23Cr-8Ni钢热变形行为及工艺图

Hot Deformation Behavior and Processing Map of 23Cr-8Ni Steel

摘要:

采用Gleeble 3500热力模拟试验机，研究了23Cr-8Ni钢在1000~1250 ℃和0.001~10 s^-1条件内的热变形行为。分析了表征区域的微观结构，研究了23Cr-8Ni钢的再结晶行为。结果表明：随着应变的降低和变形温度的升高，流变应力明显减小。由于峰值应力之后出现软化现象，流变应力减小。应力指数（n）为4.28，热变形活化能（Q）为588 878 J/mol。构建了热工艺图，获得了最佳热加工范围为0.001~0.1 s^-1和 1000~1200 ℃。采用最佳热加工工艺，成品率大大提高。

Abstract:

Using a Gleeble 3500 thermomechanical simulation testing machine, the hot deformation characteristics of 23Cr-8Ni steel were investigated under the conditions of 1000–1250 °C and 0.001?10 s^-1. Furthermore, the microstructure of the characterization region was analyzed to investigate the recrystallization behavior of 23Cr-8Ni steel. Results show that as the strain rate decreases and the deformation temperature increases, the flow stress decreases. Because the softening phenomenon occurs after the peak stress, the flow stress decreases. The stress index (n) is 4.28, and the thermal deformation activation energy (Q) is 588 878 J/mol. Processing map is established, and an optimal thermal processing range of 0.001–0.1 s^-1 and 1000–1200 °C is achieved, therefore greatly promoting the yield rate.