Article
Materials Science, Multidisciplinary
Yeqing Cai, Song Xiang, Yuanbiao Tan
Summary: The dynamic recrystallization behavior of MP159 superalloy was studied through hot compression tests, identifying the optimal hot processing region and investigating the influence of processing parameters on microstructure evolution. Deformation twins formed during hot deformation can accelerate dynamic recrystallization.
METALS AND MATERIALS INTERNATIONAL
(2022)
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
Qiu-Mei Yang, Yong-Cheng Lin, Ming-Song Chen, Zi-Jian Chen
Summary: The features and evolution of microstructure of a new HIPed P/M superalloy are investigated through hot-compression tests. The study reveals the significant influence of deformation conditions on dynamic recrystallization (DRX) features and grain-growth behavior.
Article
Materials Science, Multidisciplinary
Hao Shiming, Liu Pengru, Xie Jingpei
Summary: The present study investigates the hot deformation of 35%SiCp/2024Al composite using Gleeble-1500D thermo-mechanical simulators. It is found that the flow stress, microstructure evolution, and deformation mechanism are sensitive to deformation parameters, which can be represented by the Zener-Hollomon parameter (Z) in the hyperbolic sine equation. The softening mechanism, degree of dynamic recrystallization, average grain size, size of precipitates, dislocation density, and nucleation mechanism of dynamic recrystallization are influenced by the Z parameter, and the interaction laws are obtained through analysis.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Chao Cui, Jian He, Wenke Wang, Wenzhen Chen, Wencong Zhang, Xuemin Chen, Jiabin Hou
Summary: Uniaxial compression experiments were conducted on as-extruded AZ31 Mg alloy at different temperatures, revealing the significant influence of temperature on grain size, proportion of DRXed grains, and texture formation. The appearance of abundant twins at 250°C promoted the formation of strong CD texture, while the transformation of DRX types from continuous to discontinuous with increasing temperature affected the texture evolution of the material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Leli Chen, Hengnan Ding, Tian Liu, Rui Luo, Yun Cao, Yuanxiang Zhang, Yu Liu, Fei Yuan, Yu Qiu, Shugang Cui, Yu Cao, Xiaonong Cheng
Summary: The shear-compression deformation behavior of GH4169 superalloy was investigated at different temperatures and strain rates, revealing different dynamic recrystallization mechanisms and microstructural evolution in different regions. The maximum stress decreased with increasing temperature and decreasing strain rate, reflecting the unique characteristics of the material's deformation and recrystallization.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Tian Liu, Xiaonong Cheng, Hengnan Ding, Leli Chen, Qian Wang, Di Zhang, Rui Luo
Summary: The effect of strain on the microtexture and recrystallization of the GH4169 alloy was investigated using EBSD. The strain gradually increases from the edge to the center of the compressed sample, leading to increased recrystallization. The generation of new sigma 3 boundaries within the DRX grains affects the deformation microstructure, resulting in a decrease in the overall maximum intensity of the microtexture.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Qiu-Mei Yang, Yong-Cheng Lin, Jian-Zheng Guo, Chao Wang, Zi-Jian Chen, Kai-Ge Chen, Jun-Cheng Zhu
Summary: This study investigates the spheroidization behavior of the gamma' phase and the dynamic recrystallization (DRX) mechanisms of a novel HIPed powder metallurgy superalloy under different deformation conditions. The results indicate that the deformation conditions greatly influence the spheroidization behavior of the gamma' phase and DRX mechanisms.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Chihui Liu, Hua Zhang, Qing Wang, Panzhi Wang, Jiadian Yang, Fanchao Meng, Xin Zhou, Lilong Zhu, Shangzhou Zhang, Liang Jiang
Summary: Thermal deformation behavior and microstructure evolution of GH141 alloy were efficiently studied using high-throughput double-cone gradient compression. Different compression temperatures resulted in a wide gradient equivalent strain distribution and gradient microstructure. The dynamic recrystallization mechanism shifted towards discontinuous dynamic recrystallization with increasing compression temperature.
Article
Materials Science, Multidisciplinary
Le Chen, Bing Zhang, Yan Yang, Tianli Zhao, Yi Xu, Qi Wang, Bin Zan, Jun Cai, Kuaishe Wang, Xi Chen
Summary: Nickel-based superalloy has excellent mechanical properties at high temperature, but the high deformation resistance, narrow deformation temperature range, and complex microstructure evolution of the alloy pose great challenges to its plastic deformation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Zhaoning Xu, Liujie Xu, Ning Xiong, Yuan Yao, Xiuqing Li, Shizhong Wei
Summary: In this study, the high-temperature deformation process of molybdenum alloy reinforced by 2.0%ZrO2 was investigated, and the microstructure evolution was analyzed. The relationship between deformation temperature, strain rate, and flow stresses was established. The research found that the alloy mainly undergoes dynamic recrystallization at high temperatures and low strain rates, with partial dynamic recrystallization occurring at high strain rates and low temperatures. Additionally, the alloy has low activation energy, making it suitable for hot working, and exhibits two typical textures after high temperature deformation.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Engineering, Mechanical
Caiyi Liu, Silvia Barella, Yan Peng, Shuo Guo, Shicheng Liang, Jianliang Sun, Andrea Gruttadauria, Marco Belfi, Carlo Mapelli
Summary: The flexible rolling with variable deformation states poses new challenges to the conventional dynamic recrystallization (DRX) theory based on constant deformation state. In this study, modeling and characterization of DRX were investigated using constitutive models and EBSD technique, combined with flow stress characteristics. Two constitutive models for constant and transient deformation states were considered, and the dynamic recovery effect was integrated to predict the flow stress and DRX volume fraction. A hot processing map was established to predict the instability region, and various DRX synergistic regulation mechanisms and crystallographic orientation distribution were explored under transient deformation state.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Ya Tang, Daihong Xiao, Lanping Huang, Renxuan You, Xinyue Zhao, Nan Lin, Yunzhu Ma, Wensheng Liu
Summary: The study reveals that compression temperature significantly influences the characteristic and dynamic behavior of secondary phases in Al-Cu-Li alloy during hot deformation. Proper strain rates can accelerate the formation and growth of T-1 phase, but at higher temperatures, T-1 phase may completely dissolve into the matrix.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Ya Tang, Daihong Xiao, Lanping Huang, Renxuan You, Xinyue Zhao, Nan Lin, Yunzhu Ma, Wensheng Liu
Summary: In this study, the evolution of deformation microstructures and multiscale phases in Al-Cu-Li alloy was investigated under different temperatures and strain rates. The results showed that the compress temperature has an impact on the characteristic and dynamic deformation behaviors of secondary phases. Proper strain rates can promote the formation and growth of multistage banded T-1 phase.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Xingyu Pan, Chonglin Jia, Zhiyong Ji, Chunlei Qiu
Summary: Direct hot forging of heavily-alloyed Ni-based superalloy castings often leads to cracking due to macro-segregation. To solve this problem, hot extrusion is proposed as an alternative technology for processing these superalloys. In this study, a cast and wrought Ni-based superalloy GH4151 was successfully processed by hot extrusion without cracking, and extensive twinning played a crucial role in accommodating plastic deformation. Dynamic recrystallization occurred, resulting in significant grain refinement. The hot-extruded GH4151 exhibited superior mechanical properties compared to state-of-the-art disc superalloys and could be further improved with heat treatment.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
