注射成形M4高速钢的研究  

STUDY ON POWDER INJECTION MOLDING TECHNOLOGY OF M4 HIGH SPEED STEEL

作　　者：康胜哲[1] 秦明礼[1] 金钟建[1] 曲选辉[1] 

机构地区：[1]北京科技大学材料科学与工程学院新金属材料重点实验室,北京100083

出　　处：《粉末冶金工业》2005年第4期1-5,共5页Powder Metallurgy Industry

基　　金：国家"863"计划资助项目(No.2003AA331140)

摘　　要：研究了惰性气体雾化法制备的M4高速钢合金粉末进行注射成形工艺,由于粉末颗粒球形度和流动性好,粉末装载量可以达到70%(体积分数),注射料表现假塑性流体的特性.注射坯采用溶剂脱粘+后续热脱粘工艺进行脱粘,总共脱粘时间为14 h.在氮气气氛中1 250℃烧结2 h,可以制备出烧结态硬度为HRC 57～59的高速钢材料,热处理后材料的硬度可达HRC 64～65.微观结构分析表明,PIM高速钢组织均匀,富钨M6C碳化物和富钒M(C,N)碳氮化物弥散分布在高速钢基体中.The powder injection molding technology of M4 high speed steel is studied. The powder loading of M4 high speed steel powder manufactured by gas atomizing process could reach up to 70 % and the feedstock exhibites pseudo-plastic flow behavior. The polymeric components of the green parts are removed by solvent debinding and thermal debinding for 14 h in total. Sintering is carried out at 1 250℃ for 2 h under nitrogen atmosphere. The hardness of parts after sintering and heat treatment is 57-59 HRC and HRC 64-65 respectively. M6C carbides and M（C,N）carbonitrides distribute uniformly in the matrix as shown by microscopic observation.

关 键 词：高速钢 注射成形 力学性能 

分 类 号：TF124.39[冶金工程—粉末冶金]