J. Mater. Sci. Technol. ›› 2024, Vol. 186: 244-255.DOI: 10.1016/j.jmst.2023.11.012

Special Issue: Iron and steel materials 2024

• Research Article • Previous Articles     Next Articles

Effect of austenitizing temperature on martensitic transformation in SA508Gr.4N steel

Shumeng Lua,1, Li Wana,1, Shanju Zhenga,b,*, Mengnie Lia,*, Juanna Rend,e, Baosheng Liud, Manal F. Abou Talebf, Zeinhom M. El-Bahyg, Zhongdong Xub, Xiaojing Wangc,*, Mohamed M. Ibrahimh, Zhanhu Guoe,*   

  1. aFaculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;
    bDepartment of Materials Science and Engineering, Inner Mongolia Zhongsheng Engineering Technology Co., Ltd., Alashan 750300, China;
    cDepartment of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;
    dCollege of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China;
    eDepartment of Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK;
    fDepartment of Chemistry, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Saudi Arabia;
    gDepartment of Chemistry, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt;
    hDepartment of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
  • Received:2023-10-17 Revised:2023-11-15 Accepted:2023-11-17 Published:2024-07-01 Online:2023-12-17
  • Contact: *E-mail addresses: zhengshanju1@163.com (S. Zheng), limengnie@163.com (M. Li), wxj@just.edu.cn (X. Wang), zhanhu.guo@northumbria.ac.uk (Z. Guo).
  • About author:1These authors contributed equally to this work.

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Abstract: SA508Gr.4 N steel is commonly used in nuclear pressure vessels. The current study discloses the impact of austenitizing temperature on its martensitic transformation. Various austenitizing temperatures were employed to examine the martensitic transformation at different experimental conditions. The characteristics of grain boundaries, microstructure, transformation kinetics, and crystallography of the martensitic phase following the austenitizing process and martensitic transformation were analyzed. Austenitizing temperatures had minimal effects on the critical temperature of the austenitizing phase transition. However, an increase in austenitizing temperature resulted in larger grain sizes. The phase composition primarily consisted of lath martensite, accompanied by a small amount of residual austenite (RA). As the austenitizing temperature increased, the temperature of martensite-start temperature (Ms) initially decreased and then increased. On the other hand, the temperature of martensite-finish (Mf) showed no significant sensitivity to changes in the austenitizing temperature. Moreover, the average size of the lath martensite structure was increased, and there was an increased tendency for variant selection as the austenitizing temperature increased, and the combination of specific orientation relationships appeared. This study is very valuable for revealing the microstructure evolution at different temperatures.

Key words: SA508Gr.4 N steel, Austenitizing temperature, Martensitic transformation, Microstructures characteristics

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