Scholarlink

<p>This work of friction stir welding of ultra-low-carbon steel has been conducted with 300&#xa0;rpm tool revolution speed and 15-75&#xa0;mm/min tool traverse speed with 15&#xa0;mm/min stepped increased tool traverse speed. FEM-based thermal simulations were conducted to investigate the thermal history of the welded joints. 510&#xa0;°C peak temperature was obtained in the thermal simulation with 300&#xa0;rpm and 15&#xa0;mm/min, indicating the final microstructure of the welded joint will consist ferritic microstructure as the base metal. With increasing tool traverse speed, smaller equiaxed grains evolved in the stir zone. TiC precipitates were observed at the stir zone. However, the dislocation density increased with an increase in tool traverse speed. The maximum tensile strength was obtained with 15&#xa0;mm/min tool traverse speed of ~ 232&#xa0;MPa, which is less than that of the base metal. The microhardness profile revealed greater hardness at the stir zone as compared to other zones of the welded joints. The maximum corrosion rate was ~ 0.46&#xa0;mm/year at 75&#xa0;mm/min, and the minimum was ~ 0.08&#xa0;mm/year for the 15&#xa0;mm/min in a 3.5% NaCl solution. Gradual increase in corrosion rate has been noticed with increasing tool traverse speed. The corrosion rates have been found larger than that of base metal.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on Thermal Simulation, Microstructural, Mechanical, and Electrochemical Behavior of Ultra-Low-Carbon Steel Friction Stir Welded Joints

  • 期刊论文

  • 发表日期：

    2025年5月9日

查看全文
  • Ishita Koley,
  • Arindam Dhar,
  • Avinash Kumar,
  • Mainak Ghosh,
  • Sukumar Kundu

摘要

This work of friction stir welding of ultra-low-carbon steel has been conducted with 300 rpm tool revolution speed and 15-75 mm/min tool traverse speed with 15 mm/min stepped increased tool traverse speed. FEM-based thermal simulations were conducted to investigate the thermal history of the welded joints. 510 °C peak temperature was obtained in the thermal simulation with 300 rpm and 15 mm/min, indicating the final microstructure of the welded joint will consist ferritic microstructure as the base metal. With increasing tool traverse speed, smaller equiaxed grains evolved in the stir zone. TiC precipitates were observed at the stir zone. However, the dislocation density increased with an increase in tool traverse speed. The maximum tensile strength was obtained with 15 mm/min tool traverse speed of ~ 232 MPa, which is less than that of the base metal. The microhardness profile revealed greater hardness at the stir zone as compared to other zones of the welded joints. The maximum corrosion rate was ~ 0.46 mm/year at 75 mm/min, and the minimum was ~ 0.08 mm/year for the 15 mm/min in a 3.5% NaCl solution. Gradual increase in corrosion rate has been noticed with increasing tool traverse speed. The corrosion rates have been found larger than that of base metal.