Mr. Jianmin Li Profile

Jianmin Li

at Beijing Univ of Technology

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Proceedings Article | 27 November 2023 Poster + Paper

Microstructure and mechanical properties of double-sided welded joints in MX246A high-temperature alloy

Jianmin Li, Dongyun Zhang, Shuo Geng, Yujing Chi, Denghao Yi

Proceedings Volume 12762, 127620T (2023) https://doi.org/10.1117/12.2685437

KEYWORDS: Alloys, Laser welding, Materials properties, Laser microstructuring, Dendrites, Metals, Scanning electron microscopy, Chemical composition, Manufacturing, Laser crystals

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In this paper, the microstructure and properties of MX246A alloy laser double-sided welding were studied. Different alloy welding structures were obtained under different laser powers, and the fine-grain zone, columnar-grain zone, and equiaxed-grain zone in the welding structure were analyzed. According to the results of SEM, it was found that the width of the surface fine-grain zone was generally thin, which had little effect on the quality and properties of the welded joint. The quality and properties of the welded joint mainly depended on the proportion of columnar-grain zone and equiaxed- grain zone, as well as the grain size. Moreover, with the increase of laser power density, the number of columnar grains decreased, while the number of equiaxed grains increased. The grain size of equiaxed grains became smaller, and the structure became denser, resulting in better mechanical properties. The double-sided welding was subjected to high-temperature and room-temperature tensile tests. The Laser welding double-sided tensile properties test showed that the tensile strength was 555 MPa at room temperature and 400 MPa at 1000 °C under the laser power intensity of 1704 W/mm² . The study revealed that MX246A alloy exhibited superior tensile properties and microhardness than the substrate, while the microstructure demonstrated excellent high-temperature durability.

Proceedings Article | 16 December 2022 Poster + Paper

Research on the formation mechanism of thermal crack for laser welding of IC 10 alloy

Jianmin Li, Dongyun Zhang, Denghao Yi, Shuo Geng, Xingtao Feng

Proceedings Volume 12312, 123120Y (2022) https://doi.org/10.1117/12.2655546

KEYWORDS: Crystals, Laser welding, Metals, Laser crystals

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In this paper, the IC10 alloy joints are prepared by laser welding. The effect of process parameters on thermal crack is discussed, and the formation mechanism of welding thermal crack in different types during laser welding of IC10 alloy are analyzed by micro means. The microstructure, element distribution and phase composition of the thermal cracks are studied. When the laser scanning direction is perpendicular to the grain growth direction of the substrate, the crack sensitivity is greater. With the increase of laser power and the decrease of shielding gas flowing, the crack sensitivity is also greater. A faster welding speed could cause thermal stress and increase crack sensitivity. The choice in an appropriate laser scanning speed range could effectively control the tendency of crack formation. According to the analysis of the formation mechanism of different cracks, the results of SEM and EDS showed that IC10 alloy was susceptible to crystallization cracking due to the high content of low melting point eutectic between grains and grain boundaries, and the tendency to produce liquefaction crack becomes greater when coarse carbides precipitate, both types of cracks belong to the thermal cracks caused by liquid films. In IC10 alloy, ductility dip cracking (DDC) is thermal crack caused by the sharp drop of intergranular plasticity, which is closely related to the state of grain boundaries and interstitial phase precipitated from grain boundary. The crack susceptibility of DDC cracks is easier to control than the above mentioned two type thermal cracks.

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