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利用TC21合金的高温热压缩试验数据,建立了动态再结晶位错理论和唯象理论两种数学本构模型。在DEFORM-3D软件平台上,基于两种数学模型,对合金在准β温度(975℃)下进行热压缩变形模拟。结果表明,坯料在大变形区域动态再结晶较充分,晶粒尺寸较其他区域小,与试验所测晶粒尺寸对比,相对误差在10%以内;并且在同一变形区域,随着应变速率提高,坯料内部平均晶粒尺寸不断变小。对比金相组织可知,CA组织模拟较准确地反映了坯料的变形规律。
Using TC21 alloy hot compression test data, two mathematical constitutive models of dynamic recrystallization dislocation theory and phenomenological theory were established. On the DEFORM-3D software platform, based on two mathematical models, the hot deformation simulation of the alloy is carried out at the quasi-β temperature (975 ℃). The results show that the dynamic recrystallization of the billet in the large deformation zone is more complete and the grain size is smaller than that in the other zones. The relative error is less than 10% compared with the measured grain size. In the same deformation zone, as the strain rate increases, The average grain size of the billet keeps getting smaller. Compared with the microstructure, it can be seen that the CA tissue simulation accurately reflects the deformation of the billet.