Effect of C content on microstructure and  mechanical properties of HT9 steel

doi:10.13251/j.issn.0254-6051.2023.12.042

Abstract

Abstract: Effect of carbon content change on the microstructure and mechanical properties of HT9 steel was studied by means of optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and tensile testing machines. The results show that the change of C content has a significant impact on the content of carbides and properties. With the increase of C content, the Ni_eq increases, which inhibits the precipitation of δ-Fe; the C also promotes the precipitation of M₂₃C₆ carbides, hinders the migration of martensitic laths, and leads to lath refinement, precipitation strengthening and interface strengthening, which increases the strength and hardness of the steel and reduces the plasticity and toughness of the material. When the C content is in the range of 0.17%-0.20%, this change is the most significant, which is mainly related to the precipitation of solute atoms in the steel and the decline of solution strengthening effect.

Key words: HT9 steel, M₂₃C₆, δ-Fe, mechanical properties, microstructure

CLC Number:

TG142.1

Xie Pu, Zhao Jiqing, Yan Tingting. Effect of C content on microstructure and mechanical properties of HT9 steel[J]. Heat Treatment of Metals, 2023, 48(12): 255-259.

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Effect of C content on microstructure and mechanical properties of HT9 steel

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