低成本高韧性NM500钢板的研究及开发  

Research and development of low cost and high toughness NM500 steel plate

作　　者：高擎[1] 王麒 张青学[1] 钱亚军[1] 邓想涛[2] 王昭东[2] GAO Qing;WANG Qi;ZHANG Qingxue;QIAN Yajun;DENG Xiangtao;WANG Zhaodong(Hunan Xiangtan Hualin Iron and Steel Co.,Xiangtan 411101,Hunan,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]湖南华菱湘潭钢铁有限公司,湖南湘潭411101 [2]东北大学轧制技术及自动化国家重点实验室,辽宁沈阳110819

出　　处：《钢铁研究学报》2024年第6期743-751,共9页Journal of Iron and Steel Research

基　　金：国家重点研发计划资助项目(2017YFB0305100)。

摘　　要：通过在普通NM500合金基础上进行合金减量化设计,结合高纯净度冶炼以及合理的热处理制度,成功开发出具有易焊接、良好综合力学性能和耐磨性能的低成本NM500钢板。低成本NM500钢板全厚度组织为板条马氏体,大角度晶界占比为71.6%,有效晶粒尺寸为1.94μm,硬度HV为500~520,屈服强度为1 222 MPa,抗拉强度为1 583 MPa,伸长率为9.6%,-40℃冲击功为58.8 J。其耐磨性和普通NM500钢板的耐磨性相同,且形貌均由犁沟和少量剥落坑组成。对于能完全淬透的组织,合金减量化对组织和性能影响较小。Through the alloy reduction design on the basis of ordinary NM500 alloy,combined with high purity smelting and reasonable heat treatment,a low cost NM5o0 steel plate with easy welding,good comprehensive mechanical properties and wear resistance was successfully developed.The full thickness microstructure of low cost NM500 steel plate was lath martensite with the effective grain size of 1.94μm,and the proportion of high angle grain boundary was 71.6%.The HV hardness of low cost NM500 steel plate was between 500-520 with the yield strength,the tensile strength and the elongation of 1222 MPa,1583 MPa and 9.6%,respectively.The impact energy of low cost NM500 steel plate at-40℃was 58.8 J.Its wear resistance was the same as that of ordinary NM500 steel plate,and the morphology was composed of grooves and a small amount of spalling pits.For the structure that can be completely quenched,the alloy reduction has little effect on the structure and properties.

关 键 词：NM500 低成本 高韧性 力学性能 耐磨性 

分 类 号：TG141[一般工业技术—材料科学与工程]