Effect of heat treatment process on carbide precipitation in high Co and high V high-speed steel PM60

doi:10.13251/j.issn.0254-6051.2024.03.012

Abstract

Abstract: Compared with ordinary high speed steels, PM60 high-speed steel prepared by powder metallurgy contains a large amount of Co element, which can promote the precipitation of secondary carbides. The PM60 high-speed steel was quenched at 1120, 1150, 1180 and 1210 ℃, and oil cooling, and then tempered three times at 540, 560 and 580 ℃. After the heat treatment, the microstructure, precipitated phases, and hardness of the PM60 high speed steel after heat treatment were analyzed by metallographic microscope, scanning electron microscope, and Rockwell hardness tester. The types, morphology, composition, distribution, and precipitation behavior of the carbides in the samples before and after heat treatment were investigated by using JMatPro thermodynamic calculation software. The results show that the original precipitation phases are MC, M₆C, M₂₃C₆and M₇C₃ phases, after heat treatment, the precipitation phases are MC and M₆C phases. By energy spectrum analysis, two types of carbides are found: the dark V-rich carbides, and the bright W and Mo-rich carbides. In the quenching process, part of the carbides is dissolved, and in the tempering process, there is fine dispersive secondary carbides precipitated out. Under the condition of quenching at 1180 ℃+tempering at 540 ℃, the hardness of the tested steel is the highest.

Key words: PM60 high-speed steel, powder metallurgy, carbides, heat treatment, precipitation

CLC Number:

TG161

Yin Jinhua, Zhu Bailin, Hu Mulin, Peng Hui. Effect of heat treatment process on carbide precipitation in high Co and high V high-speed steel PM60[J]. Heat Treatment of Metals, 2024, 49(3): 68-76.

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