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<p>In aerospace applications, ultra-high-strength low-alloy steels are extensively employed due to their superior mechanical performance, manufacturability, and cost-effectiveness. Among these materials, 15CDV6 steel is widely used owing to its ability to develop a predominantly lower bainitic microstructure in the oil-hardened and tempered condition. In the present study, the mechanical behavior of TIG-welded 15CDV6 steel joints was systematically evaluated under different post-weld heat-treatment conditions. Detailed microstructural characterization was carried out across the weld metal, heat-affected zone, and base material, and the resulting mechanical properties were correlated with the observed microstructural features. Microhardness profiles were generated across the welded joints to assess local variations in hardness induced by welding and subsequent heat treatments. In addition, x-ray diffraction-based residual stress analysis was performed on welded specimens subjected to various heat-treatment cycles to elucidate the evolution and redistribution of residual stresses. The experimental findings were critically analyzed and correlated with established metallurgical principles to provide a comprehensive understanding of the influence of heat treatment on the structure property relationships and performance of 15CDV6 steel weldments.</p>

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Effect of Welding Induced Microstructural Evolution on the Mechanical Properties of High-Strength 15CDV6 Steel for Aerospace Applications

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Mudda Nirish,
  • D. Anil Kumar,
  • R. Rajendra

摘要

In aerospace applications, ultra-high-strength low-alloy steels are extensively employed due to their superior mechanical performance, manufacturability, and cost-effectiveness. Among these materials, 15CDV6 steel is widely used owing to its ability to develop a predominantly lower bainitic microstructure in the oil-hardened and tempered condition. In the present study, the mechanical behavior of TIG-welded 15CDV6 steel joints was systematically evaluated under different post-weld heat-treatment conditions. Detailed microstructural characterization was carried out across the weld metal, heat-affected zone, and base material, and the resulting mechanical properties were correlated with the observed microstructural features. Microhardness profiles were generated across the welded joints to assess local variations in hardness induced by welding and subsequent heat treatments. In addition, x-ray diffraction-based residual stress analysis was performed on welded specimens subjected to various heat-treatment cycles to elucidate the evolution and redistribution of residual stresses. The experimental findings were critically analyzed and correlated with established metallurgical principles to provide a comprehensive understanding of the influence of heat treatment on the structure property relationships and performance of 15CDV6 steel weldments.