摘要
采用控轧控冷工艺生产的高强度低合金耐磨钢NM400,具有高强度、高硬度和较高的韧性,其屈服强度为1 170MPa,抗拉强度为1 369MPa,平均硬度为403HB,伸长率为23%,-20℃冲击功为47J。光学显微镜观察发现,NM400的组织为回火马氏体,淬透性良好;透射电镜下观察发现,钢中存在大量纳米尺寸级析出物,能谱分析表明,析出物为Ti,Nb的碳氮化物。分析结果表明,耐磨钢NM400的强化机制主要为位错强化、细晶强化和析出强化;细晶强化是韧性提高的主要原因。
Wear resistant steel NM400 with high strength and low alloy produced by controlled rolling and cooling process has high strength, high hardness and high toughness. The yield strength is 1 170 MPa, the tensile strength is 1369 MPa, the average hardness is 403 HB, the elongation is 23% and the impact energy at --20 ℃ is 47J. The microstructure is tempered martensite. There are a large number of nano-size carbonitrides of Ti and Nb in the steel. The analysis shows that wear-resistant steel NM400 is strengthened by dislocation strengthening, grain refinement strengthening and precipitation hardening. The toughness is increased by grain refinement.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2014年第7期77-82,共6页
Journal of Iron and Steel Research
关键词
耐磨钢
控轧控冷
晶粒细化
析出强化
位错强化
wear resistant steel
controlled rolling and cooling
grain refinement
precipitation strengthening
dislocation strengthening
