论文部分内容阅读
用Gleeble-3800热模拟试验机研究了铸态耐热合金CN617退火后在形变温度1050~1180℃,应变速率0.01~10 s-1条件下的热变形行为,建立了该合金的热变形本构方程,绘制了热加工图。结果表明,在形变温度1050~1180℃,应变速率0.01~1 s-1条件下,CN617合金的热变形曲线呈现稳态的流变应力;当在形变温度1100~1180℃,应变速率10 s-1条件下,其热变形行为表现为持续硬化+动态软化过程。CN617合金热变形的热激活能平均为502.35 k J/mol。在形变温度1050~1125℃,应变速率0.2~10 s-1时形成流变失稳。其原因是动态再结晶程度较低,流变应力较高。
The thermal deformation behavior of as-cast heat-resistant alloy CN617 after annealing at deformation temperature of 1050 ~ 1180 ℃ and strain rate of 0.01 ~ 10 s-1 was studied by Gleeble-3800 thermal simulation tester. The thermal deformation constitutive Equation, drawn hot working diagram. The results show that the thermal deformation curves of CN617 alloy show steady flow stress under the condition of strain rate of 1050 ~ 1180 ℃ and strain rate of 0.01 ~ 1 s-1. When the deformation temperature is 1100 ~ 1180 ℃ and the strain rate is 10 s- 1 conditions, the thermal deformation behavior of continuous hardening + dynamic softening process. The heat activation energy of CN617 alloy was 502.35 kJ / mol on average. The rheological instability is formed when the deformation temperature is 1050 ~ 1125 ℃ and the strain rate is 0.2 ~ 10 s-1. The reason is that the degree of dynamic recrystallization is lower and the flow stress is higher.