GH2909高温合金Nb元素偏析行为及均匀化规律

doi:10.13251/j.issn.0254-6051.2025.02.033

金属热处理 ›› 2025, Vol. 50 ›› Issue (2): 212-217.DOI: 10.13251/j.issn.0254-6051.2025.02.033

GH2909高温合金Nb元素偏析行为及均匀化规律

戚慧琳, 郭续龙, 陈琦, 周扬

成都先进金属材料产业技术研究院特钢技术研究所, 四川成都 610303

收稿日期:2024-08-12 修回日期:2024-12-18 发布日期:2025-04-10
通讯作者: 周扬,教授级高级工程师,博士,E-mail:yangzhou_hit@126.com
作者简介:戚慧琳(1996—),女,工程师,硕士,主要研究方向为高温合金,E-mail:11849156@mail.sustech.edu.cn。

Nb element segregation behavior and homogenization law of GH2909 superalloy

Qi Huilin, Guo Xulong, Chen Qi, Zhou Yang

Department of Special Steel Technology, Chengdu Advanced Metal Materials Industrial Technology Institute, Chengdu Sichuan 610303, China

Received:2024-08-12 Revised:2024-12-18 Published:2025-04-10

摘要/Abstract

摘要： 通过JMatPro计算了GH2909合金的理论均匀化工艺,采取1130~1190 ℃热处理对铸态合金进行均匀化试验验证。利用光学显微镜、扫描电镜、电子探针表征铸态及均匀化后的GH2909合金微观组织、元素偏析和Laves相回溶情况。对均匀化后的GH2909合金进行845 ℃×4 h空冷处理,观察针状η相的分布情况,评估GH2909合金均匀化效果。结果表明,铸态GH2909合金中存在大量低熔点Laves相,Nb元素偏析最为严重。经过1150 ℃×7 h或1130 ℃×10 h均匀化后,GH2909合金中Laves相完全回溶。Laves相回溶后,经过1190 ℃×35 h均匀化,Nb元素偏析系数降低至1.046,残余偏析系数为0.059。对均匀化后的试样进行845 ℃×4 h空冷处理后,随着Nb元素逐渐扩散均匀,富Nb的针状η相在晶内、晶界大量析出。结合偏析系数和η相析出情况,1150 ℃×7 h+1190 ℃×35 h均匀化可实现GH2909合金的完全均匀化。

关键词: GH2909高温合金, 均匀化, Laves相, Nb, 元素偏析

Abstract: Theoretical homogenization process of GH2909 alloy was calculated via JMatPro and homogenization experimental verification was conducted for the as-cast alloy at 1130 ℃ to 1190 ℃. Microstructure, element segregation and dissolution of Laves phase of the as-cast and homogenized GH2909 alloy were characterized by means of metallurgical microscope, scanning electron microscope and electronic probe. After heat treatment at 845 ℃ for 4 h and then air cooling for the homogenized GH2909 alloy, the distribution of needle-like η phase was observed, in order to evaluate homogenization effect of the GH2909 alloy. The results show that a mass of low melting point Laves phase exists in the as-cast GH2909 alloy and Nb element is the most important segregation element. Laves phase dissolves completely in the GH2909 alloy after 1150 ℃×7 h or 1130 ℃×10 h homogenization treatment. After complete Laves phase dissolution, 1190 ℃×35 h homogenization treatment decreases segregation coefficient to 1.046 and residual segregation coefficient to 0.059 of Nb element. After heat treatment at 845 ℃ for 4 h and air cooling for homogenized specimens, Nb-rich needle-like η phase precipitates along grain boundary and in grain with uniform diffusion of Nb element. Combining segregation coefficient with η phase precipitation behavior, 1150 ℃×7 h+1190 ℃×35 h homogenization treatment can realize complete homogenization of the GH2909 alloy.

Key words: GH2909 superalloy, homogenization, Laves phase, Nb, element segregation

中图分类号:

TG156.21

戚慧琳, 郭续龙, 陈琦, 周扬. GH2909高温合金Nb元素偏析行为及均匀化规律[J]. 金属热处理, 2025, 50(2): 212-217.

Qi Huilin, Guo Xulong, Chen Qi, Zhou Yang. Nb element segregation behavior and homogenization law of GH2909 superalloy[J]. Heat Treatment of Metals, 2025, 50(2): 212-217.

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GH2909高温合金Nb元素偏析行为及均匀化规律

Nb element segregation behavior and homogenization law of GH2909 superalloy

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