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<p>In this paper, the convention current mode and pulse current mode of metal inert gas (MIG) were used to repair the TC4 titanium alloy with the different size of cracks. The forming quality of the repaired zone was detected by the RF 100EGB x-ray flaw. The microstructure, grain size, and orientation deviation were observed by OM, SEM, and EBSD. Microhardness and tensile test were carried out by the HVS-1000 Vickers microhardness tester and WDW-100 microcomputer controlled universal testing machine. In order to analyze the fracture mechanism, the fracture morphology was observed by SEM. The results showed that under the action of periodically varying forces, the size of the α' martensite of the P-MIG repaired specimens were smaller than that of the C-MIG repaired specimens. When the notch width was 2&#xa0;mm, the average grain size of α' martensite of the C-MIG repaired specimens and the P-MIG repaired specimens were approximately 10.2 and 6.1&#xa0;μm, respectively. The maximum texture strength and the large angle grain boundaries proportion of the P-MIG repaired specimens were lower than that of the C-MIG repaired specimens. In terms of mechanical properties, the P-MIG repaired specimens achieved higher Vickers microhardness and tensile strength values relative to the C-MIG repaired ones. A large number of cleavage steps, river patterns, and dimples were observed on the whole tensile fracture of both the C-MIG repaired specimens and P-MIG repaired specimens, which belongs to ductile and brittle mixed fracture mode.</p>

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Microstructure and Mechanical Properties of TC4 Titanium Alloy Repaired by Metal Inert Gas under Different Current Modes

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Huijing Zhang,
  • Long Miao,
  • Ying Han

摘要

In this paper, the convention current mode and pulse current mode of metal inert gas (MIG) were used to repair the TC4 titanium alloy with the different size of cracks. The forming quality of the repaired zone was detected by the RF 100EGB x-ray flaw. The microstructure, grain size, and orientation deviation were observed by OM, SEM, and EBSD. Microhardness and tensile test were carried out by the HVS-1000 Vickers microhardness tester and WDW-100 microcomputer controlled universal testing machine. In order to analyze the fracture mechanism, the fracture morphology was observed by SEM. The results showed that under the action of periodically varying forces, the size of the α' martensite of the P-MIG repaired specimens were smaller than that of the C-MIG repaired specimens. When the notch width was 2 mm, the average grain size of α' martensite of the C-MIG repaired specimens and the P-MIG repaired specimens were approximately 10.2 and 6.1 μm, respectively. The maximum texture strength and the large angle grain boundaries proportion of the P-MIG repaired specimens were lower than that of the C-MIG repaired specimens. In terms of mechanical properties, the P-MIG repaired specimens achieved higher Vickers microhardness and tensile strength values relative to the C-MIG repaired ones. A large number of cleavage steps, river patterns, and dimples were observed on the whole tensile fracture of both the C-MIG repaired specimens and P-MIG repaired specimens, which belongs to ductile and brittle mixed fracture mode.