Article
Materials Science, Multidisciplinary
T. Sakthivel, C. R. Das, K. Laha, G. Sasikala
Summary: The boron containing modified 9Cr-1Mo steel (P91B-IC) exhibited higher creep rupture strength and lower minimum creep rate compared to the boron free modified 9Cr-1Mo steel (P91-IC) after intercritically heat-treated at 923K.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Chemistry, Physical
R. Rejeesh, Ankita Bhattacharya, Chandan Haldar, Rahul Mitra, Debalay Chakrabarti, C. R. Das, Shaju K. Albert, Arun Kumar Bhaduri
Summary: The systematic study on modified 9Cr-1Mo steel revealed the combined effect of B and N addition on microstructural stability and creep resistance. The best creep resistance was observed in the steel with 70 ppm B and 108 ppm N, while either too low B content or too high N content affected the precipitate stability and creep resistance of the steel.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Zhongyi Chen, Dongxu Kou, Zhengzong Chen, Yongqing Li, Yonglin Ma, Yiming Li
Summary: In this study, welding thermal simulation was conducted to investigate the effect of boron content and cooling time on the continuous cooling transformation behavior of the welded coarse-grained heat-affected zone of G115 new martensitic heat-resistant steel. The presence of boron increased the values of A(c1) and A(c3) and decreased Ms and Mf. The segregation of boron atoms at the prior-austenite grain boundaries and the formation of high melting point carbides inhibited the nucleation and growth of austenite, resulting in delayed austenitizing process and increased A(c1) and A(c3). The adsorption of boron atoms on the undercooled austenite grain boundaries improved their stability, thereby promoting the decrease in Ms and Mf. The decrease in alloy content in undercooled austenite caused by the formation of alloy cementite was the main reason for the gradual increase in Ms and Mf in materials containing boron with larger cooling time (t(8/5)).
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Ping Fan, Xinbao Liu, Jinye Peng, Lin Zhu, Kai Zhang
Summary: This study investigated the creep damage of 9Cr-1Mo steel using nonlinear Lamb waves, and found that the measured acoustic nonlinearity parameter is strongly dependent on the creep state. The hierarchical microstructure of 9Cr-1Mo steel evolves during creep. By applying analytical models and kinetics of microstructure evolution, the predominant component of acoustic nonlinearity during the creep process was successfully identified.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
K. Mariappan, A. Nagesha
Summary: The paper presents a study on the creep-fatigue interaction behavior of simulated heat-affected zones (HAZs) of P91 steel weldment with different microstructures. Strain-controlled fatigue tests were conducted at 550 C, showing continuous cyclic softening under the creep-fatigue condition. Strain localization and interlinkage of subsurface creep cavities caused enhanced crack propagation, resulting in the lowest fatigue life in the inter-critical HAZ. The actual weldment failed in the interface between fine grain HAZ and inter-critical HAZ, largely governed by Type IV cracking.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Yatindra Kumar, Manmath Kumar Dash, A. Moitra, G. Sasikala, Shaju K. Albert
Summary: This study quantifies the improvement in creep crack growth resistance in the heat-affected zone of boron-added modified 9Cr-1Mo steel welds at high temperatures. It demonstrates that the addition of boron can significantly reduce crack growth rates, decrease creep damage, and enhance resistance to creep crack growth.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Lizhen Tan, Weicheng Zhong, Ying Yang, Kevin G. Field, Niyanth Sridharan, Andrew T. Nelson
Summary: Limited studies have evaluated the creep behavior of additively manufactured ferritic-martensitic steels. This study investigated the creep behavior of a 9Cr FM steel fabricated by powder blown directed energy deposition technique. The results showed a threshold temperature between 600 and 625 degrees C, below which the steel exhibited better creep resistance compared to other steels. The creep behavior and fracture surface morphology also differed at temperatures above and below the threshold.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
R. Rejeesh, Sankalp Biswal, Rahul Mitra, Debalay Chakrabarti, C. R. Das, Shaju K. Albert
Summary: Five different steels with varying boron (0-100 ppm) and nitrogen (20-500 ppm) concentrations were subjected to two types of weld thermal cycles, and the effects of boron and nitrogen on the heat affected zone creep resistance of modified 9Cr-1Mo steel were studied. High boron steels showed better creep resistance compared to low boron steels, and the effect of boron was found to be more significant than that of nitrogen. Additionally, the difference in rupture lives between simulated inter-critical HAZ and simulated coarse-grained HAZ specimens revealed the influence of triaxiality on rupture lives.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Chemical
Pradyumna Kumar Parida, Arup Dasgupta, Shubhra Bajpai, T. Sakthivel, R. Mythili
Summary: Oxide dispersion strengthened (ODS) steels, containing Ti and Y2O3, show superior mechanical properties and creep-rupture life compared to modified 9Cr-1Mo (P91) steel. Optimizing the Y2O3 and Ti content in ODS steels governs the size and stoichiometry of the dispersoids, with equal amounts of Ti and Y2O3 resulting in finer and stable dispersoids. Two varieties of ODS alloys with different Ti and Y2O3 contents were synthesized and compared with P91 steel in terms of microstructure and microtexture.
Article
Materials Science, Multidisciplinary
Kaiyu Cui, Haifeng Yang, Shengjie Yao, Zhengrong Li, Guodong Wang, Hongyun Zhao, Xinchen Nan
Summary: Shielded metal arc welding and welding thermal simulation experiments were conducted on constructional steel with different amounts of V. The study investigated the microstructure, precipitation feature, microhardness, and impact value in different heat affected zones. The results showed that the presence of V and N significantly affected the microstructure and properties of the steel.
Article
Materials Science, Multidisciplinary
Oleksii Sherepenko, Alireza Mohamadizadeh, Anastasiia Zvorykina, Michael Worswick, Elliot Biro, Sven Juttner
Summary: This study investigates the use of coated press-hardened steels in BiW components, highlighting challenges in welding and proposing solutions. Through experiments and numerical simulations, the mechanical performance and failure modes of spot welds were accurately predicted.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
T. Sreepriya, R. Mythili, G. V. Prasad Reddy
Summary: This study investigates the phase-specific nanomechanical properties of heat treated 9Cr 1Mo steel using the instrumented indentation technique (IIT). By correlating the local mechanical response measured by IIT with microstructural changes, the mechanical properties of materials with heterogeneous microstructures can be extracted.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Zhiqiang Wu, Shuai Liu, Zhibin Yang, Honggang Zhou, Eric Li, Haijun Pan, Yini Chen, Liwei Lu, Longfei Liu
Summary: A pathway for post-weld heat treatment (PWHT) to eliminate heat affected zone (HAZ) softening and improve the strength of welded joints of DP980 steel has been developed. By conducting high temperature isothermal transition followed by water-quenching, the microstructures of the welded joints are changed, leading to significant improvement in strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Pengyu Wen, Zhengzong Chen, Lixia Yang, Zedong Xie, Danqi Huang, Zhengdong Liu, Haiwen Luo
Summary: This study investigated the ripening kinetics of M23C6 carbide in P92, 9Cr, and 9Cr1W steels. It was found that the diffusivity of Cr and W and the interfacial energy of carbide and matrix played important roles in the coarsening process. The carbides in the coarse-grained steels showed a bimodal size distribution after tempering, with coarse particles at high-angle grain boundaries (HAGBs) and fine particles at low-angle grain boundaries (LAGBs). The two-cell model successfully reproduced the coarsening kinetics of the bimodal-sized particles during aging.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
K. A. Rozman, R. P. Oleksak, O. N. Dogan, M. Detrois, P. D. Jablonski, J. A. Hawk
Summary: This research investigated the creep response of MARBN-type 9Cr martensitic steel in a gaseous CO2 environment and found that environmentally-assisted cracking was accelerated by carbide formation, leading to failure. The study highlights the importance of considering creep-oxidation interactions in materials selection for supercritical CO2 power systems, and suggests that more oxidation-resistant alloys will be necessary for the highest temperature portions of these systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Multidisciplinary
K. Maruyama, F. Abe, H. Sato, J. Shimojo, N. Sekido, K. Yoshimi
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2018)
Article
Materials Science, Multidisciplinary
F. Abe, M. Murata, H. Miyazaki
MATERIALS AT HIGH TEMPERATURES
(2019)
Article
Materials Science, Multidisciplinary
Fujio Abe, Toshio Ohba, Hideko Miyazaki, Yoshiaki Toda, Masaaki Tabuchi
MATERIALS AT HIGH TEMPERATURES
(2019)
Article
Materials Science, Multidisciplinary
Fujio Abe, Toshio Ohba, Hideko Miyazaki, Yoshiaki Toda, Masaaki Tabuchi
MATERIALS AT HIGH TEMPERATURES
(2019)
Article
Materials Science, Multidisciplinary
Y. Liu, S. Tsukamoto, H. Hongo, F. Yin, M. Tabuchi, F. Abe
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2019)
Article
Engineering, Mechanical
Fujio Abe
JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME
(2019)
Review
Materials Science, Multidisciplinary
Kota Sawada, Kazuhiro Kimura, Fujio Abe, Yasushi Taniuchi, Kaoru Sekido, Takehiro Nojima, Toshio Ohba, Hideaki Kushima, Hideko Miyazaki, Hiromichi Hongo, Takashi Watanabe
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
Fujio Abe
MATERIALS AT HIGH TEMPERATURES
(2020)
Article
Materials Science, Multidisciplinary
Fujio Abe
MATERIALS AT HIGH TEMPERATURES
(2020)
Article
Materials Science, Multidisciplinary
Fujio Abe
MATERIALS AT HIGH TEMPERATURES
(2020)
Article
Materials Science, Multidisciplinary
Fujio Abe
Summary: The creep rupture ductility of Gr.122 at high temperatures was investigated, with the results showing changes in RA and total elongation with increasing test duration.
MATERIALS AT HIGH TEMPERATURES
(2021)
Article
Materials Science, Multidisciplinary
Fujio Abe, Masaaki Tabuchi, Susumu Tsukamoto
Summary: Soluble boron stabilises fine distributions of M23C6 carbides near grain boundaries in 9Cr steel during creep, enhancing GB precipitation hardening and suppressing Type IV fracture in welded joints at 650(o)C. Excess addition of boron and nitrogen can degrade creep strength and rupture ductility. Adding appropriate amounts of boron and nitrogen can improve high-temperature creep strength and prevent Type IV fracture in welded joints, while pre-oxidation treatment in argon gas can enhance oxidation resistance.
MATERIALS AT HIGH TEMPERATURES
(2021)
Article
Engineering, Multidisciplinary
Kouichi Maruyama, Dave Dewees, Fujio Abe, Kyosuke Yoshimi
Summary: This paper discusses the revision of creep rupture life prediction equations for grade 91 steel and examines the revised equations using a large database. The equations show deviations from the data points in the long-term region, which can be reduced through a multi-region analysis of the database. Modifications are necessary when applying the analysis to a large database containing data points of multiple heats.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Fujio Abe, Toshio Ohba, Hideko Miyazaki, Yoshiaki Toda, Masaaki Tabuchi
JOINT EPRI - 123HIMAT INTERNATIONAL CONFERENCE ON ADVANCES IN HIGH-TEMPERATURE MATERIALS, 2019
(2019)
Article
Materials Science, Multidisciplinary
Fujio Abe, H. Kutsumi, H. Haruyama, H. Okubo
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)
