A Physically Based Dynamic Recrystallization Model Considering Orientation Effects for a Nitrogen Alloyed Ultralow Carbon Stainless Steel during Hot Forging

作     者：Gan-lin XIE An HE Hai-long ZHANG Gen-qi WANG Xi-tao WANG 

作者机构：State Key Laboratory for Adwmced Metals and MaterialsUniversily of Science and Technology BeijingBeijing 100083China Yantai Taihai Manoir Nuclear Power Equipment CorporationYantai 264003ShandongChina Collaborative Innovation Center of Steel TechnologyUniversily of Science and Technology BeijingBeijing 100083China 

出 版 物：《Journal of Iron and Steel Research International》 (钢铁研究学报(英文版))

年 卷 期：2016年第23卷第4期

页      面：364-371页

核心收录：

学科分类：080503[工学-材料加工工程] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

基　　金：Item Sponsored by National High-tech Research and Development Program of China(2012AA03A507,2012AA050901) National Science and Technology Major Project of China(2011ZX06004) 

主　　题：stainless sled dynamic recrystallization hot forging EBSD orientation effect 

摘      要：The nitrogen alloyed ultralow carbon stainless steel is a good candidate material for primary loop pipes of AP1000 nuclear power plant. These pipes arc manufactured by hot forging, during which dynamic recrystallization acts as the most important microstructural evolution mechanism. A physically based model was proposed to describe and predict the microstructural evolution in the hot forging process of those pipes. In this model, the coupled effects of dislocation density change, dynamic recovery, dynamic recrystallization and grain orientation function were con sidered. Besides, physically based simulation experiments were conducted on a Gleeble 3500 thermo-mcchanical sire ulator, and the specimens after deformation were observed by optical metallography （OM） and clectron back scat toted diffraction （EBSD） method. The results confirm that dynamic recrystallization is easy to occur with increasing deformation temperature or strain rate. The grains become much finer after full dynamic recrystallization. The model shows a good agreement with experimental results obtained by OM and EBSD in terms of stress strain curves, grain size, and recrystallization kinetics. Besides, this model obtains an acceptable accuracy and a wide applying scope for engineering calculation.