Article
Chemistry, Physical
Rong Kong, Bao Meng, Xin Ma, Youchun Li, Lihuang Zheng, Yu Zhu, Min Wan
Summary: The hot deformation behavior and microstructural evolution of Inconel 625 superalloy sheet under different conditions were investigated. The plastic flow behavior of the Inconel 625 sheet changes from work hardening to hot softening with the rise of experimental temperature and the decline of strain rate. The optimal hot working window appears at the temperature range of 925 and 950 degrees C and the strain rate between 0.001 and 0.1 s-1 with the power dissipation efficiency of about 46.5%.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
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
Huiwei Li, Xiaoli Zhuang, Song Lu, Stoichko Antonov, Longfei Li, Qiang Feng
Summary: The thermal deformation behavior and flow stress modeling of a novel CoNi-based wrought superalloy were investigated at different temperatures and strain rates, showing dynamic recrystallization occurring under all deformation conditions. Additionally, when the alloy was deformed sub-solvusly at higher temperatures and lower strain rates, the gamma' phase dissolved resulting in substantial grain growth.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
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
Chemistry, Physical
Qing Hu, Yan Wang, Liangxing Lv, Yaofeng Luo, Liang Su, Bin Liu
Summary: Hot processing is effective in optimizing the microstructure of gamma-TiAl alloy. This study investigates the hot deformation behavior and deformation mechanism of Ti-48Al-2Nb-2Cr alloy with near-gamma microstructure under different conditions. A constitutive model is established, and hot processing maps are constructed. The results demonstrate that dynamic recrystallization and dynamic recovery play significant roles in the softening mechanism of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Wenwen Zhang, Xingang Liu, Qiang Du, Haizhu Li, Heyong Qin, Qiang Tian
Summary: In this paper, a study was conducted on the microstructure evolution and deformation behavior of the GH4742 nickel-based superalloy during hot compression. Constitutive models were established for different microstructures, and the relationship between flow stress, hot processing map, and dynamic recrystallization mechanism was analyzed. The results show that the DRX mechanism is highly sensitive to the Z value.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Lei Jia, Heng Cui, Shufeng Yang, Shaomin Lv, Xingfei Xie, Jinglong Qu
Summary: This study investigated the causes of crack formation in the new cast GH4151 alloy ingots during the cogging process and established an optimized temperature and strain rate range through a series of hot compression tests to obtain a fine and uniform grain structure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Xiao-Min Chen, Meng -Tao Ning, Hong-Wei Hu, Yong-Cheng Lin, Xiao-Jie Zhou, Jian Zhang, Xian-Zheng Lu, Jian Chen, Yan-Xing Liu
Summary: The hot compressive behavior of GH4698 superalloy was studied in the temperature range of 950-1100 degrees C and strain rate range of 0.001-1 s-1. The results showed work hardening and dynamic recovery features at the beginning of deformation, followed by dynamic softening induced by dynamic recrystallization (DRX). An improved Zhu-Ou-Popov (ZOP) model was proposed to characterize the hot deformation behavior of the superalloy, which showed a high correlation coefficient of 0.9721. Processing maps were established based on the dynamic material model, and the microstructural evolution validated the feasibility of the maps. The maps revealed different regions with unstable, stable with low power dissipation, and stable with high power dissipation behavior, providing guidance for achieving desired performance in hot working.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Chunhe Chu, Qianying Guo, Yong Guan, Zhixia Qiao, Yongchang Liu
Summary: The CoNi-based gamma' phase strengthened superalloy was designed with the addition of alloy elements Al, W, Cr, Ti, and Ta. The size and volume fraction of the gamma' phase can be controlled by post-heat-treatment, which in turn affects the mechanical behavior of the alloy. At different temperatures, the deformation mechanism and correlated mechanical behavior of the alloy undergo significant changes.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(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
Materials Science, Multidisciplinary
Ding-ge Fan, Kun-kun Deng, Cui-ju Wang, Kai-bo Nie, Quan-xin Shi, Wei Liang
Summary: The addition of trace SiCp reduces the activation energy of the Mg-5Zn alloy, and the optimal deformation conditions were determined based on the processing map. The study also looked at the influence of PDZ size on the activation energy, as well as the effect of SiCp on the dynamic recrystallization behavior.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Yulong Zhu, Yu Cao, Qubo He, Jieke Zhang, Rui Luo, Hongshuang Di, Guangjie Huang, Qing Liu
Summary: This study investigated the hot deformation behavior of Alloy 925 through isothermal hot compression tests in different temperature and strain rate ranges. The stress distribution in three-dimensional space was reconstructed using an artificial neural network model. 3D distribution maps of strain rate sensitivity and power dissipation efficiency were proposed, and a novel 3D processing map was established. Microstructural characterization revealed differences between stable and unstable regions, and the optimal processing parameters were determined.
Article
Materials Science, Multidisciplinary
Jieke Zhang, Yu Cao, Yuhao Gong, Jun Xiao, Yulong Zhu, Rui Luo, Qubo He, Qing Liu
Summary: In this study, isothermal hot compression tests were conducted on Inconel X-750 alloy at elevated temperatures. The flow stress was accurately predicted using a back-propagation artificial neural network model. The optimal processing parameters were determined based on a modified hot processing map coupled with the variation of twin boundaries fraction. The possibility of grain boundary engineering via hot deformation was also evaluated. The high-temperature flow behavior and microstructure characterization showed the predominant softening mechanism and the contributions from different recrystallization mechanisms.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Tao Peng, Lu Wu, Hongyang Xin, Wei Zhang, Gang Yang
Summary: The high-temperature deformation behavior of Nimonic 105 alloy was studied, and a constitutive equation and processing map were established. The optimum hot working conditions for the alloy were determined based on the processing map and microstructure analysis.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Rui Ma, Lulu Li, Ruixue Zhai, Xiangnan Meng, Jun Zhao
Summary: During the forging process of GH901 superalloys, cracks and defects are easily produced, affecting the alloy's performance. High-temperature compression tests were conducted at different deformation temperatures and strain rates, leading to the establishment of flow stress constitutive models and processing maps for the alloy. The isothermal forging simulation validated the reliability of the thermal processing range.
Article
Materials Science, Multidisciplinary
Jian Ren, Liming Yu, Chenxi Liu, Zongqing Ma, Huijun Li, Zumin Wang, Yongchang Liu, Hui Wang
Summary: This study investigated the effects of Al addition on the oxidation mechanisms of 16Cr ODS steel. The results showed that 16Cr-3Al ODS steel, with Al addition, exhibited superior oxidation resistance compared to 16Cr ODS steel. Thermodynamic calculations were used to explore the oxidation mechanisms of both ODS steels, and it was found that the improved oxidation resistance of 16Cr-3Al ODS steel was attributed to the lower diffusion rate of O in Al2O3.
Article
Engineering, Mechanical
Ba Hieu Nguyen, Ali Al-Juboori, Hongtao Zhu, Azdiar A. Gazder, Huijun Li, Kiet Tieu
Summary: White etching layers (WELs) on rail surfaces significantly impact rail life by promoting crack growth and leading to fracture. Mechanically-induced WELs, with higher hardness and more severe cracks compared to thermomechanically-induced WELs, are more detrimental to rail life.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Automation & Control Systems
Chunyang Xia, Zengxi Pan, Yuxing Li, Ji Chen, Huijun Li
Summary: This study proposes applying deep learning in visual monitoring to diagnose various anomalies during the wire-arc additive manufacturing process. Different representative CNN architectures were investigated and compared for their classification performance. The results demonstrate the effectiveness of CNN models in classifying different types of melt pool images.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Industrial
Jingwen Zhang, Liming Yu, Yongchang Liu, Chenxi Liu, Zongqing Ma, Huijun Li, Zumin Wang, Dijun Long
Summary: The study successfully bonded tungsten with ODS steel using a novel composite interlayer Zr/Cu and transient liquid phase diffusion technology. By optimizing processing parameters, a high-strength joint was fabricated.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yong Guan, Yongchang Liu, Zongqing Ma, Huijun Li, Hongyao Yu
Summary: This study investigates the anomalous temperature dependence of strength and the effect of initial microstructure on the deformation mechanism of CoNi-based superalloys. The results show that the anomalous yield occurs above 600 degrees C, and the initial microstructure has a significant impact on the deformation mechanism. The relationship between the initial microstructure and the deformation mechanism is discussed, and the contribution of secondary gamma ' precipitates to the strength at the peak temperature is quantitatively assessed.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Jian Ren, Liming Yu, Chenxi Liu, Zongqing Ma, Huijun Li, Zumin Wang, Yongchang Liu, Hui Wang
Summary: The study systematically investigated the creep properties, microstructural evolution, and fracture mechanism of 16Cr-3Al ODS steel under different uniaxial tensile stresses at 600 degrees C. The relationship between the minimum creep rate and mean creep rate was linear, with a determined threshold stress. The evolution of the Cr-rich phase played a significant role in the fracture mechanism of 16Cr-3Al ODS steel after creep deformation.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Engineering, Manufacturing
G. K. Sujan, Huijun Li, Zengxi Pan, Daniel Liang, Nazmul Alam
Summary: The study found that post solution-annealed (SA) samples of IN718 superalloys fabricated using WAAM process maintained highly-textured solid-solution of gamma-matrix, but formed undissolved residual laves phases in Nb-enriched regions. High-temperature oxidation studies showed that oxidation mechanisms were temperature dependent, with the growth of oxide scale primarily dominated by the outward diffusion of Cr+3 cations.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Bintao Wu, Zhijun Qiu, Bosheng Dong, David Wexler, Zengxi Pan, Kristin Carpenter, Diego Raimundi Corradi, Huijun Li
Summary: In this study, the microstructure and mechanical properties of wire arc additively manufactured Ti6Al4V alloy with/ without magnetic arc oscillation were investigated. The results showed that the addition of magnetic arc oscillation resulted in refinement of the microstructure, modification of texture orientation, and improvement of mechanical properties of the deposition.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Mechanical
Abdul Haseeb Afridi, Hongtao Zhu, Eduardo Tovar Camacho, Guanyu Deng, Huijun Li
Summary: Rolling contact fatigue (RCF) crack is a dominant form of damage on rail surfaces caused by repeated contact with wheels. If left untreated, RCF defects such as squats and head checks can lead to rail fractures. Accurately predicting the damage under different operational conditions is crucial. A two-stage simulation strategy was proposed, investigating the mechanisms of RCF-induced cracks on rails through dynamic FEM for wheel-rail interaction and coupled static FEM/BEM for crack growth. The study found two critical wheel positions for crack propagation during wheel approach and departure from pre-existing cracks.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Mechanical
Ba Hieu Nguyen, Ali Al-Juboori, Hongtao Zhu, Qiang Zhu, Huijun Li, Kiet Tieu
Summary: This study systematically investigates the formation mechanism and evolution of white etching layers (WELs) on standard carbon (SC) rail and head hardened (HH) rail. The results show that repeated rolling contact influences the formation and distribution of WELs, and HH rail is more susceptible to WELs than SC rail.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
S. S. Chen, P. D. Song, J. Yin, K. Qi, H. D. Li, L. Hou, W. H. Li
Summary: This study reports on a plasma electrolytic oxidation (PEO)-treated Mg-Zn-Ca-Si amorphous alloy composite with enhanced plasticity and corrosion resistance. The coated material exhibits excellent mechanical properties in compression and a significant decrease in corrosion current density after treatment.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
J. M. Yu, T. Hashimoto, H. T. Li, N. Wanderka, Z. Zhang, C. Cai, X. L. Zhong, J. Qin, Q. P. Dong, H. Nagaumi, X. N. Wang
Summary: In this study, the microstructure of AA6082 alloy under different manufacturing processes was investigated using three-dimensional visualization. The results showed that the formation of supersaturated solute front at the α-Al solid-liquid interface is the key condition for the formation of Fe-bearing intermetallics and Mg2Si phase. Grain refinement processing leads to severe interconnectivity of Fe-bearing α-intermetallics, while intensive melt shearing process can more evenly distribute and refine the intermetallics, thereby improving the properties of the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Y. Sun, R. Jiang, L. F. He, Z. C. Li, R. D. K. Misra, H. P. Li
Summary: This study proposes a method of preparing 7075/Zr44Ti11Cu10Ni10Be25/7075 composites through stacked hot extrusion process, and systematically investigates the effects of extrusion conditions on the connected interfaces and thickness uniformity of the composites. The results show that the extrusion speed and temperature have significant effects on the crystallization and phase separation of the amorphous alloy. The most uniform and continuous interlayers can be obtained under optimal extrusion conditions, and the hardness of the interlayers is inversely related to the extrusion temperature and speed.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Manufacturing
Zhe Liu, Wei Guan, Huijun Li, Dongpo Wang, Lei Cui
Summary: This paper investigated the characteristics of traverse force (Fx), lateral force (Fy), and axial force (Fz) in bobbin tool friction stir welding (BTFSW) and their relationship with welding defects. The study found that the average value of Fy determined whether defects occurred in the weld. Analysis of material flow behavior revealed that an increase in Fy was due to severe material deposition on the retreating side (RS). Based on these findings, a decision tree model was built to predict welding defects, achieving an accuracy of 95.3%.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Chemistry, Physical
Yangfan Wang, Zhiyang Wang, Arman Hobhaydar, Zhijun Qiu, Bosheng Dong, Qinfen Gu, Zengxi Pan, David Wexler, Hanliang Zhu, Xizhang Chen, Mingxing Zhang, Huijun Li
Summary: Novel low activation medium entropy alloys (MEAs) of FeCr2V and FeCr2VW0.1 were developed as potential nuclear structural materials. The materials were fabricated using arc melting and their microstructure and mechanical properties were investigated. The results show that the developed MEAs exhibited a dual-phase microstructure consisting of body-centered-cubic (BCC) phases. The addition of W significantly enhanced the solid solution strengthening (SSS) and precipitation strengthening (PS) in the studied alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
