铌对喷射成形M3:2高速钢组织和耐磨性的影响  

Effect of Nb on microstructure and wear resistance of spray-formed M3:2 high speed steel

作　　者：张程[1] 黄进峰[1] 吴健安[1] 连勇[2] 王和斌[1] 张济山[1] 李书开 王宏亮[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]北京科技大学新材料技术研究院,北京100083

出　　处：《金属热处理》2016年第2期1-6,共6页Heat Treatment of Metals

基　　金：国家重点基础研究发展计划(973计划)(2011CB606303)

摘　　要：研究了Nb对喷射成形高速钢M3:2组织和硬度的影响,并对含Nb喷射成形高速钢在不同温度下的摩擦行为进行了研究。结果表明,Nb可以使一次MC型碳化物变得更细小、球形度更好,M_2C片层厚度变薄,有利于高速钢回火过程中的二次析出,提高其回火硬度。0.5%Nb的添加可显著提高喷射成形M3:2高速钢的耐磨性。常温(20℃)时高速钢的磨损机制主要为磨粒磨损;中温(300℃)时,磨损机制则以粘着磨损为主,氧化磨损增加;高温(500℃)时,主要以氧化磨损为主。Effect of niobium on microstructure and hardness of spray formed M3：2 high speed steel was investigated. And the wear behavior of M3：2 high speed steel with Nb at different temperature is also discussed. The results show that the addition of niobium can make MC carbides smaller and more spherical,and M_2C lamellar more thinner,which is helpful for secondary precipitation of high speed steel during tempering and improving the hardness after tempering. With the temperature increased,the M3-0. 5Nb high speed steel presents better wear resistance than that of the M3 steel. Wear mechanism of the high speed steels is depends on the temperature. At room temperature,abrasive wear dominates; near 300 ℃,it transfer to adhesive wear,and the oxidation wear gradually increases. At higher temperature,near 500 ℃,the wear mechanism is oxidation wear accompanied with some abrasive wear and adhesive wear.

关 键 词：喷射成形 高速钢 耐磨性 碳化物 

分 类 号：TG142.45[一般工业技术—材料科学与工程]