Effect of austenitizing temperature on microstructure and properties of 1.2367 hot working die steel

doi:10.13251/j.issn.0254-6051.2023.11.014

Abstract

Abstract: Effect of austenitizing temperature on microstructure and properties 1.2367 hot working die steel was studied by means of thermodynamic calculation, optical microscope, scanning electron microscope, X-ray diffractometer, Rockwell hardness tester and impact testing machine. The results show that the room temperature equilibrium structure of the 1.2367 steel is distributed with M₂₃C₆, M₆C and MC carbides on the ferrite matrix, while when quenched between 1025 ℃ and 1080 ℃, the carbide content gradually decreases and the retained austenite content gradually increases with the increase of austenitizing temperature, and the quenched microstructure is martensite+carbides+retained austenite. After twice rounds of tempering at 615 ℃ for 2 h, the microstructure is tempered martensite+carbides, and with the increase of austenitizing temperature, the hardness gradually increases, with the maximum hardness of 49.05 HRC, but the impact absorbed energy gradually reduces. After quenching at 1050 ℃ and tempering at 615 ℃, the 1.2367 hot working die steel can achieve the best strength and toughness matching.

Key words: 1.2367 hot working die steel, austenitizing temperature, microstructure, properties

CLC Number:

TG113

Du Simin, Chen Wenxiong, Wang Hongli, Hu Fengrong, Ren Jinqiao, Zhou Zhiming. Effect of austenitizing temperature on microstructure and properties of 1.2367 hot working die steel[J]. Heat Treatment of Metals, 2023, 48(11): 90-95.

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