粉末装载量对金属注射成形17-4PH不锈钢力学性能的影响

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Abstract The binder composition POM (polyformaldehyde) in the injection molded 17-4PH stainless steel body was catalytically degreased under nitric acid atmosphere, and then thermal degreasing and sintering were carried out in a vacuum sintering furnace. The effects of powder loading and catalytic degreasing time on the catalytic degreasing rate were studied, and the effects of powder loading on the microstructure, density and tensile strength of sintered products were also studied. The results show that the microstructure of the sintered products is composed of austenite and a small amount of ferrite. With increasing the powder loading from 55.1% to 65.7%, the catalytic degreasing rate of the sintered sample decreases from 7.8% to 5.2%; the density increases from 7.56 g/cm³ to 7.66 g/cm³, and the tensile strength increases from 1 076 MPa to 1 204 MPa. With increasing the thermal retention time from 30 min to 90 min at 130 ℃, the catalytic degreasing rate increases from 4.9% to 6.7%. When the thermal retention time in the range of 90-150 min, the catalytic degreasing rate stabilise at about 6.7%. With the powder loading of 65.7%, the POM in the binder can be completely removed by 90min catalytic degreasing. The degreasing rate reaches 87%, and the injection blank forms a complete communicating channel.

Key words： 17-4PH stainless steel powder loading catalytic degreasing tensile strength

Received: 17 March 2017 Published: 11 July 2019

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	YU Jian
	LI Yimin
	LI Dongyang
	LI Xing

Cite this article:

YU Jian,LI Yimin,LI Dongyang, et al. Effect of powder loading on mechanical properties of metal injection molding 17-4PH stainless steel[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(1): 32-37.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I1/32

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