氮气烧结金属注射成形17-4PH不锈钢的组织与性能

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Abstract MIM 17-4PH stainless steel was prepared at 1 260, 1 290 and 1 305 ℃ using nitrogen sintering technology in the whole process. The microstructure and properties of the stainless steel were tested and analyzed, which were compared with MIM 17-4PH stainless steel prepared by conventional sintering process of vacuum and argon sintering. The results show that the MIM 17-4PH sintering in a nitrogen atmosphere throughout the process facilitates the nitriding effect. Compared to the conventional sintering process with vacuum and argon, the whole sintering process under nitrogen decreases its relative density, while the grains are obviously refined and new microstructure appears. Meanwhile, the content of austenite in sintered stainless steel decreases with the increase of sintering temperature. 1 290 ℃ is the best temperature to make sample possess relatively higher densification, better nitriding effect, refined grain size, and uniform distribution of fine second phase. The nitrogen sintering improves the comprehensive mechanical properties compared with vacuum and argon sintering. The tensile strength increases from 900 MPa to 1 158 MPa. The elongation increases from 6% to about 10%, and cross-sectional hardness (HRC) increases from 20.2 to 28.0.

Key words： nitrogen sintering metal injection molding (MIM) 17-4PH microstructure mechanical properties plasticity

Received: 20 April 2020 Published: 18 September 2020

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	WANG Yue
	LI Ruidi
	YUAN Tiechui

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WANG Yue,LI Ruidi,YUAN Tiechui. Microstructure and properties of MIM 17-4PH stainless steel prepared by nitrogen sintering process[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(4): 304-311.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I4/304

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