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利用Gleeble-3800热模拟实验机,在变形温度为1000~1200℃、应变速率为1~80 s-1条件下进行恒温、恒应变速率的热压缩实验,测试了高温合金Inconel 690(IN690)的真应力—应变曲线。采用加工硬化率方法,研究了Inconel 690高温合金的动态再结晶临界条件,并引入Zener-Hollomn参数建立了材料的临界应变、临界应力、峰值应变和稳态应变的模型。采用加工硬化率方法确定的动态再结晶发生的临界应变值与Sellars提出的经验模型相吻合。
The hot compression experiments of constant temperature and constant strain rate were carried out with the Gleeble-3800 thermal simulation machine under the condition of deformation temperature of 1000-1200 ℃ and strain rate of 1-80 s-1. The properties of Inconel 690 (IN690) True stress - strain curve. The work hardening rate method was used to study the dynamic recrystallization critical conditions of Inconel 690 superalloy. The critical strain, critical stress, peak strain and steady strain of the material were established by introducing Zener-Hollomn parameters. The critical strain values for dynamic recrystallization, as determined by the work-hardening method, are in agreement with the empirical models proposed by Sellars.