Scholarlink

<p>Alloy 718 retains its mechanical properties at elevated temperatures. Furthermore, its weldability contributes to compatibility with additive manufacturing (AM) techniques such as powder bed fusion-laser beam (PBF-LB). In this study, various heat treatments, including stress relief, hot isostatic pressing (HIP), solution treatment, and aging, were applied to Alloy 718 manufactured by PBF-LB, and the stress-rupture life was investigated, as well as the effect of V-notch on its properties. The heat-treated materials exhibited longer stress-rupture life compared to the as-built material. However, significant anisotropy was observed due to the needle-like <i>δ</i> phase precipitated along the grain boundaries. Furthermore, material subjected to a different heat treatment conditions without <i>δ</i> phase precipitates promoted isotropic behavior. At the same time, notched specimens showed anisotropic stress-rupture life due to the interaction between crystallographic texture and stress state at the V-notch root.</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

Effect of Recrystallized Microstructure on Stress Rupture Behavior and Notch Sensitivity of Powder Bed Fusion-Laser Beam Manufactured Alloy 718

  • 期刊论文

  • 发表日期：

    2025年9月23日

查看全文
  • Y. Hashimoto,
  • M. Neikter,
  • P. Harlin,
  • H. Brodin,
  • Y. Miyashita

摘要

Alloy 718 retains its mechanical properties at elevated temperatures. Furthermore, its weldability contributes to compatibility with additive manufacturing (AM) techniques such as powder bed fusion-laser beam (PBF-LB). In this study, various heat treatments, including stress relief, hot isostatic pressing (HIP), solution treatment, and aging, were applied to Alloy 718 manufactured by PBF-LB, and the stress-rupture life was investigated, as well as the effect of V-notch on its properties. The heat-treated materials exhibited longer stress-rupture life compared to the as-built material. However, significant anisotropy was observed due to the needle-like δ phase precipitated along the grain boundaries. Furthermore, material subjected to a different heat treatment conditions without δ phase precipitates promoted isotropic behavior. At the same time, notched specimens showed anisotropic stress-rupture life due to the interaction between crystallographic texture and stress state at the V-notch root.