Heat treatment process and microstructure and properties of Q345/40Cr bimetal ring

doi:10.13251/j.issn.0254-6051.2023.03.032

Abstract

Abstract: Rolled Q345/40Cr bimetal rings were quenched at 860-950 ℃ and tempered at 520-610 ℃, the microstructure and properties after heat treatment was observed, analyzed and tested. The results show that the grains are refined after quenching, and coarsened with the increase of quenching temperature. The hardness of the 40Cr steel and hardness of its adjacent bonding layer decreases first and then increases, while the hardness of the Q345 steel decreases slightly, and the hardness of its adjacent bonding layer decreases. The alloying elements in the 40Cr steel side dissolves incompletely when quenched at 860 ℃, and the optimal quenching temperature is 890 ℃. The results of mechanical properties tests show that after 890 ℃ quenching and with the increase of tempering temperature, the tensile strength and hardness of the bimetal ring decrease, the elongation of the Q345 steel and its adjacent bonding layer increases first and then decreases, and the impact property of the bimetal ring is improved. The fracture position of bonding layer is on the side of Q345 steel. The comprehensive performance of the bimetal ring is the best after quenching at 890 ℃ and tempering at 550 ℃, which meets the practical application requirements.

Key words: bimetal ring, quenching temperature, tempering temperature, microstructure, mechanical properties

CLC Number:

TG156

Chang Yaodong, Qi Huiping, Jia Yanlong, Li Yongtang, Wu Yonghong. Heat treatment process and microstructure and properties of Q345/40Cr bimetal ring[J]. Heat Treatment of Metals, 2023, 48(3): 195-202.

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