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<p>In order to select a suitable welding wire for the 1700&#xa0;MPa grade armor steel, this study investigates the relationship between microstructure and mechanical properties of weld joints using austenitic wire and ferritic wire, respectively. The different microstructures of the weld zone of two joints were analyzed using OM, SEM and EBSD. The weld zone impact toughness of austenitic joint (13.3&#xa0;J at − 40&#xa0;°C) is four times than that of ferritic joint, but the yield strength and hardness of weld zone are only 581&#xa0;MPa and 198 HV, respectively. And its fracture position is in the fusion zone, which the austenite + martensite microstructure leads to good tensile strength (1191&#xa0;MPa). The ferritic joint has higher yield strength (1140&#xa0;MPa), tensile strength (1240&#xa0;MPa) and hardness (520 HV at weld zone) due to its martensite + bainite microstructure. Although the F joint exhibits a brittle fracture, the cross-shaped bainite microstructures ensure an adequate toughness. Both filler wires can successfully weld the 1700&#xa0;MPa grade armor steels. Generally, the austenitic filler wire has higher toughness and enough tensile strength, making it more suitable for parts with high requirements for impact resistance, such as the chassis of armored vehicles. The ferritic filler wire has higher strength and hardness, and it is suitable for the joints of the frontal protection parts of the vehicle body and other areas.</p>

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The Influence of Different Filler Wires on the Performance of Weld Joints of Grade 1700 MPa Armor Steel

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Xuhui Jin,
  • Wei Peng,
  • Shujiao Deng,
  • Jianxing Zhang,
  • Yao He,
  • Pengyue Gao,
  • Han Dong

摘要

In order to select a suitable welding wire for the 1700 MPa grade armor steel, this study investigates the relationship between microstructure and mechanical properties of weld joints using austenitic wire and ferritic wire, respectively. The different microstructures of the weld zone of two joints were analyzed using OM, SEM and EBSD. The weld zone impact toughness of austenitic joint (13.3 J at − 40 °C) is four times than that of ferritic joint, but the yield strength and hardness of weld zone are only 581 MPa and 198 HV, respectively. And its fracture position is in the fusion zone, which the austenite + martensite microstructure leads to good tensile strength (1191 MPa). The ferritic joint has higher yield strength (1140 MPa), tensile strength (1240 MPa) and hardness (520 HV at weld zone) due to its martensite + bainite microstructure. Although the F joint exhibits a brittle fracture, the cross-shaped bainite microstructures ensure an adequate toughness. Both filler wires can successfully weld the 1700 MPa grade armor steels. Generally, the austenitic filler wire has higher toughness and enough tensile strength, making it more suitable for parts with high requirements for impact resistance, such as the chassis of armored vehicles. The ferritic filler wire has higher strength and hardness, and it is suitable for the joints of the frontal protection parts of the vehicle body and other areas.