均匀化处理对GH4706合金析出相回溶行为的影响

doi:10.13251/j.issn.0254-6051.2026.02.024

金属热处理 ›› 2026, Vol. 51 ›› Issue (2): 163-168.DOI: 10.13251/j.issn.0254-6051.2026.02.024

均匀化处理对GH4706合金析出相回溶行为的影响

侯翔益¹, 杨国涛¹, 王冲², 段然³, 廉心桐¹, 黄烁³

1.上海大学材料科学与工程学院, 上海 200444;
2.东北大学材料科学与工程学院, 辽宁沈阳 110004;
3.北京钢研高纳科技股份有限公司, 北京 100081

收稿日期:2025-08-20 修回日期:2025-12-18 发布日期:2026-03-05
通讯作者: 廉心桐,副研究员,博士,E-mail:xtlian@shu.edu.cn
作者简介:侯翔益(2003—),男,硕士研究生,主要研究方向为高温合金组织性能演变,E-mail:houxiangyi@shu.edu.cn。
基金资助:
国家重点研发计划(2022YFB3705104)

Effect of homogenizing on dissolution behavior of precipitated phases of GH4706 alloy

Hou Xiangyi¹, Yang Guotao¹, Wang Chong², Duan Ran³, Lian Xintong¹, Huang Shuo³

1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
2. School of Materials Science and Engineering, Northeastern University, Shenyang Liaoning 110004, China;
3. Gaona Aero Material Co., Ltd., Beijing 100081, China

Received:2025-08-20 Revised:2025-12-18 Published:2026-03-05

摘要/Abstract

摘要： GH4706合金中的Nb、Ti等高熔点元素易在铸态组织中发生偏析,采用光学显微镜(OM)、扫描电镜(SEM)和二次离子质谱仪(TOF-SIMS)等手段研究了不同温度均匀化处理(1060、1080、1100、1120、1140和1160 ℃保温1 h,水冷)对GH4706合金铸态组织及析出相回溶的影响规律。结果表明,铸态组织存在严重的枝晶偏析,伴随有大量的低熔点相,如块状Laves相、细小γ+γ′共晶相和针状η相。在1060 ℃均匀化处理后,可消除细小γ+γ′共晶相;1100 ℃下针状η相完全回溶、Laves相发生明显回溶;1140 ℃下仅剩极少量Laves相,但其在1160 ℃下发生局部初熔。均匀化温度低于1100 ℃时,元素偏析随着均匀化温度的提高持续改善;当均匀化温度高于1100 ℃,由于Laves相发生回溶,Nb和Ti的偏析系数增大。

关键词: GH4706合金, 铸态组织, 元素偏析, 均匀化工艺

Abstract: High melting point elements such as Nb and Ti in GH4706 alloy are prone to segregate in the as-cast microstructure. Effect of homogenizing at different temperatures (1060, 1080, 1100, 1120, 1140, and 1160 ℃ for 1 h, water cooling) on the as-cast microstructure and precipitation phase dissolution of the GH4706 alloy was investigated using optical microscope(OM), scanning electron microscope(SEM), and time-of-flight secondary ion mass spectrometry (TOF-SIMS). The results indicate that there is severe dendritic segregation in the as-cast microstructure, with a large number of low melting point phases such as block shaped Laves phase, fine γ+γ′eutectic phase, and needle-like η phase. After homogenizing at 1060 ℃, the small γ+γ′ eutectic phase is eliminated. At 1100 ℃, the needle-like η phase is completely dissolved and the Laves phase is significantly dissolved. At 1140 ℃, only a very small amount of Laves phase is retains, but its partial initial melting occurs at 1160 ℃. Element segregation continues to improve as the homogenizing temperature increases below 1100 ℃. When the homogenizing temperature increases above 1100 ℃, the segregation coefficients of Nb and Ti rise again due to the dissolution of Laves phases.

Key words: GH4706 alloy, as-cast microstructure, elemental segregation, homogenizing

中图分类号:

TG156.21

侯翔益, 杨国涛, 王冲, 段然, 廉心桐, 黄烁. 均匀化处理对GH4706合金析出相回溶行为的影响[J]. 金属热处理, 2026, 51(2): 163-168.

Hou Xiangyi, Yang Guotao, Wang Chong, Duan Ran, Lian Xintong, Huang Shuo. Effect of homogenizing on dissolution behavior of precipitated phases of GH4706 alloy[J]. Heat Treatment of Metals, 2026, 51(2): 163-168.

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均匀化处理对GH4706合金析出相回溶行为的影响

Effect of homogenizing on dissolution behavior of precipitated phases of GH4706 alloy

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