Scholarlink

<p>The present study focuses on the evolution of prior particle boundaries (PPB) and grain growth in a Ni-based superalloy processed by Spark Plasma Sintering (SPS) and their influence on ductility. Ni-based superalloys made by Powder Metallurgy present powder heredities such as inclusions at prior particle boundaries (PPBs) that are detrimental to mechanical properties because there are preferential sites for crack initiation. Some previous works tried to remove these PPBs in the final microstructure with different techniques, especially using grain growth. The following strategy has been undertaken using a new Ni-based superalloy densified by SPS and heat treated in the super-solvus and the super-solidus domains. Tensile tests and microstructural characterisations (SEM, EBSD and EDS) have been performed on as-SPS and after the two aforementioned heat treatments. Grain growth enables the reduction of PPB structures but does not improve high-temperature ductility.</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

Ductility Dependence of a Ni-Based Superalloy Made by Spark Plasma Sintering on Prior Particle Boundaries and Grain Size

  • 期刊论文

  • 发表日期：

    2026年3月6日

查看全文
  • Rémi Lebot,
  • Emmanuel Saly,
  • David Mellier,
  • Pierre Sallot,
  • Gautier huser,
  • Patrick Villechaise,
  • Jonathan Cormier

摘要

The present study focuses on the evolution of prior particle boundaries (PPB) and grain growth in a Ni-based superalloy processed by Spark Plasma Sintering (SPS) and their influence on ductility. Ni-based superalloys made by Powder Metallurgy present powder heredities such as inclusions at prior particle boundaries (PPBs) that are detrimental to mechanical properties because there are preferential sites for crack initiation. Some previous works tried to remove these PPBs in the final microstructure with different techniques, especially using grain growth. The following strategy has been undertaken using a new Ni-based superalloy densified by SPS and heat treated in the super-solvus and the super-solidus domains. Tensile tests and microstructural characterisations (SEM, EBSD and EDS) have been performed on as-SPS and after the two aforementioned heat treatments. Grain growth enables the reduction of PPB structures but does not improve high-temperature ductility.