Effect of quenching process on microstructure and properties of powder metallurgy martensitic stainless steel

doi:10.13251/j.issn.0254-6051.2022.06.025

Abstract

Abstract: Effect of quenching process on microstructure and mechanical properties of a powder metallurgy ultra-high-carbon stainless steel was studied. After quenching between 900-1200 ℃ and then tempering at 200 ℃, the types of carbide of high carbon and chromium powder metallurgical stainless steel are mainly M₇C₃ and a small portion of MC, with the increase of quenching temperature, the solid solution carbon content in martensite increases, leading to an increase of the hardness and flexural strength. After quenching at 1150 ℃ and the following low-temperature tempering, the mechanical properties reach the best, with hardness of 59 HRC, impact absorbed energy of 18.9 J, flexural strength of 3079 MPa; the carbides are uniformly distributed in the matrix, of which the average size and volume fraction of M₇C₃and MC phase are about 2 μm with 17% and 0.5 μm with 2%, respectively. The volume fraction of retained austenite is 35% after quenching at 1200 ℃, resulting in a decrease in hardness.

Key words: powder metallurgy, quenching temperature, microstructure, mechanical properties, carbide

CLC Number:

TG156

Liu Shaozun, Che Hongyan, Li Ou, Liang Chen, Gui Shun, Wang Tiejun. Effect of quenching process on microstructure and properties of powder metallurgy martensitic stainless steel[J]. Heat Treatment of Metals, 2022, 47(6): 128-132.

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