粉末冶金含铜无磁钢平衡块的组织与性能研究

Research on microstructure and properties of copper-containing nonmagnetic steel balance block by powder metallurgy technique

采用高锰预合金粉C0.3-Mn19-Fe,添加5%~20%的电解铜粉,通过PM工艺制备无磁钢制品,研究铜含量对粉末冶金高锰无磁钢的显微组织和力学性能的影响。结果表明:用高温推舟炉在1 280℃,N_2-H_2气氛下保温1.5 h,材料的显微组织为奥氏体、铜相和孔隙;材料的抗拉强度和断后伸长率均随铜含量的增加呈先升后降趋势;当铜含量为15%时,抗拉强度和断后伸长率最高,分别达到645 MPa和14.88%。

The nonmagnetic steels are prepared by high-manganese pre-alloyed steel powders（ C0.3-Mn19-Fe） and electrolytic copper powder（ 5%-20%） by PM（ powder metallurgy） technique,and the influence of copper contents on the microstructure and mechanical properties of high-manganese nonmagnetic steel by PM technique is studied. The results show that with compactions sintered for 1.5 h at 1 280 ℃ in the mesh belt furnace under dissociated atmosphere of N_2-H_2,the microstructure are austenite,copper and pore. With the increase of copper content,the tensile strength and elongation increase first and then decrease. When the copper content is15%,the optimal values of tensile strength and elongation are obtained,which are 645 MPa and14.88% respectively.