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<p>This study investigates the effect of heat treatment on the microstructure and mechanical properties of a bimetallic structure composed of stainless steel 316L (SS316L) and maraging steel 1.2709 (MSteel 1.2709), fabricated using laser powder bed fusion (LPBF). The as-fabricated sample underwent two heat treatment processes: (i) stress relief at 600&#xa0;°C (HT1) to reduce residual stresses and improve ductility, and (ii) solution treatment at 1000&#xa0;°C (HT2) to enhance tensile strength and hardness. Microstructural analysis revealed grain refinement and reduced dislocation density in HT1, while HT2 led to homogenization and martensitic transformation in MSteel 1.2709. Tensile testing confirmed that HT2 resulted in the highest strength due to precipitation strengthening, whereas HT1 provided a balance between strength and ductility. These findings highlight the potential of optimized heat treatments to enhance the performance of LPBF-fabricated bimetallic structures for advanced engineering applications.</p>

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Impact of Heat Treatment on Microstructure and Mechanical Properties of Bimetallic Structures Made from Stainless Steel 316L and Maraging Steel 1.2709 Using Additive Manufacturing

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • S. Ravi,
  • V. Satheeshkumar,
  • M. Kumaran

摘要

This study investigates the effect of heat treatment on the microstructure and mechanical properties of a bimetallic structure composed of stainless steel 316L (SS316L) and maraging steel 1.2709 (MSteel 1.2709), fabricated using laser powder bed fusion (LPBF). The as-fabricated sample underwent two heat treatment processes: (i) stress relief at 600 °C (HT1) to reduce residual stresses and improve ductility, and (ii) solution treatment at 1000 °C (HT2) to enhance tensile strength and hardness. Microstructural analysis revealed grain refinement and reduced dislocation density in HT1, while HT2 led to homogenization and martensitic transformation in MSteel 1.2709. Tensile testing confirmed that HT2 resulted in the highest strength due to precipitation strengthening, whereas HT1 provided a balance between strength and ductility. These findings highlight the potential of optimized heat treatments to enhance the performance of LPBF-fabricated bimetallic structures for advanced engineering applications.