利用Gleeble-3500热模拟试验机研究了T122耐热钢在900—1200 ℃,应变速率为10 -2—10 1 s -1 条件下的热压缩变形行为. 采用应变硬化速率-应力 (θ-σ)曲线图较精确地 获得了饱和流变应力和峰值应力； 用回归法确定了双曲线本构方程中的变形激活能及材料常 数, 确定了T122钢在饱和应力和峰值应力条件下的变形激活能 分别为570和548 kJ/mol；采用 力学方法直接从流变曲线确定了T122 钢发生动态再结晶的临界应变量, 并回归出临界应变 量与Zener-Hollomon参数的关系式.
The hot deformation behavior of the heat resistant steel T122 was investigated with a compression test on Gleeble 3500 simulator at a temperature range of 900--1200 ℃ and strain rate range of 10 -2—10 1 s -1. A method was developed to determine the activation energy and material parameters in the hyperbolic sine constitutive equation. The activation energies determined are 570 kJ/mol and 548 kJ/mol for steel T122 in saturation stress and peak stress, respectively. The values of critical strain for dynamic recrystallization (DRX) initiation was determined from the strain-stress curves, a equation related to the Zener-Hollomon parameter was obtained.
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