回火温度对CB2钢的含硼M<sub>23</sub>C<sub>6</sub>相析出及力学性能的影响

doi:10.11896/cldb.18040219

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Abstract In order to study the influence of the precipitation behavior of boron-stabilized M₂₃C₆ phase on the mechanical properties, the CB2 steel containing boron was tempered at 690 ℃, 710 ℃, 730 ℃, 750 ℃, 770 ℃ and 790 ℃, respectively. The precipitation behavior of boron-stabilized M₂₃C₆ phase at tempering temperature from 690 ℃ to 790 ℃ was observed by OM, SEM and TEM. The effect of tempering temperature on the precipitation behavior of M₂₃C₆phase was clarified by means of Thermo-Calc. Combined with hardness and room temperature stretching perfor-mance test, the influence law of precipitation behavior of M₂₃C₆ phase in CB2 steel on performance was studied to determine the best tempering temperature. The results show that as the tempering temperature increases, martensite in CB2 steel gradually broadens and martensite lath changes to ferrite. The average size of M₂₃C₆ phase increased from 132.19 nm to 197.62 nm. When the tempering temperature exceeded 750 ℃, the increase of M₂₃C₆ accelerated obviously. The strength and hardness of CB2 steel decreased, while the elongation and reduction of area increased. When the tempering temperature was 730 ℃, CB2 steel had better overall performance.

Key words： metallic materials M₂₃C₆ phase tempering temperature martensite heat resistant steel

Published: 31 May 2019

CLC number:

TG27

Fund:This work was financially supported by the National Natural Science Foundation of China (51334004), Major Science and Technology Project of Liaoning Province (201404001).

About author:: Xu Jiangreceived his M.S. degree in January 2019 from Northeastern University in engineering. From June 2016 to January 2019, He studied at Northeastern University, focusing on the research of the heat treatment new ferritic heat-resistant steel.Yue Liu,professor, School of Materials, Northeastern University, Ph.D. The main research direction is the application research of high performance metal matrix composites, metal wear resistant materials and preparation technology.

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Cite this article:

JIANG Xu,MA Yulin,LIU Yue. Effect of Tempering Temperature on Precipitation and Mechanical Properties of Boron-containing M₂₃C₆ Phase in CB2 Steel[J]. Materials Reports, 2019, 33(12): 2062-2066.

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http://www.mater-rep.com/EN/10.11896/cldb.18040219 OR http://www.mater-rep.com/EN/Y2019/V33/I12/2062

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