The alloy components of NM400 steel were determined by adding micro-V in Cr-B series wear resistant steel according to the low cost design ideas.Detailed research on different quenching temperatures and tempering temperatures shows the influence of different parameters on the microstructure and mechanical properties of the NM400 steel.The optimal parameters of heat treatment process are obtained,which are suitable for industrial production.Through the observation and analysis by optical microscope,SEM and TEM,the evolution law of fine structure in the lath martensite is obtained after tempering through different temperatures.The results show that the steel has high hardenability.The fine lath martensite which is distributed uniformly can be obtained after quenching at 900-930 ℃ and tempering at 250 ℃ for 90 minutes.The results analysed by TEM show that the lath martensite tempered is in width of 0.1-0.2 μm and the fine carbides（mainly V（C,N） in size of 10-20 nm） are distributed uniformly,which improve the comprehensive mechanical properties of the steel.

关 键 词：微钒 Cr-B系 NM400 耐磨钢 热处理 

分 类 号：TG161[金属学及工艺—热处理]