Study on microstructure and mechanical properties of powder metallurgy high manganese non-magnetic Fe-25Mn-xCu-C steels
ZHU Quan-li1，LIU Yan-xiao1，CHEN Jia-jian2
（1. National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials， South China University of Technology， Guangzhou 510641， China 2. Guangdong Yuehai Huajin Technology Co.， Ltd.， Guangzhou 511356， China）
Abstract：In order to study the influence of copper content on the microstructure and properties of powder metallurgy high manganese non-magnetic steel， high manganese pre-alloyed powder Fe-25Mn-C and electrolytic copper powder were used to prepare test sample by PM process. The microstructure and tensile properties of the sintered materials were tested. The results show that the microstructure of sintered sample is austenite， copper phase， FeCu4 phase， Fe3Mn7 phase and pores. When the copper content changes from 5% to 20% （mass percent）， with the increase of copper content， the density of high manganese non-magnetic steel increases， while the tensile strength and elongation of the sample first increase and then decrease， both reaching the peak values at 15% copper content， which are 645 MPa and 14.88% respectively.
[1]李长生，马彪，宋艳磊，郑建军.无磁钢的研究概况和我国无磁钢的发展思路[J].河南冶金, 2014, 22(1):1-11
[2]赵先存, 杨志勇, 宋为顺, 等.[J]., 2010, :186-215
[3] Liu T, Liu H Y, Zhao Z T, Ma R Z, Hu T D and Xie Y N.Mechanical alloying of Fe-Mn and Fe-Mn-Si[J]., 1999, (271):8-13
[4] Hryha E and Dudrova E.The sintering behaviour of Fe-Mn-C powder system, correlation between thermodynamics and sintering process, manganese distribution and microstructure composition, effect of alloying mode[J].Intech, 2011, (p):573-602
[5] Schroeder R, Filho A T R and Binder Cand Klein A N.Adjusting the sintering cycle of a Hadfield sintered steel produced by metal injection molding [J]., 2015, (18):83-90
[6] Oro R, Campos M, Torralba JM and Capdevila C.Lean alloys in PM: from design to sintering performance[J]., 2012, (55):294-301
[7] Lindsley B and James B.PM steels that contain manganese[J]., , (30):63-73
[8] Salak A and Selecka M.Manganese in Powder Metallurgy Steels[J]., 2012, (p):39-71
[9] 郭庚辰.[J]., 2003, :1-343
[10] Lijun Zhang, Qing Cheng, Honghui Xu and Hai-lin Chen.Thermodynamic description of the Cu-Fe-Mn system with key experiments and its practical applications[J]., 2015, :1306-1318
[11] R M German.Kinetics of Liquid Phase Sintering[J]., 1988, (105A):215-220
[12]Kurgan N.Varol RMechanical properties of PM 316L stainless steel materials[J].Powder Technology, 2010, 201(3):242-247
2019, Vol. 29 
