Article
Materials Science, Multidisciplinary
Jianbing Gao, Zhenlin Xu, Xudong Fang, Junjing He, Weihuo Li, Xiaojie Du, Yizhu He, Xiquan Jia, Shengxuan Zhou
Summary: In this study, the effect of aging on the creep resistance of a Fe-Cr-Ni medium-entropy alloy (MEA) was investigated. The precipitate evolution in the aged MEA was analyzed, and it was found that the nano-sized Cu-rich and NbC precipitates significantly improved the creep resistance after long-term aging.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Metallurgy & Metallurgical Engineering
Ying Han, Jiaqi Sun, Jiapeng Sun, Guoqing Zu, Weiwei Zhu, Xu Ran
Summary: By studying the creep behavior of the Fe-17Cr-1.2Cu-0.5Nb-0.01C ferritic heat-resistant stainless steel, it was found that as the temperature increased and the stress decreased, the softening of the metal matrix accelerated, leading to more prominent plastic flow. The creep process generated Cu-rich phases and Nb-rich Laves particles in co-existence, with characteristics of ductile fracture.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Tian-Ye Niu, Peng Zhao, Gang Zhu, Jian-Guo Gong, Fu-Zhen Xuan
Summary: This study elucidates the effects of different stress states on creep damage mechanisms in 9-12%Cr steels under long-term high temperature exposure. Equivalent stress and stress tri-axiality have different impacts on the creep damage behavior of notched components, with the variation of stress states being evidenced by hardness distribution.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Wan Zhu, Zeyue Zhang, Dijun Long, Huijun Li, Liming Yu
Summary: In this study, the creep deformation behavior, microstructure evolution, and damage mechanism of Super304H oxide dispersion strengthened (ODS) steel at 650°C were systematically investigated. The creep behavior of the ODS steel was explained by a dislocation creep deformation mechanism. Interrupted creep experiments were conducted at 100 MPa to study the microstructure evolution during long-term creep deformation. The development of cavities around M23C6 phases and grain boundaries led to significant cracks and fracture of the steel during the second creep stage.
Article
Metallurgy & Metallurgical Engineering
Li Xiaolin, Liu Linxi, Li Yating, Yang Jiawei, Deng Xiangtao, Wang Haifeng
Summary: In recent decades, there has been a push to increase the operating temperature of steam generators to the ultra-supercritical regime. However, creep-resistant alloys face the challenge of coarsening of M23C6 and Laves phases during long-term service. Therefore, restricting the formation of easily coarsened precipitates is significant.
ACTA METALLURGICA SINICA
(2022)
Article
Materials Science, Multidisciplinary
Qingdong Liu, Hui Song, Jing Zhang, Jiaxin Ding, Yihua Chen, Jianfeng Gu
Summary: The novel ultralow carbon precipitation-hardening Ni-Mn-Cu-Al-Co ferritic steel was designed to investigate the co-precipitation behaviors of Cu-rich and beta-NiAl precipitates. Nanoscale clusters and precipitates formed at 450 and 500 degrees C tempering are responsible for the strong precipitation strengthening effect. The strength contributions from dislocated martensite, solid solution, and precipitation were compared with experimental values, with precipitation hardening found to be dominant.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Lihua Zhan, Wenfang Yu, Yongqian Xu, Chunhui Liu, Bolin Ma, Kai Chen, Beizhen Su, Shugen Luo, Keyuan Xia, Xiaobo Yang
Summary: The creep deformation, age hardening response, and microstructural evolution of an Al-Cu-Mg-Si alloy under different stress levels have been investigated. The results show that the alloy exhibits different creep behaviors and aging precipitation sequences depending on the stress loading and initial dislocation density.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Multidisciplinary
Sai-Sai Guo, Jian-Guo Gong, Peng Zhao, Tian -Ye Niu, Fu-Zhen Xuan
Summary: This study investigates the time-dependent microstructural evolution and its dependence on stress state in 9-12% Cr steel notched components through creep tests with different root radii. The results show that during the transient stage, there is a significant redistribution of stress state, which affects the nucleation or growth of cavity. Precipitate coarsening is heterogeneous and promoted by high equivalent stress or stress triaxiality. In the steady stage, the magnitude of stress state influences the creep damage behavior, with higher cavity density and greater reduction in hardness observed in regions with high equivalent stress and stress triaxiality.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Materials Science, Multidisciplinary
Thi Giang Le, Kee Bong Yoon, Young Wha Ma
Summary: The translation discusses the importance of predicting metal temperatures and evaluating microstructure changes in service-life assessments for boiler tubes in thermal power plants. The study used as-received and service-exposed tubes to analyze metal temperature and microstructure characteristics, finding significant changes in precipitation behavior and creep damage after long-term service. The results showed stable Nb(C,N) precipitates, increasing string M23C6 precipitates and Cu-rich phase particles, and the development of creep damage characterized by creep cavities linking and growing into microcracks in the tube exposed for 68,550 hours.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Wen Fu, Chengning Li, Xinjie Di, Kuijun Fu, Heshan Gao, Chao Fang, Siyao Lou, Dongpo Wang
Summary: The effect of Mo element on the precipitation behavior of nanoscale Cu-rich particles in Cu-bearing low carbon high strength steels was investigated. It was found that the addition of Mo refined the size of grain interior Cu-rich particles and inhibited the formation of grain boundary Cu-rich particles. The enrichment of Mo in the matrix suppressed the diffusion of Cu atoms and merger of Cu-rich particles. The CuMo-bearing steel showed increased yield strength and suppressed crack initiation and propagation at grain boundaries, leading to an increment in absorbed energy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xiaopeng Xiao, Dianzhong Li, Yiyi Li, Shanping Lu
Summary: The formation of stress relaxation cracks under different tensile residual stresses and aging time in Super304H austenitic stainless steel weld metal was quantitatively investigated using the pre-compressed CT technique. The statistical results showed that intergranular cracks could occur within a certain period of time, and different carbides were the main causes of crack formation. Furthermore, the mechanism responsible for crack formation varied under different aging time conditions.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Letter
Engineering, Mechanical
Xiao Wang, Yuetao Zhang, Qing Chang, Mingyu Huang
Summary: This study assessed the degradation of Super304H during creep using misorientation-derived parameters, showing significant changes in these parameters with increasing creep time. The parameters exhibited a non-monotonic trend, initially decreasing slightly before increasing later. The increase in GROD and GOS was larger than KAM and GND density, indicating they are more suitable for assessing the creep degradation of Super304H.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
Andrew Peterson, Ian Baker
Summary: The microstructural evolution of an alumina-forming austenitic stainless-steel Fe-20Cr-30Ni-2Nb-5Al (at. %) was investigated after creep at 760 degrees C. It was found that the secondary creep rate was correlated with changes in the microstructure, with precipitation playing a key role and grain boundary strengthening gradually emerging.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Florian Riedlsperger, Bernadette Gsellmann, Erwin Povoden-Karadeniz, Oriana Tassa, Susanna Matera, Maria Domankova, Florian Kauffmann, Ernst Kozeschnik, Bernhard Sonderegger
Summary: A thermokinetic computational framework was developed for precipitate transformation simulations in Ta-containing martensitic Z-steels, showing excellent agreement with experimental data in terms of size, number density and chemical composition of the precipitates. The framework considered a wide range of input parameters and focused on modelling the transformation of MX into the Z-phase, driven by Cr diffusion.
Article
Nanoscience & Nanotechnology
Huansheng He, Jingwen Zhang, Liming Yu, Qiuzhi Gao, Chenxi Liu, Zongqing Ma, Huijun Li, Yongchang Liu, Hui Wang
Summary: This study systematically investigated the microstructure evolution and creep deformation behavior of G115 steels with Cu-rich phases at elevated temperatures. The results showed that the Cu-rich phases played a vital role in retarding microstructural degeneration and improving creep strength, which is of great significance for the application and improvement of steel materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xingfei Xie, Dong Ning, Bin Chen, Shusheng Lu, Jian Sun
Article
Materials Science, Multidisciplinary
Xingfei Xie, Dong Ning, Jian Sun
MATERIALS CHARACTERIZATION
(2016)
Article
Materials Science, Multidisciplinary
Xingfei Xie, Dong Ning, Jian Sun
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2018)
Article
Metallurgy & Metallurgical Engineering
Xie Xingfei, Zhang Jinlong, Zhu Li, Yao Meiyi, Zhou Bangxin, Peng Jianchao
ACTA METALLURGICA SINICA
(2012)
Article
Materials Science, Multidisciplinary
Xingfei Xie, Jinlong Zhang, Meiyi Yao, Bangxin Zhou, Jianchao Peng, Xue Liang
JOURNAL OF NUCLEAR MATERIALS
(2014)
Article
Metallurgy & Metallurgical Engineering
Jinlong Zhang, Xingfei Xie, Meiyi Yao, Bangxin Zhou, Jianchao Peng
OXIDATION OF METALS
(2014)
Article
Chemistry, Physical
Jinglong Qu, Xingfei Xie, Zhongnan Bi, Jinhui Du, Maicang Zhang
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Proceedings Paper
Energy & Fuels
Xingfei Xie, Jian Sun
ENERGY MATERIALS 2017
(2017)