Scholarlink

<p>Inconel 718 superalloy was additive-manufactured (AM) using laser directed energy deposition (L-DED), and the effects of post-AM heat treatments on microstructure, hardness, and wear properties were investigated. Microstructural analysis revealed equiaxed microstructures in the as-built (AB) sample, with columnar dendrites observed along the deposition direction. Laves phase was present in the AB and direct double-aged (DDA) samples, whereas other heat treatments led to its dissolution. Additionally, γ′ and γ″ precipitates were identified in aged samples, contributing to the elevation of hardness levels. The DDA condition exhibited the highest microhardness and ultimate tensile strength, surpassing the AB sample by about 46% and 52%, respectively. Based on its superior hardness, wear experiments were conducted on DDA samples under varying loads and sliding distances in comparison with the baseline AB condition. Abrasive wear was the dominant mechanism in both samples, though DDA condition demonstrated superior wear resistance, displaying reduced wear track width and depth levels as compared to those of AB. The findings of this study underscore the efficacy of DDA treatment in post-AM thermal processing of L-DED Inconel 718 for high performance components where enhanced hardness and wear resistance are critical.</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

Influence of heat treatment on the microstructural evolution and wear performance of additive-manufactured superalloy

  • 期刊论文

  • 发表日期：

    2026年1月28日

查看全文
  • Huzaifa Asif,
  • Guney Guven Yapici

摘要

Inconel 718 superalloy was additive-manufactured (AM) using laser directed energy deposition (L-DED), and the effects of post-AM heat treatments on microstructure, hardness, and wear properties were investigated. Microstructural analysis revealed equiaxed microstructures in the as-built (AB) sample, with columnar dendrites observed along the deposition direction. Laves phase was present in the AB and direct double-aged (DDA) samples, whereas other heat treatments led to its dissolution. Additionally, γ′ and γ″ precipitates were identified in aged samples, contributing to the elevation of hardness levels. The DDA condition exhibited the highest microhardness and ultimate tensile strength, surpassing the AB sample by about 46% and 52%, respectively. Based on its superior hardness, wear experiments were conducted on DDA samples under varying loads and sliding distances in comparison with the baseline AB condition. Abrasive wear was the dominant mechanism in both samples, though DDA condition demonstrated superior wear resistance, displaying reduced wear track width and depth levels as compared to those of AB. The findings of this study underscore the efficacy of DDA treatment in post-AM thermal processing of L-DED Inconel 718 for high performance components where enhanced hardness and wear resistance are critical.