Effect of PIP process on properties of powder metallurgy FN04Mo steel

doi:10.13251/j.issn.0254-6051.2025.03.013

Abstract

Abstract: To explore the influence of programable ion permeation (PIP) processes on the properties of FN04Mo steel prepared by metal powder injection molding technology (MIM), the MIM FN04Mo steel was subjected to surface modification treatments under four different PIP time, resulting in four types of specimens with compound layer thicknesses of 5, 10, 15, and 20 μm, respectively. The microstructure, surface hardness, hardness distribution, brittleness, tensile properties, wear resistance, and corrosion resistance of the infiltration layer were characterized and analyzed. The results show that the surface hardness of MIM FN04Mo steel before treatment is 372.99 HV0.1. After being treated by the PIP process, the average surface hardness reaches 510 HV0.1, with an increase of 37%, and the brittleness rating is grade 1. After PIP treatment, with the increase of the thickness of compound layer, the yield strength and tensile strength slightly decrease, while the wear resistance gradually increases. The neutral salt spray test of the specimens after PIP treatment shows that the protection rating R_p is grade 10. The electrochemical test indicates that the impedance of the specimens increases, the self-corrosion potential rises, the self-corrosion current density decreases, and the corrosion resistance improves.

Key words: FN04Mo steel, metal powder injection molding technology (MIM), programable ion permeation (PIP), brittleness, wear resistance, corrosion resistance

CLC Number:

TG156.8

Xiao Yongqiang, Du Guixiang, Zhu Wei, Chen Shengyi, Luo Defu. Effect of PIP process on properties of powder metallurgy FN04Mo steel[J]. Heat Treatment of Metals, 2025, 50(3): 81-89.

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