The recrystallization model and microstructure prediction of alloy 690 during hot deformation
The recrystallization model and microstructure prediction of alloy 690 during hot deformation
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DOI：
10.1016/j.matdes.2016.05.033
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发表时间：
2016-08-15
影响因子：
8.4
通讯作者：
Yao, Zhihao
中科院分区：
文献类型：
--
作者：
Jiang, He;Yang, Liang;Yao, Zhihao
通过在1000-1250 ℃温度范围内、应变速率为0.01 ~ 10 s（-1）的热压缩试验，研究了690合金热变形过程中的再结晶模型和组织演变规律。针对690合金热变形模拟的实际需要，建立了一套包括动态再结晶（DRX）、亚动态再结晶（MDRX）和晶粒长大的综合组织预测模型。通过与真实的制造结果的比较，验证了模型的准确性。此外，为了在热挤压模拟中有效地调用所开发的模型，还利用FORTRAN语言对DEFORM-2D进行了二次开发。模拟的微观组织与工厂实际热挤压过程中获得的690合金管材的微观组织吻合较好，表明所建立的模型可用于热挤压过程的理论指导。(C)2016爱思唯尔有限公司版权所有
The recrystallization model and microstructure evolution during hot deformation of alloy 690 are investigated by the hot compression tests in a temperature range of 1000-1250 degrees C and at strain rates of 0.01-10 s(-1). A series of integrated microstructure prediction models for alloy 690 including dynamic recrystallization (DRX), meta-dynamic recrystallization (MDRX) and grain growth are developed in consideration of the actual requirement of hot deformation simulation. The accuracy of the models is validated using the finite element method (FEM) by comparing the simulation result with real manufactured one. Furthermore, the FORTRAN language is used to carry out secondary development of DEFORM-2D for the effectively invoking of the developed models in the hot extrusion simulation. The simulated microstructure agrees well with the microstructure of alloy 690 pipe obtained from the actual hot extrusion process in the factory, indicating the model developed in present study can be used for theoretical guidance in hot extrusion. (C) 2016 Elsevier Ltd. All rights reserved.