Article
Materials Science, Multidisciplinary
Wei Liu, Hua Zhang, Zhiling Liu, Jingjing Ruan, Hailiang Huang, Xin Zhou, Lilong Zhu, Shangzhou Zhang, Liang Jiang
Summary: This study investigates the hot-working characteristics, microstructure evolution, and dynamic recrystallization of the hot isostatically pressed (HIPed) FGH4096 superalloy at various temperatures and strain rates. A new constitutive equation is developed to accurately predict flow stresses under different deformation conditions. Hot working maps are established to optimize the hot working parameters. Different recrystallization behaviors are observed in different regions, with deformation temperature having a greater influence than strain rate on dynamic recrystallization. Adiabatic shear bands, voids, and cracks along grain boundaries contribute to flow instability in the instability regions. An optimized hot working window is determined based on the hot working map and microstructure evolution.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Yaohui Song, Yugui Li, Huaying Li, Guanghui Zhao, Zhihui Cai, Mingxu Sun
Summary: The hot deformation behavior of nickel-base superalloy was investigated and models for strain compensation Arrhenius and recrystallization fraction were established. The results showed that the recrystallization fraction increased with the increase of deformation temperature, while it first decreased and then increased with the increase of strain rate.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Zonghong Qu, Pingxiang Zhang, Shujin Liang, Yunjin Lai, Jun Wang, Jiangkun Fan, Ruimin Bai
Summary: Flow behavior and dynamic recrystallization of hot isostatically pressed superalloy EP741NP were investigated. Isothermal compression tests were conducted at a moderate strain rate and sub-solvus temperatures, and the deformed samples were analyzed using various microscopy techniques. The results showed that the hot isostatically pressed EP741NP alloy exhibited abnormal flow behavior with four work hardening stages when deformed below 1140 degrees C. This abnormal flow behavior was attributed to the preferential local strain around the previous particle boundary, which interacted with dislocations, stimulating local recrystallization and causing abnormal yielding during work hardening. Subsequently, the dissolved secondary gamma' phases re-precipitated on new gamma grain boundaries, forming a special gamma + gamma' structure that restricted the growth of new gamma grains.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(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
Zonghong Qu, Pingxiang Zhang, Shujin Liang, Yunjin Lai, Jun Wang, Jiaming Song
Summary: The hot deformation behavior of powder metallurgy superalloy EP741NP was studied, and constitutive equations and processing maps were constructed based on experimental stress-strain data. The dissolved gamma ' had a more significant effect on the processing map than strain rate and strain, and the optimal processing conditions were determined to be at temperatures of 1150-1170 degrees C and strain rates of 0.005-0.02 s(-1).
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Physical
Yiqi Chen, Hong Li, Song Zhang, Jiao Luo, Junfei Teng, Yanlong Lv, Miaoquan Li
Summary: In this study, the hot tensile deformation behavior of the GH3230 superalloy double-sheet was investigated through experiments conducted at various deformation temperatures and strain rates. The results showed that the deformation process of the GH3230 superalloy double-sheet consisted of four stages: elastic deformation, strain hardening, steady state, and fracture. The true stress decreased with increasing deformation temperature and decreasing strain rate. The average apparent activation energy for hot tensile deformation was determined to be 408.53 +/- 46.96 kJ.mol(-1). A combined Johnson-Cook and Hensel-Spittle model considering the coupling effect of strain hardening, strain rate hardening, and thermal softening was established, which exhibited the highest predicting accuracy compared to other models. The average absolute relative error between the experimental and predicted true stresses was only 2.35%.
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
Qiu-Mei Yang, Yong-Cheng Lin, Guan Liu, Ming-Song Chen, Yu-Liang Qiu
Summary: The rheological behavior and deformation mechanisms of a new powder metallurgy (P/M) superalloy were investigated under different deformation conditions. It was found that the rheological stress can be reduced by increasing the deformation temperature or decreasing the strain rate. The deformation mechanisms of the superalloy include dislocation accumulation, stacking faults shearing, dislocations pinned by gamma ' phase, and the formation of microtwins during hot deformation. A particle swarm optimization-based backpropagation artificial neural network (PSO-BP ANN) model was developed to accurately predict the rheological behavior of the alloy.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Yiwa Luo, Chengbin Shi, Haochi Xu
Summary: In this study, the hot deformation behavior and microstructure evolution of a newly designed iron-based superalloy with 15Cr-22Ni and 0.6 wt %Nb were investigated. Accurate constitutive equations were established to predict the high-temperature flow behavior, and a kinetic model for dynamic recrystallization was developed. The precipitation of nano-sized NbC particles at grain boundaries and dislocations was induced during hot deformation. The dynamic recrystallization behavior of the designed superalloy was compared with that of the 15Cr-22Ni-1 Nb alloy, showing a delayed start and faster kinetics in the designed superalloy due to the weak pinning force of nano-sized NbC precipitates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Zonghong Qu, Pingxiang Zhang, Yunjin Lai, Qingxiang Wang, Jiaming Song, Shujin Liang
Summary: The influence of powder particle size on the microstructure of the powder metallurgy superalloy FGH97 was investigated. The results showed that fine powder led to limited plastic deformation, resulting in fewer boundaries and modest particle boundary decoration. On the other hand, medium-sized and coarse powder did not exhibit particle boundary. Therefore, medium-sized powder is the optimal choice.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(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
Yanjiang Wang, Zhi Jia, Jinjin Ji, Sidan Li, Dexue Liu
Summary: This study comprehensively investigated the nucleation mechanism of deformation twin (DT) and annealing twin (AT), and their effects on recrystallization in Nickel-based superalloys during dynamic recrystallization (DRX). The results showed that DTs were nucleated by the rotation and decomposition of dislocations, hindering the movement of dislocations in deformed grains and promoting the nucleation of DRX grains. ATs formed at recrystallized grain boundaries and had different effects on continuous and discontinuous DRX. The comprehensive effect of DTs and ATs promoted DRX nucleation, with varying effects depending on the nucleation mechanism.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Yongdi Wang, Pengfei Gao, Hongwei Li, Mei Zhan, Shuai Wang
Summary: The deformation characteristics of GH3128 alloy were investigated and a modified JC-ZA constitutive model was proposed to predict the stress-strain curves. A hot processing map for the alloy was also developed. These findings provide valuable theoretical references for the processing design of GH3128 alloy components.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Nanoscience & Nanotechnology
Hongkai Zhang, Yan Li, Hechuan Ma, Peng Zhang, Tengfei Ma, Ke Huang
Summary: A new manufacturing method that only involves pre-annealing and hot deformation steps is proposed in this study, which successfully modulates diverse nanoscale precipitation strengthening phases with similar grain sizes. The modulated alloys exhibit high strength without the need for lengthy post-processing treatments.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jie Xiong, Jian-Chao He, Xue-Song Leng, Tong-Yi Zhang
Summary: The hot deformation behaviors of FGH98 nickel-based powder superalloy were investigated experimentally and theoretically. Hot compression tests were performed on the FGH98 superalloy at various temperature and strain rate conditions. The peak stresses under different deformation conditions were analyzed using the Sellars model and a Gaussian process regression (GPR) model based on machine learning. The GPR model showed better prediction performance than the Sellars model. Additionally, the stress-strain responses were predicted and validated using the GPR model and experimental data. The developed GPR model demonstrated high predictive capability for the hot deformation behaviors of FGH98 superalloy, with an R2 value above 0.99 on the test dataset.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
A. Patel, I. Wani, S. R. Reddy, S. Narayanaswamy, A. Lozinko, R. Saha, S. Guo, P. P. Bhattacharjee
Article
Materials Science, Multidisciplinary
R. R. Eleti, V. Raju, M. Veerasham, S. R. Reddy, P. P. Bhattacharjee
MATERIALS CHARACTERIZATION
(2018)
Article
Materials Science, Multidisciplinary
Tilak Bhattacharjee, Ruixiao Zheng, Yan Chong, Saad Sheikh, Sheng Guo, Ian Thomas Clark, Toshiro Okawa, Irfan Samad Wani, Pinaki Prasad Bhattacharjee, Akinobu Shibata, Nobuhiro Tsuji
MATERIALS CHEMISTRY AND PHYSICS
(2018)
Article
Materials Science, Multidisciplinary
Seelam Rajasekhar Reddy, Upender Sunkari, Adrianna Lozinko, Sheng Guo, Pinaki Prasad Bhattacharjee
JOURNAL OF MATERIALS RESEARCH
(2019)
Article
Materials Science, Multidisciplinary
S. Narayanswamy, S. R. Reddy, R. Saha, P. P. Bhattacharjee
MATERIALS SCIENCE AND TECHNOLOGY
(2019)
Article
Chemistry, Physical
Vajinder Singh, Chandan Mondal, Atul Kumar, P. P. Bhattacharjee, P. Ghosal
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Chemistry, Physical
Mohd Ishtiyak, Subhendu Jana, S. Narayanswamy, Abhishek K. Nishad, Gopabandhu Panigrahi, Pinaki P. Bhattacharjee, Jai Prakash
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Materials Science, Multidisciplinary
U. Sunkari, S. R. Reddy, S. Chatterjee, P. P. Bhattacharjee
Article
Nanoscience & Nanotechnology
S. R. Reddy, S. Yoshida, U. Sunkari, A. Lozinko, J. Joseph, R. Saha, D. Fabijanic, S. Guo, P. P. Bhattacharjee, N. Tsuji
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Chemistry, Physical
S. R. Reddy, U. Sunkari, A. Lozinko, R. Saha, S. Guo, P. P. Bhattacharjee
Article
Multidisciplinary Sciences
S. R. Reddy, S. Yoshida, T. Bhattacharjee, N. Sake, A. Lozinko, S. Guo, P. P. Bhattacharjee, N. Tsuji
SCIENTIFIC REPORTS
(2019)
Article
Chemistry, Physical
Vajinder Singh, Chandan Mondal, Rajdeep Sarkar, P. P. Bhattacharjee, P. Ghosal
Summary: The evolution of as-solidified microstructures and phase stability during high-temperature exposure of Ti-45Al base alloys with alloying elements Nb, Cr, and B were analyzed. It was found that Nb, Cr, and B can be effective grain size refiners, but strong Cr partitioning significantly slows down the kinetics of beta-phase decomposition.
Article
Chemistry, Physical
B. Tripathy, R. Saha, P. P. Bhattacharjee
Summary: This study investigated the microstructure and recrystallization texture of a severely deformed and annealed high entropy alloy. The cold rolling process resulted in bending and folding of the lamellae and alignment of the phases, while the annealing process formed an ultrafine structure. The FCC phase showed a predominantly brass-type texture due to its low stacking fault energy. The prior cold rolling influenced the annealing behavior, leading to the formation of a strong brass recrystallization component. The presence of BCC/B2 phase inhibited grain growth and preserved the recrystallized B grains.
Article
Materials Science, Multidisciplinary
N. K. Chaitanya, B. Yadav, P. P. Bhattacharjee, M. Vaidya
Summary: Solid-state diffusion in materials is affected by microstructural features such as grain boundaries, dislocations, and second phase particles, but the relationship between structure and kinetics during interdiffusion is not well understood. In this study, a novel sandwich diffusion couple approach was used to investigate the effects of microstructure on phase formation in the Ni-Sn system. Different microstructures were obtained by cold rolling and spark plasma sintering, and intermetallic phase growth at each interface was analyzed after annealing. The results showed that the presence of ultrafine-grained microstructure dominated by high-angle boundaries enhanced the kinetics of interdiffusion.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Bolla Reddy Bodapati, P. Sudharshan Phani, P. P. Bhattacharjee, G. Sundararajan
MATERIALS TODAY COMMUNICATIONS
(2018)
