在变形温度800～1200℃和应变速率0.01～50 s~(-1)下,利用Gleeble-3800热模拟试验机对Aermet100钢的高温变形本构关系与微观组织演变进行了研究.结果表明,增加应变速率和降低变形温度都能提高材料的流动应力,延迟动态再结晶发生,使变形材料表现出加工硬化和动态回复.运用位错理论研究了微观组织和流动应力曲线的变化规律并做出了合理的解释.在压缩实验的变形条件下变形激活能为489.10 kJ/mol.确定了峰值应力、变形温度和应变速率之间的双曲正弦模型的本构关系.
High-temperature deformation constitutive relationship and microstructure evolution in Aermet100 steel were investigated with compression tests at deformation temperatures of 800 ～ 1200 ℃ and atrain rates of 0.01 ～ 50 s~(-1) on a Gleeble-3800 thermo-mechanical simulator.Results show that increasing strain rate and decreasing deformation temperature can make the flow stress increase, hamper the occurrence of dynamic recrystallization, and promote the occurrence of work hardening and dynamic recovery in deformation metals.The change law of microstructure and stress-strain curves was investigated using dislocation theory, and reasonable explanation of it was made.The deformation activation energy of Aermet100 steel under the deformation conditions of the compression tests was determined as Q = 489.10 kJ/mol.The constitutive relationship between peak stress, strain rate and deformation temperature was established by means of the conventional sinh model.
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