AHPT15M粉末冶金高速钢冷处理工艺研究  

Effects of Cryogenic Treatment on AHPT15M Powder Metallurgy High Speed Steel

作　　者：梁文瑞[1] 孙世清[1] 王丽婷[1] 马文旭[1] 

机构地区：[1]河北科技大学材料科学与工程学院,河北石家庄050018

出　　处：《热处理技术与装备》2012年第6期15-19,共5页Heat Treatment Technology and Equipment

摘　　要：本文对AHPT15M粉末冶金高速钢的冷处理工艺进行了研究,分析了冷处理温度、冷处理时间等工艺参数对试样力学性能及残余奥氏体含量的影响,并利用电子扫描显微镜观察冷处理与未冷处理试样的显微组织。试验结果表明:经过冷处理后形成了一种更为细小的针片状马氏体显微组织,残余奥氏体含量明显减少,并伴有超细碳化物析出,从而提高了试样的硬度及耐磨性。AHPT15M粉末冶金高速钢较好的冷处理工艺为:淬火+冷处理+两次回火;较好的冷处理工艺参数为:温度-130～-150℃,保温时间以钢件冷透为准。This article studies the cryogenic treatment process of AHPT15M powder metallurgy high speed steel,and analyses the effects of cryogenic treatment process parameters on the mechanical properties and the retained austenite content,and observes microstructure with or without cryogenic treatment by the SEM.The results show that a finer needle-like martensite microstructure formes after cryogenic treatment,and the residual austenite content decreases with ultrafine carbide precipitation,thereby the hardness and wear resistance increases.The suitable cryogenic treatment process as follows：quenching ＋ cryogenic treatment ＋ tempering twice;the cryogenic treatment temperature is-130^-150 ℃,and holding time is long enough to make the steel cold throughtly.

关 键 词：粉末冶金高速钢 冷处理 力学性能 显微结构 

分 类 号：TG156.91[金属学及工艺—热处理]