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<p>The effect of Ni, Cu, and Co austenitic elements on the structure and mechanical properties of laser lap welded 22MnB5 steel joints was studied. The goal was to relieve the damage of Al accumulation within the weld and improve the joint’s strength. This study first systematically compared the effects of three austenitic elements (Ni, Cu, and Co) on the microstructure and mechanical properties of laser welded joints. Unlike previous studies focusing on single element additions, this work explored the comparative effectiveness of these elements. Results showed that the addition of Ni, Cu, and Co significantly reduced the quantity and dimensions of δ-ferrite, with Ni exhibiting the best performance, followed by Cu and Co. JMatPro simulation revealed that Ni's superior performance was due to its broader peritectic transformation temperature range (1434-1444&#xa0;°C) and higher phase transformation temperature. The tensile strength improved from 361&#xa0;MPa (no foil) to 482&#xa0;MPa (Ni), 429&#xa0;MPa (Cu), and 395&#xa0;MPa (Co), respectively.</p>

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Microstructural Characteristics and Mechanical Properties of Laser Welded Al-Si Coated 22MnB5 Steel Joints Under Different Austenitic Elements

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Tao Chen,
  • Youqiong Qin,
  • Youping Zhang,
  • Chenduo Ji

摘要

The effect of Ni, Cu, and Co austenitic elements on the structure and mechanical properties of laser lap welded 22MnB5 steel joints was studied. The goal was to relieve the damage of Al accumulation within the weld and improve the joint’s strength. This study first systematically compared the effects of three austenitic elements (Ni, Cu, and Co) on the microstructure and mechanical properties of laser welded joints. Unlike previous studies focusing on single element additions, this work explored the comparative effectiveness of these elements. Results showed that the addition of Ni, Cu, and Co significantly reduced the quantity and dimensions of δ-ferrite, with Ni exhibiting the best performance, followed by Cu and Co. JMatPro simulation revealed that Ni's superior performance was due to its broader peritectic transformation temperature range (1434-1444 °C) and higher phase transformation temperature. The tensile strength improved from 361 MPa (no foil) to 482 MPa (Ni), 429 MPa (Cu), and 395 MPa (Co), respectively.