Article
Materials Science, Multidisciplinary
Osman Mamun, Madison Wenzlick, Arun Sathanur, Jeffrey Hawk, Ram Devanathan
Summary: In this study, a direct rupture life parameterization using a gradient boosting algorithm was shown to effectively train machine learning models for highly accurate prediction of rupture life in various alloys. The Shapley value was utilized to quantify feature importance, making the model interpretable by identifying the impact of different features on performance. Additionally, a generative model based on a variational autoencoder was used to sample hypothetical synthetic candidate alloys from the learned joint distribution.
NPJ MATERIALS DEGRADATION
(2021)
Article
Materials Science, Multidisciplinary
K. Kimura, K. Sawada
Summary: The creep rupture ductility of both creep strength-enhanced ferritic steels and conventional 2.25Cr-1Mo steels was investigated. A trade-off relation between creep rupture strength and creep rupture ductility was found for Grade T/P23 steels, as well as for conventional 2.25Cr-1Mo steels. The decrease in creep rupture ductility and strength was attributed to microstructural changes caused by inhomogeneous recovery of tempered martensitic microstructure. A modified heat treatment process with intermediate tempering was found to improve the creep rupture ductility of Grade P92 steel by reducing residual stress.
MATERIALS AT HIGH TEMPERATURES
(2022)
Article
Chemistry, Physical
Hang Wang, Keer Li, Wei Chen, Lihong Han, Yaorong Feng
Summary: In this study, the addition of chromium element in plain carbon steel was found to effectively improve the creep resistance and remnant strength of oil casing under high temperature and high pressure conditions during in situ combustion for heavy oil recovery. The addition of 1 wt.% chromium element reduced the creep rate and maintained high remnant tensile strength, while the addition of 13 wt.% chromium element significantly enhanced the remnant strength after long-term creep. The improved mechanical performance of the chromium-doped steels is attributed to the precipitation retardation of carbides and sluggish precipitate coarsening. These findings contribute to the development of high-performance steels for unconventional petroleum and gas resources.
Article
Nanoscience & Nanotechnology
Yongjie Zhang, Goro Miyamoto, Tadashi Furuhara
Summary: The interphase precipitation behaviors and hardening effects in V-microalloyed low carbon steels with Nb or Ti addition were investigated. It was found that the multiple-added alloys exhibit advantages in terms of alloy carbide density, size, and ferrite hardness.
SCRIPTA MATERIALIA
(2022)
Article
Engineering, Mechanical
Deepshree D. Awale, V. D. Vijayanand, Atul R. Ballal, Manjusha M. Thawre, J. Ganesh Kumar, G. V. Prasad Reddy
Summary: Strength variations in a dissimilar weld joint made between 316LN stainless steel (SS) and P91 steel after creep exposure at 550 degrees C and stress of 200 MPa were estimated using automated ball indentation (ABI) test. Results showed that the creep exposure strengthened the 316LN SS side but caused a loss of strength in the P91 steel side. The ABI-derived results indicated that the intercritical-heat affected zone (IC-HAZ) of P91 steel was the weakest region across the weld after creep exposure.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Chemistry, Physical
Bernd Kuhn, Michal Talik
Summary: HiperFer steels are a new type of heat-resistant, fully ferritic materials with increased mechanical strength and improved resistance to steam oxidation. Heat treatment was found to significantly improve the creep performance of the material, leading to a 100% increase in rupture time at 650 degrees C and a creep stress of 100 MPa.
Article
Materials Science, Multidisciplinary
Nicolas Di Luozzo, Sandra Cabeza, Michel Boudard, Marcelo Fontana
Summary: Transient liquid phase bonding (TLPB) welding method delivers heat simultaneously to the entire joint, resulting in lower cooling rates and lower residual stress peak magnitudes. Numerical simulation through thermal and mechanical analysis can predict residual stresses in TLPB weldments.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Xiaogang Li, Junfeng Nie, Xin Wang, Kejian Li, Zhipeng Cai, Haiquan Zhang
Summary: This study investigates the behaviour and mechanism of interfacial microstructure evolution during long term high temperature exposure and the effect of interface structure on creep failure in dissimilar metal welds. The results show that the welding of nickel-based and ferritic materials leads to the formation of an interfacial martensite layer in the ferritic steel side of the weld. During long term high temperature exposure, the interfacial martensite transforms to ferrite due to carbon diffusion and migration near the interface between the martensite layer and the weld metal. Under creep conditions, the failure of the welds is prone to occur along the interface between the weld metal and the ferritic steel, which is related to strain concentration around the interfacial ferrite formed during service.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Shichun Liu, Haokai Dong, Yubo Li, Zhigang Yang, Hao Chen
Summary: This study explores the potential effects of flash annealing on the microstructure and mechanical properties of cold-rolled NANOHITEN ferritic steel. The process results in an ultrafine-grained heterostructured matrix, composed of recrystallized/transformed and non-recrystallized/transformed domains, leading to a high strength level of 1 GPa without significant loss in ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
Junya Sakurai, Masahiko Demura, Junya Inoue, Masayoshi Yamazaki
Summary: In this study, machine learning methods were used to predict creep rupture time for various ferritic heat resistant steels. The prediction models, constructed using support vector regression, random forest, and gradient tree boosting, exhibited high predictivity. The absence of microstructure information did not affect the predictivity, indicating a correlation between chemical composition and microstructure for commercial steels.
TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN
(2022)
Article
Nanoscience & Nanotechnology
Hao Yu, Shoukui Yang, Jianfeng Shao, David San-Martin, Wei Xu
Summary: For ferritic self-healing (FSH) steel, the low healing efficiency problem has been addressed by proposing an offline healing treatment that stimulates the formation of Laves phase precipitates as self-healing agents. The treatment extended the creep lifetime by more than 30% and reduced the creep rates by one order of magnitude. The relationship between the extended lifetime and filling ratios of creep cavities by the healing agents was established, providing a new strategy for cultivating the self-healing capabilities of heat resistant steels.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Multidisciplinary
Jun Cao, Ke Wang, Weifeng Ma, Junjie Ren, Hailiang Nie, Wei Dang, Xiaobin Liang, Tian Yao, Xiaohan Zhao
Summary: Creep failure of in-service pipes is an important engineering issue, and the girth weld joint is a weak link. This study investigates the local creep properties and mechanisms of the X70 girth weld through experiments and microstructure analysis.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Article
Engineering, Mechanical
Nathan Bieberdorf, Aaron Tallman, M. Arul Kumar, Vincent Taupin, Ricardo A. Lebensohn, Laurent Capolungo
Summary: In this study, a physics-based crystal plasticity model was developed to predict failure in Grade 91 steel. A material response database and a new reduced-order lifetime predictor were generated, and the proposed lifetime assessment tool predicted rupture times several orders more conservative compared to current empirically derived lifetime relations.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Materials Science, Characterization & Testing
Bhaawan Gupta, Benjamin Ducharne, Tetsuya Uchimoto, Gael Sebald, Takamichi Miyazaki, Toshiyuki Takagi
Summary: This study compared three different electromagnetic NDT techniques applied to high-chromium steels to understand the microstructural changes associated with creep evolution. Modeling techniques were proposed for each applied method, with model parameters optimized for each NDT technique and tested material. The accuracy of parameter determination strongly depends on the NDT technique, indicating its correlation with microstructural information.
NDT & E INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Christoph Kickinger, Clemens Suppan, Thomas Hebesberger, Ronald Schnitzer, Christina Hofer
Summary: A new heat treatment method for partially ferritic Q&P steel was investigated, introducing ferrite through slow gas jet cooling after full austenitization. Results showed that both partially ferritic heat treatments significantly increased elongation, with IC treatment resulting in a better combination of local and global formability.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Multidisciplinary
Abraham Mensah, Srinivas Sriramula
Summary: This paper proposes a pathway for developing efficient performance functions to evaluate the probability of failure for interacting pipeline corrosion clustering defects using a probabilistic finite element-based reliability method. The framework reduces computational cost and offers informed decision-making on risk and maintenance management.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2024)
Article
Engineering, Multidisciplinary
Baozhu Zhang, Wenchun Jiang, Yun Luo, Wei Peng, Yingjie Qiao
Summary: This paper studies the distribution of residual stress in thick wall girth welds using narrow-gap welding. The study finds that the heat input, wall thickness, radius thickness ratio, and number of welding passes have an effect on residual stress. A model for the distribution of welding residual stress through the wall thickness is proposed, and its results are in good agreement with finite element calculation results.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2024)
Article
Engineering, Multidisciplinary
Stefan Culafic, Darko Bajic, Tasko Maneski
Summary: This paper presents experimental research on a branch model conducted in laboratory conditions. The study verifies the linear relationship between stress and internal pressure in the field of elasticity and reveals the occurrences when stresses exceed the yield strength of the branch material, such as plastic deformations of the branch model. The research also defines the dependence of stress on internal pressure in both the field of elasticity and the zone of residual stresses.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2024)
Article
Engineering, Multidisciplinary
Wenchun Jiang, Wenlu Xie, Xinyue Qi, Yangguang Deng, Yu Wan, Xuefang Xie
Summary: Various types of solid-state phase transformations (SSPT) occur during the SA508 steel welding process, leading to complex microstructure distribution and significant influence on residual stress distribution. To better control microstructure and residual stress, optimization of process parameters related to welding thermal cycles is necessary.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2024)
