Growing rule and mathematical model of austenite grain in T90 high carbon cord steel

doi:10.13251/j.issn.0254-6051.2023.08.019

Abstract

Abstract: Growth behavior of austenite grains in high carbon wire steel T90 heated at different temperatures (950-1200 ℃) and time (0-600 s) was investigated by high temperature laser confocal microscope, and the effect of different holding temperatures on the microstructure and mechanical properties of the T90 steel was studied. The results show that, at the same heating temperature, the average grain size increases with the prolongation of holding time, but the growth rate is relatively faster between 1150 ℃ and 1200 ℃ and relatively slower between 1050 ℃ and 1100 ℃. Therefore, the heating temperature should be preferably controlled between 1050 ℃ and 1100 ℃. At the same holding time, with the increase of heating temperature, the austenite grains gradually grow, and grain coarsening begins at 1000 ℃. With the increase of heating temperature, the grains merge and grow. Finally, the kinetic equation for the growth of austenite in the T90 steel is obtained.

Key words: T90 high carbon cord steel, austenite, kinetic equation, grain growing

CLC Number:

TG156.1

Zhang Lianyou, Zhao Zhuo, Che An, Li Lingmin, Zhou Yanwen, Chen Xuejiao, Xie Shimian, Lü Zhe. Growing rule and mathematical model of austenite grain in T90 high carbon cord steel[J]. Heat Treatment of Metals, 2023, 48(8): 118-123.

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