Effect of tempering temperature on microstructure and mechanical properties of N63 steel

doi:10.13251/j.issn.0254-6051.2023.07.014

Abstract

Abstract: Effect of tempering temperature on mechanical properties and microstructure of the N63 steel was studied by means of scanning electron microscopy, transmission electron microscopy and so on. The results show that the N63 steel hardly generates reverse austenite after tempering, and has good tempering resistance. The main precipitated phase of the N63 steel after low tempering at 260-600 ℃ is ε-carbide. When the tempering temperature rises to around 480 ℃, M₂C carbide is precipitated from the matrix, and the tensile strength and yield strength reach the peak value of 1483 MPa and 1138 MPa, respectively. Then, the strength decreases rapidly with the increase of tempering temperature. The precipitated phase consists of cementite and M₂₃C₆ at 600 ℃, and the decomposition of martensitic matrix laths of N63 steel is serious whose tensile strength drop to only 1009 MPa. The impact absorbed energy decreases first, then increases and then decreases with the tempering temperature, which reaches the lowest value of 79 J when tempering at 420 ℃. Based on the microstructure and mechanical properties at different tempering temperature, N63 steel has excellent matching of strength and toughness when tempered at 480 ℃.

Key words: N63 steel, tempering, mechanical property, microstructure, M₂₃C₆

CLC Number:

TG142.2

Han Shun, Li Gang, Yang Hao, Li Xinyang, Li Yong, Wang Chunxu. Effect of tempering temperature on microstructure and mechanical properties of N63 steel[J]. Heat Treatment of Metals, 2023, 48(7): 79-83.

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