Effect of tempering on microstructure and properties of air cooled bainite steel containing rare earth for oil casing

doi:10.13251/j.issn.0254-6051.2025.01.028

Abstract

Abstract: Effects of addition of rare earth Ce and tempering process on microstructure, precipitation behavior of the second phase and hardness of air-cooled bainite steel for oil casing were compared and studied. The phase transition points of the rare earth and non-rare earth bainite steels were determined by thermal dilatometer, the microstructure and the second phase after tempering were observed and analyzed by using metallographic microscope and TEM, the precipitation behavior of the second phase was simulated by thermodynamic calculation software, and the hardness of the tested steels was tested by using Rockwell hardness tester. The results show that after tempering at 200, 450 and 650 ℃, respectively, for different time, the microstructure of the non-rare earth bainite steel is tempered martensite, tempered troostite and tempered sorbite, respectively, however, the microstructure of the rare earth bainite steel is tempered martensite, tempered troostite and tempered troostite+tempered sorbite, respectively. When tempered at 650 ℃ for 60 min, the second phases in the bainite steels are (Fe, Cr)₃C and Cr₂₃C₆ carbides. With the increase of tempering temperature and time, the hardness of the rare earth and non-rare earth bainite steel decreases overall, while the secondary hardening phenomenon is found when tempered at 450 ℃ for 120 min, and the hardness of the rare earth bainite steel is higher than that of the non-rare earth bainite steel. In conclusion, the addition of rare earth Ce can increase the temperature of the phase transition point, delay the pearlite transformation and improve the hardness of bainite steel.

Key words: air cooled bainite steel, tempering process, oil casing, microstructure and properties, rare earth

CLC Number:

TG156.5

Han Qiang, Gao Zhimin, Jia Xin, Li Tao, Sun Zhaoqi, Dai Congwei. Effect of tempering on microstructure and properties of air cooled bainite steel containing rare earth for oil casing[J]. Heat Treatment of Metals, 2025, 50(1): 180-186.

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