Microstructure evolution and performance improvement of powder metallurgy stainless steel with P addition  

作　　者：Qian Qin Dao-qing Zhang Fang Yang Cun-guang Chen Jun-jie Hao Zhi-meng Guo 

机构地区：[1]Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China [2]Shunde Innovation School,University of Science and Technology Beijing,Guangzhou 528399,Guangdong,China

出　　处：《Journal of Iron and Steel Research International》2023年第10期2055-2066,共12页

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.U21A200305 and 51925401);the Research Project on Characteristic Innovation of University Teachers in Foshan City(No.2021XJZZ07);the Scientific and Technological Innovation Foundation of Foshan,USTB(No.BK21BE001).

摘　　要：P-containing 316L stainless steel was prepared by powder metallurgy technology using gas atomized alloy powder and phosphorus-iron alloy powder as raw materials.P addition was beneficial to sintering densification.With 0.6 wt.%P addition,the density increased from 7.60 to 7.82 g/cm^(3).In such case,the samples with 0.6 wt.%P addition should be sintered at a lower temperature of 1200℃.Otherwise,there were coarse grain boundary precipitates,which would seriously deteriorate the performance of stainless steel.In the case of suppressing the formation of coarse precipitates,appropriate P content had a beneficial effect on apparent morphology,hardness and strength of stainless steel.When 316L-0.6 wt.%P sample was sintered at 1200℃,the hardness and tensile strength were increased to 86.3 HRB and 672.8 MPa,respectively,and the elongation still reached 38.1%.Besides,it also had good corrosion resistance.

关 键 词：PHOSPHORUS Stainless steel Powder metallurgy Precipitate phase Performance 

分 类 号：TG14[一般工业技术—材料科学与工程]