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 M23C6 phase 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.
江旭, 马煜林, 刘越. 回火温度对CB2钢的含硼M23C6相析出及力学性能的影响[J]. 材料导报, 2019, 33(12): 2062-2066.
JIANG Xu, MA Yulin, LIU Yue. Effect of Tempering Temperature on Precipitation and Mechanical Properties of Boron-containing M23C6 Phase in CB2 Steel. Materials Reports, 2019, 33(12): 2062-2066.
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2019, Vol. 33 
