金属注射成形HK30不锈钢的尺寸稳定性与力学性能

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摘要采用金属注射成形工艺制备HK30不锈钢车用增压涡轮,研究金属注射成形工艺参数对增压涡轮尺寸稳定性及力学性能的影响。结果表明,采用成分为90%POM+4%PP+2.5%PW+1%SA+2%EVA+0.5%EBS (质量分数)的多组元塑基黏结剂时,成形件具有最佳的保形性;喂料的最佳粉末装载量(体积分数)为60%,此时喂料的熔融流动指数为1 220.7 g/10 min,烧结收缩均匀性最佳;最佳的注射条件为注射温度190 ℃、注射压力为237.6 MPa,所得增压涡轮注射坯的形状完好且质量一致性最好;最佳烧结温度为1 310 ℃,此时涡轮各叶片的尺寸稳定性最佳,合金的相对密度达到99.72%,抗拉强度和屈服强度分别为600 MPa和289 MPa,硬度(HV)为170。

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	汤志豪
	潘超梅
	何鹏江
	罗浩
	宋信强
	曾克里

关键词 ：金属注射成形, HK30不锈钢, 增压涡轮, 尺寸稳定性, 力学性能

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.

Key words： metal injection molding HK30 stainless steel turbine wheel dimensional stability mechanical properties

收稿日期: 2021-01-06 出版日期: 2021-09-26

ZTFLH:

TF124

基金资助:国家重点研发计划资助项目(2018YFB1106000)

通讯作者: 曾克里,教授级高级工程师。电话：13928867032;E-mail: 13928867032@139.com

引用本文:

汤志豪, 潘超梅, 何鹏江, 罗浩, 宋信强, 曾克里. 金属注射成形HK30不锈钢的尺寸稳定性与力学性能[J]. 粉末冶金材料科学与工程, 2021, 26(4): 313-319.
TANG Zhihao, PAN Chaomei, HE Pengjiang, LUO Hao, SONG Xinqiang, ZENG Keli. Dimensional stability and mechanical properties of HK30 stainless steel by metal injection molding. Materials Science and Engineering of Powder Metallurgy, 2021, 26(4): 313-319.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2021/V26/I4/313

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