Article
Nanoscience & Nanotechnology
Siyu Zhang, Qiang Zhang, Min Zheng, Yunlong Hu, Shang Sui, Jing Chen, Xin Lin
Summary: Increasing powder feed rate can effectively promote the columnar to equiaxed transition of Ti5Al2Sn2Zr4Mo4Cr titanium alloy during the LSF process, but excessively high powder feed rate does not further refine beta grains, especially near the fusion lines.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Manufacturing
Qimin Huang, Fenggang Liu, Chunping Huang, Xin Lin, Chun Xia, Zhitai Wang, Qifan You, Lixin Liu
Summary: Laser solid forming (LSF) technology has a significant impact on the manufacturing of aeronautical burn resistant titanium alloy Ti40. The Ti40 deposition blocks fabricated using LSF technique showed refined grain, precipitation of α phase and Ti5Si3 phase. The LSFed Ti40 alloy exhibited higher tensile and yield strengths compared to forged samples, and its elongation was similar to forged samples. The addition of Ti5Si3 improved oxidation efficiency and burn resistance of the Ti40 alloy.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Chemistry, Physical
Wenqing Yang, Yongnan Chen, Qinyang Zhao, Haifei Zhan, Yiku Xu, Fengying Zhang, Yongqing Zhao, Yuantong Gu
Summary: The burn resistant performance of Ti-Cu alloy was investigated, showing that sufficient Cu content can improve the resistance to burning, while inadequate Cu content can lower the burn resistance of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Giuseppe Casalino, Michelangelo Mortello
Summary: The study investigated the effects of welding parameters on the quality of laser-arc combined welding of 5754 magnesium aluminium alloy, and identified optimal process conditions to reduce porosity and improve key-hole stability in the welded joint. The phenomenon of grain boundary wetting was observed in the fused zone.
Article
Engineering, Mechanical
Z. Y. Ren, Y. L. Hu, Yonggang Tong, Z. H. Cai, Jian Liu, H. D. Wang, J. Z. Liao, S. Xu, L. K. Li
Summary: In order to enhance the microhardness and wear resistance of TC4 alloy, a NbMoTaWTi high-entropy alloy coating was produced on the surface of TC4 alloy through laser cladding. The coating exhibited a single BCC phase with fine dendrites dominating the top microstructure and petal-like coarse dendrites in the bottom near the interface. The microhardness of the coating reached 600 HV, 72% higher than that of the substrate. The coating's wear surface was smooth and adhered to abrasive material. The specific wear rate of the coating decreased by 121.9% compared to the substrate, with oxidative wear and adhesive wear being the primary wear mechanisms.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Qingdong Xu, Pengcheng Zhang, Lei Yang, Guomin Le, Shixiong He, Xinghui He, Xiangdong Liu, Wenyuan Wang
Summary: Thin-walled Be-38 wt%Al samples produced by laser solid forming exhibit well-defined microstructures with columnar Be grains delineated by continuous Al networks, leading to high ultimate tensile strength and yield strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Zhichao Sun, Lijiao Yin
Summary: This study investigated the bifurcation behavior and morphology of secondary alpha(GB) in TC18 titanium alloy. Two types of bifurcation behaviors, bi-direction bifurcation and tri-direction bifurcation, were observed. Bi-direction bifurcation mainly occurred in flat alpha(GB), while it was not observed in zig-zag alpha(GB).
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Oleksandr Tisov, Alina Yurchuk, Mykhaylo Pashechko, Iryna Pohreliuk, Dariusz Chocyk, Myroslav Kindrachuk
Summary: This paper investigates the microstructure, phase composition, and tribological response of BT22 bimodal titanium alloy samples. By selectively laser-processing the samples before nitriding, a nano-fine cell-type microstructure was achieved. The nitrided layer exhibited an average grain size of 300-400 nm, with some smaller cells measuring 30-100 nm. XRD tests confirmed the formation of Ti2N. The combined laser-thermochemical processing resulted in improved wear resistance compared to solely nitrided samples.
Article
Optics
Bowen Liu, Chunming Wang, Gaoyang Mi, Jun Wang, Wei Zhang, Xiong Zhang
Summary: The study investigated the effects of laser cleaning on the 5083 alloy, finding that changes in oxygen content and surface morphology evolution can affect welding quality. As energy density increased, morphological defects were gradually modified to form a striation morphology; the micromorphology after laser cleaning affects the stability of keyholes, thereby regulating process porosity.
OPTICS AND LASER TECHNOLOGY
(2021)
Review
Materials Science, Multidisciplinary
Weijun Liu, Wanqiu Li, Huiru Wang, Hongyou Bian, Kai Zhang
Summary: This study focuses on the surface modification methods of selective laser melting (SLM) implants to remove unmelted powder particles and improve the biological and mechanical properties of the implants. Chemical and electrochemical methods are commonly used for surface modification, which can enhance the implant performance while minimizing health risks.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Shan Liang, Ji Teng, Jinghui Li, Qiang Zhang, Jing Chen
Summary: In this study, the authors analyzed the microstructure evolution of TC17 titanium alloy formed by laser solid forming and investigated the influence of solution and two-stage aging heat treatment on microstructure homogenization and room temperature tensile properties. They found that increasing the temperature and time of heat treatment led to an increase in the size and volume fraction of primary lath alpha phase, but a decrease in the secondary alpha phase. Aging had no effect on grain morphology but caused coarsening of the primary alpha lath. The authors also found that the optimal strength and plasticity were achieved with a heat treatment process of 920°C/0.5 h/water quenching + 750°C/1 h/water quenching + 630°C/4 h/air cooling.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Optics
Zhenglong Lei, Yuan Chen, Heng Zhou, Xuefeng Wang, Jingtao Liu, Peiyun Xia
Summary: This study demonstrated that beam oscillation can improve the microstructures and mechanical properties of welded joints by affecting molten pool behaviors. The use of beam oscillation resulted in defect-free joints with sound weld appearances, higher probability of equiaxed grain formation, and significant grain refinement. Additionally, welded joints made using beam oscillation showed higher tensile strength and the occurrence of the Portevin-Le Chatelier effect due to the precipitation of brittle co phase at elevated temperatures.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Shan Liang, Jinghui Li, Qiang Zhang, Jing Chen
Summary: This paper investigates the microstructure evolution of TC17 titanium alloy prepared by laser stereo forming (LSF). The microstructure in deposited TC17 titanium alloy is significantly affected by the thermal cycle history during the LSF process. The metastable beta phase gradually evolves into alpha + beta phases due to thermal cycle during multi-layer deposition.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Engineering, Manufacturing
Kehuan Wang, Ke Song, Jie Zhao, Shanshan Cui, Chao Peng, Xiaosong Wang, Liliang Wang, Gang Liu
Summary: This paper investigates the effect of microstructure evolution of weld seam and base metal on the nonuniform deformation of welded titanium alloy blanks during hot forming process. Physically-based constitutive models are developed for both weld seam and base metal to improve the prediction accuracy of simulation.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Chemistry, Physical
Yachong Zhou, Xiaofeng Xu, Yang Zhao, Xudong Yan, Lai Wei, Zhicheng Wu, Yongqiang Yu
Summary: Fine grain strengthening is crucial for improving mechanical properties in titanium alloys. In this study, electroshock treatment was found to directly recrystallize coarse prior beta grains in alpha+beta titanium alloy, leading to enhanced tensile strength and elongation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
