Article
Materials Science, Multidisciplinary
Xiaoou Zhu, Zhanqi Liu, Guili Yin, Haijiang Wang, Jingtao Ren
Summary: The influence of magnetic field on the microstructure and properties of laser wire-filled welded joints of 1.5 mm automotive 22MnB5 steel was investigated. The results showed that a 5 mT and 15 mT steady magnetic field promoted the flow of molten pool, reduced the width of the welded joint, decreased the grain size of the coarse grain region, and improved the overall hardness of the welded joint. However, different magnetic induction intensities had different effects on the solid phase transformation of the weld, with 15 mT inducing the formation of lath martensite and lower bainite, resulting in higher mechanical properties.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Youping Zhang, Youqiong Qin, Feng Zhao, Min Liang
Summary: To improve the performance of lap laser-welded Al-Si-coated 22MnB5 hot stamping steel/galvanized steel joints, variable thicknesses of Ni foil were added. The addition of Ni foil reduced the negative effects caused by the Al-Si coating and increased the strength and toughness of the joints.
Article
Materials Science, Multidisciplinary
Shuo Weng, Yuhui Huang, Mingliang Zhu, Fuzhen Xuan
Summary: This study investigated the microstructural evolution under low-cycle fatigue in base metal (BM) and weld metal (WM) of NiCrMoV steel welded joints through miniature tensile tests and microstructural observations. Results showed that the yield strength and ultimate tensile strength of both BM and WM decreased after low-cycle fatigue tests, attributed to reduction of dislocation density and formation of low-energy structures. However, the microstructural evolution mechanisms in BM and WM under the same cyclic loadings were different.
Article
Materials Science, Multidisciplinary
Baiyun Yang, Haoyue Li, Haofeng Sun, Wanting Xu, Hongbo Xia, Xuan Su, Bo Chen, Xiaoguo Song, Caiwang Tan
Summary: This study successfully created grooves of varying depths on the surface of Q355 steel using a nanosecond laser, and achieved satisfactory Al/Steel joints. The introduction of texture was found to enhance interfacial properties and reduce residual stress. The highest strength of 111 MPa was obtained in the joint with laser texturing processing times of 20, which was nearly 40% higher compared to the untreated joint.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Manufacturing
Xiaopei Wang, Weiting Li, Yingjie Yao, Luyao Fan, Jinhua Wang, Weiyi Wang, Pengyu Wen, Zhigang Yang, Hao Chen
Summary: In this study, low-density ultrahigh-strength steels (LD-UHSS) were designed and fabricated using laser powder bed fusion with in-situ alloying. The addition of aluminum reduced the density and significantly strengthened the LD-UHSS through the precipitation of the B2 phase. The laser additive manufacturing process resulted in the formation of fine metastable retained austenite, contributing to improved ductility. By tailoring key phases, the mechanical performance of LD-UHSS can be effectively optimized.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Lei Chen, Yu Zhang, Xiaodi Xue, Bingxu Wang, Jing Yang, Zhaoxia Zhang, Na Tyrer, Gary C. Barber
Summary: This research investigated the effects of welding current and welding time on the shearing strength of resistance spot-welded joints of low carbon steel and stainless steel plates. The findings suggest that specific welding parameters can result in the highest strength, and the diameter of welded joints and nuggets increases with increasing welding current and welding time.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Z. W. Wang, J. F. Zhang, G. M. Xie, L. H. Wu, H. Zhang, P. Xue, D. R. Ni, B. L. Xiao, Z. Y. Ma
Summary: This study investigated the microstructure and mechanical behavior of welded joints of ultrahigh-strength Q&P steels. The joints with equal strength to the parent metal were successfully fabricated using FSW technique. Apparent hardening was observed in the stir zone, while softening was observed in the heat-affected zone. The strength of the joints was minimally affected by parameter variation.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Optics
Wei Xu, Wu Tao, Haiwen Luo, Shanglu Yang
Summary: The effect of Al-Si coating on the weld bead formation, aluminum element distribution, microstructure, and mechanical properties of laser welded 22MnB5 steel joint was studied. It was found that increasing welding speed helped to reduce the concavity depth of the weld surface. The uneven distribution of aluminum element in the fusion zone during welding process resulted in softened weld and reduced hardness.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Wei Cheng, Xiaolei Zhang, Jinzhong Lu, Fengze Dai, Kaiyu Luo
Summary: The research found that laser oscillation welding can reduce spattering during the welding process, leading to a better macroscopic morphology, but slightly lower shear and tensile strengths in the welded joint.
Article
Optics
Oguz Tuncel, Hakan Aydin, Kemal Davut
Summary: This study examines the impact of heat input on the softening of the heat-affected zone (HAZ) in fiber laser welding of quenched 1.1 mm thick 22MnB5 steel. The study considers laser power (1500-2500 W) and welding speed (40-120 mm/s) as the input process variables. Results reveal that a minimum heat input of 50 J/mm is necessary for complete weld penetration. The research also finds that an increase in heat input leads to grain coarsening, which causes a 39% decrease in hardness in the HAZ region compared to the base material.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yifan Sun, Yuntao Li, Yanchang Qi, Xiaotao Cai, Chengyong Ma
Summary: In this study, Metal Inertia Gas (MIG) welding was used to weld two typical nickel-based alloys and 10Ni5CrMoV steel. The results showed that ERNiCrMo-3 welding wire has better performance in welding large thickness steel, while the ERNiCrMo-4 welding wire has higher hardness. These findings are of great significance for improving the welding quality of high-strength steel.
Article
Nanoscience & Nanotechnology
A. Seshu Kumar, Sk. Abdul Khadeer, V. Rajinikanth, Santanu Pahari, B. Ravi Kumar
Summary: In this study, rotary friction weld joints were prepared between carbon steel and low alloy steel pipes, revealing distinct weld microstructure characteristics and differences in mechanical properties based on different configurations. The use of quench and temper treatment on the low alloy steel resulted in improved bond interface strength, attributed to a synergistic effect of grain size refinement and tempered martensite microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Ming Li, Huajie Wu, Yanhui Sun
Summary: This study investigates the corrosion resistance of marine steel and finds that regions with uneven microhardness correspond to the inhomogeneity of corrosion potential. Nanoscale corrosive-aggressive non-metallic inclusions weaken the corrosion resistance of the steel. The study also shows that the deoxygenation process has an influence on the corrosion performance of welded joints and controlling the deposition composition can improve the corrosion resistance of the steel plate.
Article
Engineering, Mechanical
Toru Shiratsuchi, Naoki Osawa
Summary: This study proposed a fatigue life prediction method for welded joints taking into account geometric effects, differences in cyclic stress-strain properties between parent materials, heat-affected zones, and weld metals, as well as the mean stress effect of welding residual stress and fatigue loading. The method consists of finite element analyses involving welding simulation, nonlinear structural analysis under fatigue loading, and estimation of fatigue crack initiation and propagation. The proposed method was shown to successfully predict the fatigue life of 9% Ni steel butt welded joints.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Chemistry, Physical
Jian Sun, Tong Wang, Fuguang Liu, Zhoubo Zhang, Yunhui Chen, He Lin, Hui Liu, Xiaohui Zhao, Xiaole Cheng
Summary: This study investigates the microstructure evolution, microhardness, and tensile properties of TP304H/T22 dissimilar steel welded joints. The results show that the welded joints have no damaged features, and the weld has higher microhardness than the base metal. The welded joints fracture at the weld metal and TP304H base metal at room temperature and 550°C, respectively, exhibiting a change in fracture morphology from ductile to hybrid. This study is of significant reference value for assessing the safety and reliability of dissimilar steel welded joints in superheater units.
