微细Cr-Fe合金粉对粉末冶金钢组织与性能的影响  

Effect of the fine Cr-Fe alloy powder on the microstructure and properties of powder metallurgy steels

作　　者：牟楠[1] 雷龙林 徐然[1] 唐琳 罗丰华[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]宁波方太厨具有限公司,浙江宁波315336

出　　处：《粉末冶金工业》2015年第2期25-30,共6页Powder Metallurgy Industry

基　　金：国家科技支撑计划项目(2009BAE74B02)

摘　　要：在Fe-0.5Mo预合金粉末中加入平均粒径为4.65μm的Fe Cr55C600高碳Cr-Fe合金粉末,于1 200℃,采用烧结硬化工艺制备Fe-Cr-Mo粉末冶金合金钢。结果表明:随着Cr-Fe合金粉末量的增加,合金烧结试样的硬度增加,强度增加,合金的显微组织以贝氏体为主。当添加微细颗粒的Cr-Fe合金粉末,使Cr质量分数达到1.7%时,合金烧结试样的综合性能达到最优,抗拉强度为1 210 MPa,硬度为30 HRC,显微组织主要为细小的下贝氏体和马氏体,此时合金中Cr/C质量比约为1.54。The Fe- Cr- Mo PM steel was obtained from the mixed Fe Cr55C600 high carbon ferrochrome powders with a mean particle size of 4.65 μm and the Fe-0.5Mo water atomized pre-alloyed powders, sintered at 1 200℃ by sinter hardening process. The results indicate that the hardness and strength of the sintered alloys increase as the content of Cr-Fe alloy powder increasing. The microstructure of the sintered specimens is mainly composed of bainite. When adding ultrafine Cr-Fe alloy powder, leading to the Cr mass content of 1.7%, Fe-Cr-Mo PM steels have optimal properties, with tensile strength of 1 210 MPa and hardness of 30 HRC. Main microstructure of the alloy is a mixture of fine lower bainite and martensite, and mass ratio of the alloy element of Cr/C is about 1.54.

关 键 词：Cr-Fe合金粉 粉末冶金钢 烧结硬化 

分 类 号：TF122[冶金工程—粉末冶金] TF125.1[冶金工程—冶金物理化学]