摘要
随着低合金耐磨钢应用领域逐渐增加,对其中高温条件下的耐磨性能提出了要求。通过成分设计、控制轧制和离线热处理工艺制备了一种Mo、V合金化新型低合金高温耐磨钢。初步探索了其在300~500℃温度范围的高温磨损行为和组织演变,并与同硬度级别的商用常规耐磨钢NM450进行了对比分析。结果表明:通过添加Mo和V等元素可以抑制位错密度降低、板条合并以及渗碳体析出、长大过程,提高了高温耐磨钢的高温强度等力学性能,从而提高了其高温磨损性能。300、400、500℃温度的磨损性能分别是常规NM450的1.5、1.4和2.2倍左右。300到500℃的磨损机制由磨料磨损向氧化磨损和塑性变形转变。高温耐磨钢高温屈服强度相对更高,塑性变形更小。
With the increasing application of low alloy wear-resistant steel, the wear resistance of low alloy wear-resistant steels at moderate and high temperature is required. A novel low alloy high temperature wear-resistant steel with Mo and V elements was prepared via composition design, controlled rolling and off-line heat treatment. The wear behavior and microstructure evolution of the steel at 300-500 ℃ were analyzed and compared with the commercial conventional wear-resistant steel NM450 with the same hardness. The results show that the decrease of dislocation density, the coalescence of martensite lath, and the precipitation and growth of cementite could be inhibited by the addition of Mo and V elements, thus improving the mechanical properties such as high temperature strength of the high temperature wear-resistant steel. As a result, the high temperature wear resistance of the wear-resistant steel was improved. The wear resistance at 300, 400 and 500 ℃ was about 1.5, 1.4 and 2.2 times higher than that of the conventional wear-resistant steel NM450. The material wear mechanism was noticed to change from abrasive wear to oxidative wear and plastic deformation when the temperature was increased to 500 ℃ from 300 ℃. The high temperature wear-resistant steel possesses relatively high yield strength and relatively small plastic deformation.
作者
李成儒
邓想涛
梁亮
刘红艳
王昭东
LI Chengru;DENG Xiangtao;LIANG Liang;LIU Hongyan;WANG Zhaodong(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,Liaoning,China;Centre for Product and Technology,Hunan Valin Lianyuan Iron and Steel Company,Loudi 417009,Hunan,China;Technical Center of HBIS Group Han Steel,Handan 056000,Hebei,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2021年第8期862-870,共9页
Journal of Iron and Steel Research
基金
国家重点研发计划资助项目(2017YFB0305100)。
关键词
低合金钢
高温磨损
高温强度
磨损机制
low alloy steel
high temperature wear
high temperature strength
wear mechanism
