Article
Chemistry, Physical
Daoguang He, Xintao Yan, Y. C. Lin, Yuchi Xia
Summary: The metadynamic recrystallization (MDRX) characteristics of a Ni-Cr-Mo alloy were investigated using double-pass thermal compression tests. The impacts of double-pass compression parameters on the kinetic features and microstructural changes were clarified. The results showed that the MDRX softening behaviors accelerated with increasing compression temperature, first-pass strain, or strain rate. The bulging of MDRX grain boundary and the annihilation/interaction of substructures weakened at low compression temperature or small first-pass strain, enhancing grain refining during MDRX. However, MDRX grains coarsened rapidly with decreasing strain rate. Based on the comprehensive impact of double-pass compression parameters on softening fraction and grain size, MDRX kinetic model and MDRX grain size model were developed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Bing Zheng, Zhipeng Zou, Dong Xu, Yiqun Wang, Xuexi Wang, Hongyang Zhao, Dongying Ju
Summary: In this study, the metadynamic recrystallization behavior of 34CrNi3MoV steel was investigated through compression and interval experiments. The results showed that fine and uniform grains can be obtained under high strain rates, but mixed crystallization can occur at high temperatures. A metadynamic recrystallization model for 34CrNi3MoV steel was established based on the experimental data, with high predictability.
Article
Materials Science, Multidisciplinary
Shengli Guo, Xiaoyu Zhang, Jun Zhong, Shuaishuai Wu, Wei Jiang
Summary: In this study, the deviation distributions of Sigma 3 and Sigma 9 grain boundaries in a Hastelloy C-276 sheet were measured using EBSD technology. The results showed that the hot rolling process caused significant deviation of Sigma 3 grain boundary orientations and loss of special properties. On the other hand, the Sigma 9 grain boundary plane distribution became more diffused with increasing deformation. Additionally, distorted grain boundaries acted as nucleation sites for dynamic recrystallization during hot rolling.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Dahai Liu, Haorui Chai, Liang Yang, Wenqing Qiu, Zhenghua Guo, Zhilu Wang
Summary: This paper studied the flow stress behavior and recrystallization mechanism of GH5188 superalloy, finding dynamic recrystallization to be the main softening mechanism. EBSD results indicated different recrystallization mechanisms at different temperatures, and twinning played a key role in subgrain refinement at high strain rates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Xintao Yan, Yuchi Xia, Daoguang He, Y. C. Lin
Summary: The microstructural evolution and dynamic recrystallization (DRX) behaviors of a Ni-Cr-Mo alloy were studied using hot compressive experiments. The results showed that increasing the forming temperature enhanced the consumption of dislocation and the coarsening of substructure/DRX grain. However, at higher strain rates, the annihilation/interaction of dislocation and the expansion of subgrain/DRX grain boundary were limited. An improved DRX kinetic model was developed, which accurately characterized the DRX features of the Ni-Cr-Mo alloy across a wide strain rate range. The quantitative statistical results from electron backscatter diffraction (EBSD) demonstrated that the variation of DRX grain size could be described as a power function of the forming temperature and strain rate.
Article
Materials Science, Multidisciplinary
Shaofei Ren, Xiaolong Bai, Sheng Liu, Mingyue Sun, Bin Xu, Chuanyong Cui
Summary: The interface healing mechanism of fine-grained Ni-Co-based superalloy during hot-compression bonding is investigated, and it is found that the defects in the primary gamma' and the bulge of the interface grain boundaries play a crucial role in the interface healing.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2024)
Article
Materials Science, Multidisciplinary
Yusuf Kanca, Mehmet Can Ucgun, Ali Gunen
Summary: The boriding process was applied to improve the wear resistance of Hastelloy C-276 Ni-based superalloy by forming a boride layer on the surface. The boriding treatment resulted in increased hardness and improved wear performance, leading to an extended service life of the material.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Zeynab Aalipour, Abbas Zarei-Hanzaki, Ali Moshiri, Daudi Waryoba, Anna Kisko, L. Pentti Karjalainen, Hamid Reza Abedi
Summary: The dynamic and postdynamic recrystallization behaviors of GWZ magnesium were investigated. Hot compression tests were conducted at a strain rate of 0.001 s(-1) and 400°C with prestrains of 0.1 and 0.5 to study the effect of interpass time on compressive strength. The contribution of the Hall-Petch effect was significant at the lower strain level due to static recrystallization, while at higher strains, the strength decreased with increasing interpass time, attributed to grain growth.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Hongyu Li, Wei Feng, Wuhao Zhuang, Lin Hua
Summary: In this study, thermal hot compression tests were conducted on a Ni-Cr-Co-based superalloy using a Gleeble-3500 thermal simulator. The results showed that both discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) occurred simultaneously during hot deformation. The proposed models accurately described the work-hardening and dynamic softening behaviors, as well as the evolution of dynamic recrystallization grain size in the Ni-Cr-Co-based superalloy.
Article
Materials Science, Multidisciplinary
Rui Wang, Wei Zhang, Yihong Li, Dazhao Li, Yan Kang, Xiaomin Yang, Juergen Eckert, Zhijie Yan
Summary: This study investigated the evolution of microstructure and carbide precipitation in ultra-high carbon steels during the hot deformation compression process. High deformation temperature and strain rate conditions were found to generate flow curve stress peaks leading to dynamic recrystallization. The concentration of primary M7C3 carbides was observed to decrease with increasing deformation temperature, while fine precipitated M23C6 particles were observed in the matrix during hot deformation. Increased concentration of precipitated M23C6 particles was also observed at certain conditions. The recrystallization process was found to vary according to M23C6 particle size.
MATERIALS CHARACTERIZATION
(2021)
Article
Engineering, Manufacturing
Shengli Guo, Shuaishuai Wu, Jiangtao Guo, Yazhao Shen, Wei Zhang
Summary: The hot deformation behavior of Co-Ni-Cr-W-based superalloy was investigated through hot compression tests, revealing that the optimal hot working conditions are 1120-1180 degrees C, 0.08-0.8 s^-1 and strain above 0.5.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Multidisciplinary
Hongyao Yu, Jue Wang, Hailong Qin, Canjin Huang, Tijuan Cheng, Chen Wang, Zhongnan Bi
Summary: The deformation behavior of a new Ni-Co base superalloy GH4251 was studied under hot compression tests. The results show that the flow behavior of the alloy is influenced by work hardening and dynamic recrystallization. The recrystallization mechanism is strain induced grain boundary migration. The grain size is affected by deformation temperature and strain rate, with the presence of gamma ' phase delaying dynamic recrystallization.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Chemistry, Physical
Emil Eriksson, Fabian Hanning, Joel Andersson, Magnus Hornqvist Colliander
Summary: Understanding the microstructural behaviour of materials during thermomechanical processing is crucial for achieving optimal mechanical properties. We investigated the dynamic recrystallization (DRX) behaviour of Ni-base superalloy Haynes 282 during hot compression and observed the formation of small DRX grains before the peak strain. The DRX process accelerated significantly above a certain strain, and the material was fully recrystallized at a higher strain. Contrary to common assumptions, many DRX grains contained dislocation substructures, even at small strains.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Ke Tang, Zhibo Zhang, Jin Tian, Yake Wu, Feng Jiang
Summary: The study on hot deformation behaviors of supersaturated Inconel 783 superalloys revealed the optimal temperature and strain rate range to be 1100-1200 degrees C and near or below 0.1 s(-1) but higher than 0.01 s(-1). The microstructural observation showed that the recrystallized degree and grain size were affected by temperature and strain rate differently.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Hao Cheng, Yong-Cheng Lin, Dao-Guang He, Hong-Bin Li, Zi-Jian Chen, Jun-Cheng Zhu
Summary: The study investigated the hot deformation behavior and microstructure evolution of stress and stress-free aged Ni-Cr-Nb-Mo-Ti alloy through hot compressive tests. It was found that the basket-weave delta-phases refine grains during hot deformation, but significantly hinder the growth of DRX grains and lead to a substantial increase in peak stress. Dislocations pinned near the basket-weave delta-phases can hinder grain boundary migration and accelerate the DRX process during hot deformation.
ADVANCED ENGINEERING MATERIALS
(2021)
