Optimization Study of Hot Isostatic Pressing Process for Powder Metallurgy Inconel 718 Alloy

JIANG Yuhui; XU Lei; YAO Hongrui; WU Jie; TIAN Xiaosheng

doi:10.16080/j.issn1671-833x.20240451

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Optimization Study of Hot Isostatic Pressing Process for Powder Metallurgy Inconel 718 Alloy

更新时间：2026-04-14

- Optimization Study of Hot Isostatic Pressing Process for Powder Metallurgy Inconel 718 Alloy
- Aeronautical Manufacturing Technology Vol. 69, Issue 4, (2026)
- 作者机构：
  
  1. 沈阳化工大学,沈阳,110142
  2. 中国科学院金属研究所师昌绪先进材料创新中心,沈阳,110016
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671-833x.20240451
  CLC：
- Published：2026
- 稿件说明：
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JIANG Yuhui, XU Lei, YAO Hongrui, et al. Optimization Study of Hot Isostatic Pressing Process for Powder Metallurgy Inconel 718 Alloy[J]. Aeronautical Manufacturing Technology, 2026, 69(4).
DOI：

JIANG Yuhui, XU Lei, YAO Hongrui, et al. Optimization Study of Hot Isostatic Pressing Process for Powder Metallurgy Inconel 718 Alloy[J]. Aeronautical Manufacturing Technology, 2026, 69(4). DOI： 10.16080/j.issn1671-833x.20240451.

摘要

Inconel 718 预合金粉末采用无坩埚感应熔炼超声气体雾化法制备，通过热等静压+ 特殊高温热处理制备粉末冶金Inconel 718 合金，观察其显微组织并测试其力学性能。研究结果表明，特殊高温热处理对于原始颗粒边界具有一定的消除作用，进而提高粉末冶金Inconel 718 合金的延伸率和冲击功。在此基础上，设计新的热等静压工艺，延长高温段保温时间。改进后的热等静压工艺可以在一定程度上抑制或消除粉末冶金Inconel 718 合金中的原始颗粒边界，增加孪晶数量，改善合金力学性能，其中650 ℃延伸率由6% 提升到10%。该工艺可以作为传统热等静压+特殊高温热处理的替代工艺，实现一次成形，达到降本增效的目的。

Abstract

Inconel 718 pre-alloyed powder was prepared by electrode induction melting gas atomization (EIGA). Powder metallurgy (PM) Inconel 718 alloy was formed by hot isostatic pressing (HIP) + special high temperature heat treatment (SHT) and then its microstructure was observed and its mechanical properties were tested. The results show that the SHT can reduce prior particle boundaries (PPBs) and improve the elongation and impact toughness of PM Inconel 718 alloy. Based on the SHT

the holding time of the high-temperature section is extended and the HIP is optimized. The optimized process can inhibit or eliminate PPBs in PM Inconel 718 alloy

increase the number of twins

and improve the alloy properties. The tensile elongation at 650 ℃ has been increased from 6% to 10%. The optimized HIP can be used as an alternative process to HIP + SHT to achieve near-net-shape and achieve the purpose of cost reduction and efficiency increase.

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