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<p>G115 steel was prepared by laser additive manufacturing (LAM) and the deposited blocks were heat-treated (HT) to improve the microstructure and properties. The effects of HT on the mechanical properties of LAM G115 steel were evaluated by uniaxial tensile (UT) and small punch tensile (SPT) tests. In addition, impact toughness and hardness tests were performed. The results showed that the strength and hardness of G115 decreased, plasticity increased and impact toughness increased after HT. HT increased the carbide precipitation phases, roughened the martensitic laths and decreased the dislocation density. The effect of defects and microstructure on the mechanical properties was analyzed, the martensite laths width and dislocation density had the greatest effect on the properties, and metallurgical defects acted as a hindrance to the properties. The relational equations between the results of SPT with UT test were established, while the hardness could be expressed by the SPT results as well. Moreover, the yield strength of AM G115 steel in the as-deposited (AD) state and at HT was estimated from microscopic observations and was similar to the actual results.</p>

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Evaluation of Mechanical Properties of Heated Laser Additive Manufactured G115 via Small Punch Test

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • Xun Wang,
  • Lianyong Xu,
  • Haiting Jia,
  • Bianyang Wu,
  • Lei Zhao,
  • Yongdian Han,
  • Zhiyu Jia

摘要

G115 steel was prepared by laser additive manufacturing (LAM) and the deposited blocks were heat-treated (HT) to improve the microstructure and properties. The effects of HT on the mechanical properties of LAM G115 steel were evaluated by uniaxial tensile (UT) and small punch tensile (SPT) tests. In addition, impact toughness and hardness tests were performed. The results showed that the strength and hardness of G115 decreased, plasticity increased and impact toughness increased after HT. HT increased the carbide precipitation phases, roughened the martensitic laths and decreased the dislocation density. The effect of defects and microstructure on the mechanical properties was analyzed, the martensite laths width and dislocation density had the greatest effect on the properties, and metallurgical defects acted as a hindrance to the properties. The relational equations between the results of SPT with UT test were established, while the hardness could be expressed by the SPT results as well. Moreover, the yield strength of AM G115 steel in the as-deposited (AD) state and at HT was estimated from microscopic observations and was similar to the actual results.