金属注射成形17-4PH不锈钢的研究  

Metal injection molding 17-4PH stainless steel

作　　者：李益民[1] K. A. Khalil 黄伯云[1] 

机构地区：[1]中南大学粉末冶金重点实验室,长沙410083

出　　处：《粉末冶金技术》2005年第4期254-258,共5页Powder Metallurgy Technology

基　　金：国家"八六三"计划资助项目(2001AA337050);霍英东基金资助项目(81041);全国优秀博士学位论文作者专项基金资助项目(200135)

摘　　要：研究了17-4PH不锈钢的金属注射成形工艺及其流变学性能、力学性能、微观组织和耐腐蚀性能。结果表明:采用65%PW-30%EVA-5%SA粘结剂组成的注射料具有最好的综合流变学性能。在1 380℃保温90 min的烧结条件下,注射成形17-4PH不锈钢的力学性能最佳,孔隙分布均匀,晶粒尺寸适中。而保温60和120 min则分别表现出烧结不完全和过烧现象。1 380℃保温90 min烧结所得到的力学性能为ρ=7.70 g/cm3,σb=1 275 MPa,δ=5%,硬度36 HRC。注射成形17-4 PH不锈钢的密度、抗拉强度、硬度随着烧结温度的升高而提高,伸长率则随着烧结温度的升高而下降。17-4 PH不锈钢的耐蚀性好,腐蚀期长,具有活化-化金属极化曲线的特征,但钝化电位范围较窄,耐点蚀性能较差。The rheological properties, mechanical properties, microstructure and anticorrosive properties of injection molded 17-4 PH stainless steel were investigated. The feedstock based on the binder 65% PW-30%EVA-5% SA has the best general rheological properties for the 17-4 PH stainless steel powder. The 17-4 PH stainless steel compacts sintered at 1380℃ for 90min have the best mechanical properties and the good microstructure with homogeneously distributed pore structure and the moderate-sized grains. Whereas the compacts sintered for 60min and 120min show the inadequate sintered microstructure and the over-sintered microstructure respectively. The compacts sintered at 1380℃ for 90min have the density of 7.70g/cm^3, the strength of 1275MPa, the elongation of 5%, and the hardness of 36 HRC. With the increase of sintering temperature, the density, strength and the hardness increase, whereas the elongation decreases. The 17-4 PH stainless steel has good anticorrosive properties and the long corrosion period. It has an activation-passivation polarization curve, but the passivation potential range is narrow. The spot corrosion is relatively easy to occur.

关 键 词：金属注射成形(MIM) 17—4PH不锈钢 金属注射成形 不锈钢 流变学性能 耐腐蚀性能 注射成形工艺 力学性能 烧结条件 烧结温度 

分 类 号：TF124.39[冶金工程—粉末冶金] TG142.71[冶金工程—冶金物理化学]