Effect of heat treatment on microstructure and precipitates of 5Cr steel with RE addition

doi:10.13251/j.issn.0254-6051.2022.12.009

Abstract

Abstract: Taking 5Cr steel with RE addition as the object, the effect of heat treatment (water quenching at 870, 900, 930 ℃ for 50 min , and then tempering at 670, 690, 710 ℃ for 90 min) on microstructure and second-phase precipitation behavior of the tested steel was studied. The results show that after quenching at 870 ℃, the structure is not completely austenitized. The tested steel is completely austenitized with the increase of quenching temperature, and the prior-austenite average grain size is increased from 13.49 μm at 900 ℃ to 15.01 μm at 930 ℃, while the microstructure uniformity is obviously reduced. By selecting the proper quenching temperature as 900 ℃, and after tempering at 670-710 ℃, the microstructure is tempered troostite, tempered troostite + tempered sorbite and tempered sorbite in turn. The second phases after tempering are Cr₇C₃ carbide distributed on the matrix and Cr₂₃C₆ carbide aggregated at the interface. With the increase of tempering temperature, the proportion of Cr₂₃C₆ carbide increases gradually. In order to avoid the aggregation and coarsening of M₂₃C₆ carbides during tempering, the appropriate tempering temperature is 690 ℃.

Key words: 5Cr steel with RE addition, heat treatment, microstructure, precipitates

CLC Number:

TG162.83

Li Tao, Xu Tao, Han Qiang, Sun Hao, Bai Yansong, Liang Zhanlei. Effect of heat treatment on microstructure and precipitates of 5Cr steel with RE addition[J]. Heat Treatment of Metals, 2022, 47(12): 56-61.

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