Heat Treatment of Metals ›› 2023, Vol. 48 ›› Issue (4): 166-172.DOI: 10.13251/j.issn.0254-6051.2023.04.027

• PROCESS RESEARCH • Previous Articles     Next Articles

Elevated temperature plastic deformation behavior of Y12Cr18Ni9Cu austenitic free-cutting steel

Wang Yinghu1,2, Jin Lei3   

  1. 1. Chengdu Institute of Advanced Metallic Material Technology and Industry Co., Ltd., Chengdu Sichuan 610000, China;
    2. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan Liaoning 114009, China;
    3. Jiangyou Changcheng Special Steel Co., Ltd. of Pangang Group, Jiangyou Sichuan 621704, China
  • Received:2022-05-22 Revised:2022-11-29 Online:2023-04-25 Published:2023-05-27

Abstract: In order to study the elevated temperature mechanical properties of the Y12Cr18Ni9Cu austenitic free-cutting steel, the tested steel was subjected to elevated temperature tensile test at different temperatures by Gleeble-3500 simulator, then the fracture morphology, tensile strength and percentage reduction of area were analyzed. The results show that the elevated temperature tensile strength of the tested steel gradually decreases, while the percentage reduction of area gradually increases with the increase of testing temperature. The low temperature brittle range of the tested steel is 800-900 ℃, and there is no high temperature brittle range. The emergence of low temperature brittle range is due to the fact that the material does not undergo dynamic recrystallization during hot deformation and the different deformation capacities of sulfide and matrix, so that cracks are generated at the interface between sulfide and matrix, eventually leading to brittle fracture. In the temperature range of 1150-1250 ℃, the tested steel undergoes dynamic recrystallization and exhibits excellent elevated temperature thermoplasticity. The optimum hot working temperature of the Y12Cr18Ni9Cu austenitic free-cutting steel should be selected at 1150-1250 ℃.

Key words: Y12Cr18Ni9Cu free-cutting steel, elevated temperature strength and plasticity, Thermo-Calc software, percentage reduction of area, sulfide

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