烧结硬化粉末冶金钢在高性能零件中的应用  

Sinter-hardening PM steels with improved dimensional consistency for high performance components

作　　者：杨洁 王军 牛森 邹孟超 张佳渊 冯伟立 

机构地区：[1]赫格纳斯(中国)有限公司,上海201799 [2]东睦新材料集团股份有限公司,宁波225004

出　　处：《粉末冶金技术》2015年第1期22-28,共7页Powder Metallurgy Technology

摘　　要：粉末冶金烧结硬化是一种经济有效的生产高强度零件工艺过程。但是,其后续机加工相对困难和昂贵,因此尺寸公差控制也是烧结硬化过程中关注的重要目标。本文基于MPIF标准制备了多种烧结硬化材料,并对比了它们在同等压制压力下的测试试棒以及同等密度下工业粉末冶金零件上的强度、延伸率及尺寸稳定性表现。结果表明在工业生产条件下,所有材料都得到了有效烧结硬化并表现出了优秀的尺寸稳定性。在工业零件生产中,Cr M作为一种预合金无铜添加的经济有效的烧结硬化材料,由于它的高淬透性,在0.5%C(质量分数)添加时,表现出高的尺寸稳定性及极佳的性能。Sinter-hardening of PM components is an established cost-effective process to produce high strength parts. However,controlling dimensional tolerances is also an important objective while producing sinter-hardening components as machining afterwards is relatively difficult and expensive. This study is focusing on a comparative study of various sinter-hardening PM steels which are available on the market. Test specimens at the same compaction pressure and an actual PM component at the same density were studied in terms of strength,ductility and dimensional consistency. The study shows all the materials are effectively sinter hardened and good dimensional consistency is achieved under the industrial condition. Cr M as prealloyed and no copper added is the most cost effective material. Thanks to its high hardenability it achieves the highest dimensional consistency and robustness with 0. 5% C added at the industrial cooling rate.

关 键 词：粉末冶金 烧结硬化 尺寸稳定性 

分 类 号：TF12[冶金工程—粉末冶金]