Dimensional stability and mechanical properties of HK30 stainless steel by metal injection molding
TANG Zhihao1,2, PAN Chaomei2, HE Pengjiang2, LUO Hao2, SONG Xinqiang2, ZENG Keli1,2
1. College of Materials Science and Engineering, Central South University, Changsha 410000, China; 2. Guangdong Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510000, China
Abstract The automotive turbine wheels of HK30 stainless steel were prepared by the metal injection molding (MIM). The effects of MIM process parameters on the dimensional stability and mechanical properties of the turbine wheels were investigated. The results show that when the multi-component plastic-based binder formulation is 90%POM +4%PP+2.5%PW+1%SA+2%EVA+0.5%EBS, the molding has the best shape retention. The optimum powder loading (volume fraction) of feedstock is 60%. The melt flow index (MPF) of feedstock is 1 220.7 g/10 min and the sintering shrinkage uniformity of the samples is the optimal. The best injection conditions are the injection temperature of 190 ℃ and the injection pressure of 237.6 MPa. The shape of the injection blank is intact and the quality consistency is the best. The optimum sintering temperature is 1 310 ℃. The turbine blades has the best dimensional stability at 1 310 ℃, and the relative density of the sample is 99.72%, and the tensile strength, yield strength and hardness (HV) are 600 MPa , 289 MPa and 170, respectively.
TANG Zhihao,PAN Chaomei,HE Pengjiang, et al. Dimensional stability and mechanical properties of HK30 stainless steel by metal injection molding[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(4): 313-319.
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2021, Vol. 26 
