摘要
为进一步提高高速钢工模具的性能,首次利用脉冲爆炸-等离子体(PDT)技术对M2高速钢进行了表面改性,利用SEM、XRD分析了M2高速钢经PDT处理前后的表层组织和相结构,采用显微硬度计、摩擦磨损试验机及极化曲线研究了M2高速钢经PDT处理前后的显微硬度、耐磨性能和耐蚀性能。结果表明:PDT处理使M2高速钢表层发生马氏体α’-Fe向奥氏体γ-Fe的相转变过程,随着PDT处理脉冲个数的增加,奥氏体含量增加,且部分碳化物固溶于奥氏体中;经PDT处理后,M2高速钢表面形成平均厚度为8.9μm的改性层,改性层组织细小致密,碳化物颗粒细小且分布均匀;在PDT处理过程中的爆炸冲击产生的高温高压作用下,高速钢表层在深度达100μm范围内显微硬度得到提高,耐磨性能最多提高了2.3倍,耐腐蚀性能也明显改善。
Surface modification of M2 high-speed steel was performed with pulse detonation-plasma technology(PDT) for the first time.The SEM and XRD were used to analyze the surface structure and phases,and the microhardness tester,friction wear testing machine and polarization curves were used to investigate the microhardness,abrasion resistance and corrosion resistance of M2 high-speed steel before and after treated by PDT.Results showed that the PDT treatment led to the phase change from martensite α'-Fe to γ-Fe,and with the increase of pulse number of PDT treatment,the austenite content increased and part of carbides dissolved in austenite.After treated by PDT,a modified layer with the average thickness of 8.9μm was formed on the M2 high- speed steel surface,and its structure was fine and compact with uniform and tiny carbide particles.Besides,under the effect of high pressure and high temperature caused by the explosion during PDT process,the microhardness of the M2 high-speed steel surface in the range of 100μm was enhanced,and the wear resistance was improved by up to2.3 times.Furthermore,the corrosion resistance also increased obviously.
出处
《材料保护》
CAS
CSCD
北大核心
2016年第3期4-7,共4页
Materials Protection
基金
科技部国际合作项目(2013DFR50900)
江西省对外科技合作计划项目(20121BDH80031)
江西省科技支撑计划项目(20151BBB50264)资助
关键词
脉冲爆炸-等离子体
M2高速钢
表面改性
组织结构
摩擦磨损
耐蚀性
pulse detonation-plasma technology
M2 high-speed steel
surface modification
structure
friction and wear
corrosion resistance
