Structural refinement of 00Cr13Ni5Mo2 supermartensitic stainless steel during single-stage intercritical tempering

Da-kun Xu, Yong-chang Liu, Zong-qing Ma, Hui-jun Li, Ze-sheng Yan

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    Da-kun Xu, Yong-chang Liu, Zong-qing Ma, Hui-jun Li, and Ze-sheng Yan, Structural refinement of 00Cr13Ni5Mo2 supermartensitic stainless steel during single-stage intercritical tempering, Int. J. Miner. Metall. Mater., 21(2014), No. 3, pp.279-288. https://dx.doi.org/10.1007/s12613-014-0906-9
    Da-kun Xu, Yong-chang Liu, Zong-qing Ma, Hui-jun Li, and Ze-sheng Yan, Structural refinement of 00Cr13Ni5Mo2 supermartensitic stainless steel during single-stage intercritical tempering, Int. J. Miner. Metall. Mater., 21(2014), No. 3, pp.279-288. https://dx.doi.org/10.1007/s12613-014-0906-9
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    Structural refinement of 00Cr13Ni5Mo2 supermartensitic stainless steel during single-stage intercritical tempering

    • State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Material Science and Engineering, Tianjin University, Tianjin, 300072, China

    基金项目: 

    China National Funds for Distinguished Young Scientists (No. 51325401) for grant and financial support

    the Major State Basic Research Development Program of China (No. 2014CB046805)

      通信作者:

      Yong-chang Liu E-mail: licmtju@163.com

    中文摘要

    The 00Cr13Ni5Mo2 supermartensitic stainless steel was first tempered at 570–730℃ for 2 h to observe the microstructure and hardness changes. The tempering temperature was set to 600, 650, and 700℃, which is below, equal to, and above the austenite transformation start temperature, respectively, for each holding period to investigate the effects of tempering time on the structure and properties of the steel. The microstructure of the specimens was examined by optical microscopy and transmission electronic microscopy, and the phase composition was detected by X-ray diffraction. As expected, lath refinement was observed in the steel tempered at 700℃, and the refinement degree significantly depended on the tempering time. Contrary to normal steel softening by tempering, the hardness performance of the steel was significantly enhanced primarily because of the refinement of martensite laths after single-stage intercritical tempering. It is believed that the reverse transformation of martensite (α′) to austenite (γ) is responsible for the refinement.

     

    Structural refinement of 00Cr13Ni5Mo2 supermartensitic stainless steel during single-stage intercritical tempering

    Author Affilications

      • State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Material Science and Engineering, Tianjin University, Tianjin, 300072, China

    • Funds: 

      China National Funds for Distinguished Young Scientists (No. 51325401) for grant and financial support

      the Major State Basic Research Development Program of China (No. 2014CB046805)

    • Received: 21 September 2013; Revised: 23 November 2013; Accepted: 24 November 2013;
    The 00Cr13Ni5Mo2 supermartensitic stainless steel was first tempered at 570–730℃ for 2 h to observe the microstructure and hardness changes. The tempering temperature was set to 600, 650, and 700℃, which is below, equal to, and above the austenite transformation start temperature, respectively, for each holding period to investigate the effects of tempering time on the structure and properties of the steel. The microstructure of the specimens was examined by optical microscopy and transmission electronic microscopy, and the phase composition was detected by X-ray diffraction. As expected, lath refinement was observed in the steel tempered at 700℃, and the refinement degree significantly depended on the tempering time. Contrary to normal steel softening by tempering, the hardness performance of the steel was significantly enhanced primarily because of the refinement of martensite laths after single-stage intercritical tempering. It is believed that the reverse transformation of martensite (α′) to austenite (γ) is responsible for the refinement.

     

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