Article
Nanoscience & Nanotechnology
S. Collomb, P. Gressel, J. Ghanbaja, A. Jacques
Summary: This study investigates the evolution of microstructure in Grade 91 steel welded joints during creep. Interrupted creep tests were conducted with various characterization techniques to analyze the changes in the InterCritical Heat Affected Zone (ICHAZ). The results provide insights into the quantitative evolution of microstructure factors and their impact on plastic deformation during the creep test.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Pei-Shan Ding, Xiao-Tao Zheng
Summary: The creep-ratcheting behavior of advanced 9-12 % Cr ferritic steel at 600 degrees C under different peak holding times was investigated, and a corresponding creep-ratcheting constitutive model was developed. Results showed that the anelastic strain remains relatively constant for different holding times, but decreases rapidly during the last several cycles. Moreover, the study observed the behavior of primary creep regeneration during repeated loading and unloading, which remains almost the same with increasing number of cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Yufen Gu, Na Lu, Youwei Xu, Yu Shi, Gang Zhang, Qingling Sun
Summary: The evolution of joint-microstructure characteristics during multipass welding of medium and heavy Q345R plates was analyzed. The corrosion characteristics were investigated in a hydrofluoric acid environment. The study provides effective ways to improve the corrosion resistance of Q345R steel.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Sanjeev Kumar, Chandan Pandey, Amit Goyal
Summary: The paper investigates the microstructure and mechanical behavior of P91 welded joint produced by gas tungsten arc welding process using Inconel 718 filler. The microstructural changes in weld fusion zone and heat-affected zone were studied for varying heat treatment conditions. The tensile properties, hardness, and Charpy impact toughness of the welded joint were also analyzed for different conditions, showing significant changes in microstructure and mechanical properties.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Construction & Building Technology
Ahmad H. El Ghor, Mohammed Ali Morovat, Michael D. Engelhardt, Elie G. Hantouche
Summary: This paper summarizes the preliminary results of an experimental investigation on the creep behavior of transverse welded lap joints at elevated temperatures. The results show that transverse welded lap joints undergo excessive deformation due to creep at high temperatures, and the creep effect becomes more significant as temperature and load increase.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Mechanics
Yanyan Huang, Xiaowu Luo, Yucun Zhan, Yan Chen, Liping Yu, Wei Feng, Jiankun Xiong, Jianping Yang, Guijun Mao, Lin Yang, Fuheng Nie
Summary: This study investigates the creep rupture behavior and microstructure changes of dissimilar welded joints of two types of martensitic heat resistant steel: F92 and Co3W2. The results indicate that the fracture position and mode change from transgranular ductile fracture in parent F92 to intergranular brittle fracture in the fine grain heat affected zone near F92, with the decrease of applied stress. The study also reveals the microstructural degradation caused by creep, including the decrease in dislocation density, precipitates coarsening, formation of dislocation cells, microvoids, macroscopic secondary cracks, and changes in fracture surface morphology.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Chemistry, Physical
Maohong Yang, Zheng Zhang, Linping Li
Summary: This paper investigated the evolution of microstructure and microhardness in the G115/Sanicro25 dissimilar steel welded joint during the creep process. The results showed that fracture locations were in the fine-grain heat-affected zone, and the cavities were related to the second phase.
Article
Materials Science, Multidisciplinary
P. Vaishali, Vani Shankar
Summary: This study aims to investigate the deformation and damage of P91 steel weld joints under different creep-fatigue combinations. Location-specific damage was assessed through evaluating the particles and their cavitation propensity in the steel, showing that short creep holds have more damaging effects on strength loss.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Engineering, Mechanical
Yuxuan Song, Yi Ma, Zhouxin Pan, Yuebing Li, Taihua Zhang, Zengliang Gao
Summary: In this study, the interaction of creep-fatigue on P92 steel welded joints was investigated through strain-controlled CF tests. It was found that CF specimens with short dwell times displayed characteristic fatigue-induced damage. The specimens subjected to CF tests showed lower hardness, elastic modulus, and creep strength compared to specimens with post-weld heat treatment, with increased strain rate sensitivities observed after secondary creep testing.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2021)
Article
Mathematics, Interdisciplinary Applications
Lian Song, Genfeng Li, Cong Zhu, Huaqiang Fang, Guoqing Zhu
Summary: This study investigates the ductile fracture of Q345 steel welded joint, establishes the constitutive model and fracture criterion model, and provides experimental parameters for the mechanical properties and fracture models of welded joints in structural engineering. These findings contribute to refined finite element models and the evaluation and design of building structures.
Article
Construction & Building Technology
Jianbo Jiang, Huiyong Ban, Letian Hai, Chenyang Huang
Summary: Titanium-clad bimetallic steel is gaining attention in ocean/coastal civil and structural engineering due to its corrosion resistance and load-bearing capacity. However, the mechanical behaviors of weld joints in this type of steel are still unclear. This paper investigates the tensile mechanical behavior of two types of weld joints and compares them with the parent material, providing insights for the structural design of welded titanium-clad bimetallic steel structures.
Review
Engineering, Mechanical
Marcello A. Lepore, Angelo R. Maligno, Filippo Berto
Summary: This study employed finite element modeling to simulate creep-fatigue crack propagation in Compact Tension C(T) specimens made of P91 steel at high temperatures, successfully comparing numerical and experimental results, and proposing a general methodology for simulation.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Mechanical
Guanzhi Wu, Kai Ding, Tao Wei, Shangfei Qiao, Xia Liu, Yulai Gao
Summary: The study found a specific relationship between rupture time and stress in the Inconel 625-9% Cr steel dissimilar welded joints, with the presence of a significant number of microvoids in 9Cr-HAZ contributing to the fracture.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Chemistry, Physical
Stanislaw Mrozinski, Zbigniew Lis, Halina Egner
Summary: This paper presents the results of tests on P91 steel samples under the conditions of simultaneous fatigue and creep. The study shows that creep significantly reduces the durability of the samples. It also suggests that considering the influence of creep in the linear fatigue damage summation approach can improve the accuracy of fatigue life predictions.
Article
Engineering, Civil
Qiyu Li, Congbai Xu, Zhicheng Luo, Fenghua Huang, Xiangsheng Zang, Dachang Zhang
Summary: This paper investigates the fatigue performance of Q420C steel fillet-welded joints at low temperatures. Tensile tests and Charpy V-notch tests were conducted to assess the mechanical properties of the joints under room and low temperatures. It was found that the yield and ultimate strengths increased as the temperature decreased from 20 degrees C to -50 degrees C. The fatigue test revealed that the fatigue life increased at low-stress range but decreased at high-stress range as the temperature decreased from room temperature to -40 degrees C. At -50 degrees C, the fatigue life showed a declining trend for all stress ranges compared to that at -40 degrees C.
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)