Effect of forging heating temperature on austenite grain growth and mechanical properties of 20Cr2Ni4A steel

doi:10.13251/j.issn.0254-6051.2022.02.020

Abstract

Abstract: Effects of forging heating temperature (1050-1200 ℃) and holding time (40-120 min) on grain growth behavior of austenite of the 20Cr2Ni4A steel with same forging deformation were studied, and the mechanical properties of the quenched 20Cr2Ni4A steel at different forging temperatures were tested. The results show that the austenite grain growth law of the 20Cr2Ni4A steel after forging still conforms to the Beck model when the forging temperature is lower than 1150 ℃, and the model calculated value is consistent with the actual measured value. As the forging heating temperature increases, the growth of austenite grains shows a law of increasing slowly and then rapidly. When the forging heating temperature exceeds 1150 ℃, a large number of second phase particles dissolve and the pinning effect on grain boundaries decreases sharply. Considering the austenite grain size uniformity after forging, mechanical properties test results after heat treatment and forgeability factors of the 20Cr2Ni4A steel, the optimal forging heating temperature is 1150 ℃.

Key words: 20Cr2Ni4A steel, forging heating temperature, holding time, grain size, mechanical properties

CLC Number:

TG142.1

Chen Jianwen, Yuan Wufeng, Jiang Yizhou, Zhang Chen, Yi Huaqing, Gao Yiqiang. Effect of forging heating temperature on austenite grain growth and mechanical properties of 20Cr2Ni4A steel[J]. Heat Treatment of Metals, 2022, 47(2): 112-118.

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