Article
Materials Science, Multidisciplinary
A. Kumar, C. Pandey
Summary: This research investigates the effect of the ERNiCrCoMo-1 filler on the dissimilar welded joint of martensitic grade P92 steel and Ni-based superalloy Inconel 617. The study examines the solidification mechanism, microstructural characterization, welded joint integrity, and residual stresses. The findings provide insights into welding procedure development, microstructural evolution, mechanical properties, and residual stresses for the welded joint.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Yaqi Wang, Chendong Shao, Manjie Fan, Ninshu Ma, Fenggui Lu
Summary: Interfacial creep failure of steel/nickel dissimilar metal welded joints is strongly influenced by solidified grain boundaries, especially short boundaries that tend to form cavities, while long boundaries show fewer cavities. Controlling the presence of short boundaries and macrosegregation can improve the creep life of these joints.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Mingzhe Fan, Chendong Shao, Yaqi Wang, Xin Huo, Ninshu Ma, Fenggui Lu
Summary: The study revealed variations in local stress-strain behavior in tensile and creep-fatigue tests for 9Cr/CrMoV welded joint, including strain concentration shifts and crack initiation and propagation. These changes are mainly attributed to negative mean stress and different cyclic strains caused by stress relaxation.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Optics
Zhaoguo He, Dianwu Zhou, Xinyu Du, Xinyu Wang, Huiming Li, Jinshui Liu
Summary: Oscillating laser welding technology was used to improve the joint properties of AZ31B magnesium alloy and DP590 dual-phase steel by adding Ni powder to the prefabricated V-groove. The study revealed the influence of beam oscillation on energy distribution and grain size in the molten pool, as well as the improvement of joint performance. Under the optimal welding parameters, the tensile-shear property of the joint reached a maximum value of 2.2 kN, which was a 69.23% improvement compared to the no-oscillation mode. Beam oscillation improved the uniformity of laser energy distribution, suppressed defects such as pits and cracks, and increased the width of the molten pool.
Article
Materials Science, Multidisciplinary
Suo Li, Jian Li, Guangai Sun, Dean Deng
Summary: In this study, a butt-welded joint between P92 ferritic steel and SUS304 austenitic stainless steel was investigated. Finite element analyses were used to study the hardness and welding residual stress. Various factors influencing the formation of hardness and residual stress were considered, and the predicted results were in good agreement with the measurements. The effects of peak temperature, internal restraint, and differential thermal expansion were found to be decisive for the formation of residual stress.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
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
Ming Shu, Qin Zhou, Gang Li, Xue Liang, Hongliang Ming, Yongduo Sun, Xiaodong Lin, Jun Xiao
Summary: The addition of a trace amount of 20 ppm B significantly improved the creep performance of the 2.5Al-AFA alloy at 650 degrees C. Boron (B) preferentially distributed in the Laves phase and gradually diffused into the surrounding Laves phase at grain boundaries (GBs) through M23C6. Creep cracks propagated mainly along GBs, with the a phase serving as initiation sites. B accelerated the precipitation of Laves phase, resulting in improved GB strengthening and more effective suppression of a phase growth.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Jaromir Dlouhy, Eva Chvostova, Crtomir Donik
Summary: The formation of Laves phase was studied in experimental 10Cr-3 W-3Co creep-resistant steel, with comparisons made between thermal and creep exposure. Image analysis of micrographs was used to quantitatively analyze the Laves phase content, particle size, and morphology. Significant differences were observed, with thermal exposure resulting in the nucleation and coarsening of fine Laves phase particles, while creep exposure induced the formation of coarse particles from the early stages.
Article
Materials Science, Multidisciplinary
Jaromir Dlouhy, Eva Chvostova, Zbysek Novy
Summary: The evolution and coarsening of Laves phase in 10Cr-3W-3Co-1Mo nitrogen free creep resistant steels at temperature 650 degrees C was quantified. The influence of B content on Laves phase evolution and the formation of thin Laves phase films were investigated. The tensile tests at 650 degrees C did not show any detrimental effect of these films on the material plasticity.
Article
Nanoscience & Nanotechnology
Mingzhe Fan, Yaqi Wang, Xin Huo, Ninshu Ma, Fenggui Lu
Summary: The stress-controlled creep-fatigue test was conducted to investigate the damage mechanism for the CrMoV steel welded joint. It was found that the final fracture mode changed as the stress amplitude decreased and compressive holding was introduced, with the crack initiation and propagation occurring in different zones.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(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
Engineering, Mechanical
Matteo Benedetti, Mattia Orempuller, Francesca Russo, Vigilio Fontanari, Stefano Rossi
Summary: This study investigates the fatigue corrosion behavior of direct drive friction welded ASTM A105 and AISI 304L steels joints. The detrimental effect of the corrosive environment and the positive role played by the cathodic protection have been quantified. Different failure sites and mechanisms were observed for different corrosion fatigue conditions.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
A. Fedoseeva, I Nikitin, N. Dudova, R. Kaibyshev
Summary: The study investigated the coarsening of Laves phase in a 10% Cr-3% Co-3% W steel at 923 K, revealing that the strain during creep accelerates the depletion of tungsten from the ferrite matrix and the precipitation of Laves phase. The coarsening of Laves phase follows Ostwald ripening and is controlled by grain boundary diffusion, with growth observed on different boundaries and a significant contribution to creep behavior from dense chains of Laves phase on lath boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Yuxuan Song, Yi Ma, Haofeng Chen, Zhibo He, Hu Chen, Taihua Zhang, Zengliang Gao
Summary: This study investigated the creep-fatigue interactions on the long-term service damage of P92 welded joint by conducting tensile and compressive tests under different applied strains. Using nanoindentation, the local mechanical properties of the welded joint were examined, while scanning electron microscope was used to analyze fracture morphologies and internal defects after CF tests, revealing the effects of holding type on the local creep behavior and fracture mechanism of the welds.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Manufacturing
Jinpeng Hu, Fujun Cao, Yifu Shen, Chan Guo, Zhiyuan Yang
Summary: This study investigates the influence of different welding parameters on the microstructure and properties of dissimilar galvanized steel (GS) and mild steel Q235 friction stir welding joint. The experimental results show that a welding parameter of 800 rpm leads to a high tensile strength of 447.83 MPa, which is 104.15% of the base material, and an elongation of 17.2%, indicating good strength and toughness. EBSD results confirm the absence of zinc composition in the joints obtained after FSW, proving the effectiveness of milling properties. Temperature measurements during the FSW process demonstrate that the surface temperature remains below the boiling point of zinc, providing better protection of the galvanized layer.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2023)