Dynamic recrystallization behavior of GH4169G alloy during hot compressive deformation |
| |
| Affiliation: | 1. University of Chinese Academy of Sciences, Beijing, 100049, China;2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Shanghai Power Equipment Research Institute, Shanghai 200240, China;1. Education Ministry Key Laboratory of Advanced Forging & Stamping Technology and Science, Yanshan University, Qinhuangdao 066004, China;2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;1. State Key Lab of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China;2. State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi''an, 710077, China;3. Analytical & Testing Center, Northwestern Polytechnical University, Xi’an, 710072, China;1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an, 710072, PR China;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China |
| |
| Abstract: | The microstructure evolutions and nucleation mechanisms of GH4169 G alloy were studied by optical microscope, electron backscatter diffraction (EBSD) and transmission electron microscope (TEM). The hot compression tests were performed different imposed reductions in the range of true strain from 0.12 to 1.2 at the temperatures of 930 ℃-1050 ℃ with strain rates of 0.01 s?1-1 s?1. It is found that cumulative and local misorientation increase firstly and then decrease when the strain is increased due to the progress of dynamic recrystallization (DRX). The low angle boundaries (LAGBs) rapidly develop to high angle boundaries (HAGBs) at relatively high deformation temperature or the low strain rate. There are three DRX mechanisms observed for GH4169 G alloy during hot deformation. Discontinuous dynamic recrystallization (DDRX) as the dominant mechanism for GH4169 G alloy is characterized by typical necklace structures and bulged-original boundaries. Besides, different deformation bands with dislocation cells formed in deformed matrix at low temperature and large strain, which indicates that continuous dynamic recrystallization (CDRX) contributed to the DRX process. The twin boundaries lost their coherent characteristics and provide sites for nucleation, which also accelerates the nucleation of DRX. |
| |
| Keywords: | GH4169G alloy Dynamic recrystallization Nucleation mechanism |
| 本文献已被 万方数据 ScienceDirect 等数据库收录！ |
|
