<strong>GH2909</strong>低膨胀高温合金热处理中的组织演变行为

doi:10.11900/0412.1961.2021.00078

金属学报

2022, Vol. 58

Issue (9): 1179-1188 DOI: 10.11900/0412.1961.2021.00078

研究论文

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GH2909低膨胀高温合金热处理中的组织演变行为

李钊¹, 江河²(

), 王涛¹, 付书红¹, 张勇¹

^1.中国航发北京航空材料研究院先进高温结构材料重点实验室北京 100095
^2.北京科技大学材料科学与工程学院北京 100083

Microstructure Evolution of GH2909 Low Expansion Superalloy During Heat Treatment

LI Zhao¹, JIANG He²(

), WANG Tao¹, FU Shuhong¹, ZHANG Yong¹

^1.Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
^2.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

李钊, 江河, 王涛, 付书红, 张勇. GH2909低膨胀高温合金热处理中的组织演变行为[J]. 金属学报, 2022, 58(9): 1179-1188.
Zhao LI, He JIANG, Tao WANG, Shuhong FU, Yong ZHANG. Microstructure Evolution of GH2909 Low Expansion Superalloy During Heat Treatment[J]. Acta Metall Sin, 2022, 58(9): 1179-1188.

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摘要:

采用SEM、TEM、EPMA及萃取相分析等多种手段相结合对GH2909低膨胀高温合金在标准热处理过程中的组织演变规律进行分析。结果表明,锻态GH2909合金中主要析出相是块状和短棒状含Si的Laves相,Laves相在980℃固溶过程中逐渐发生部分回溶,两阶段固溶后短棒状Laves相基本消失。标准热处理后GH2909合金晶界上出现颗粒状的G相呈断续排列,晶内有盘片状ε相大量析出。基体中有细小的、以Ni和Ti为主要元素的γ′相,结构式为Ni_2.26Fe_0.16Co_0.50Nb_0.62Ti_0.43Al_0.02。GH2909合金中的Laves相、ε相、G相均为富Nb、富Si相,萃取相分析结果表明GH2909合金中30%左右的Si元素在标准热处理后以析出相形式存在,GH2909合金的组织控制中应关注Si元素的作用。

关键词 ： GH2909合金, 低膨胀高温合金, 热处理, 组织演变

Abstract：

GH2909 alloy is a low expansion superalloy developed on the base of GH2907 alloy. The mass fraction of Si is increased to accelerate the precipitation of ε phase, which improves resistance to stress-induced oxidative brittleness at grain boundaries. Increasing the mass fraction of Si also complicates the types of precipitates, and there is a long-time argument for determining precipitates in GH2909 alloy. The mechanical property is closely related to microstructure and precipitate. This work investigated the microstructure evolution of GH2909 low expansion superalloy during standard heat treatment by SEM, TEM, EPMA, and micro-chemical phase analysis. The Laves phase is the predominant phase in the wrought GH2909 alloy, according to the study. In the GH2909 alloy, the Si-rich Laves phase has a blocky form and a short rod shape. In solution treatment, the Laves phase dissolves gradually. After two-stage solution treatment, the short rod-shaped Laves phase almost completely dissolves. Slow cooling is needed to avoid re-precipitation of short rod shape Laves phase during solution treatment because Laves phase is sensitive to the cooling rate. Discontinuous G phase particles decorate grain boundaries after normal heat treatment, and a sizable discal phase precipitates in the matrix. There is also a fine phase rich in Ni and Ti in the matrix with the chemical formula Ni_2.26Fe_0.16Co_0.50Nb_0.62Ti_0.43Al_0.02. In the GH2909 alloy, the Laves phase, G phase, and ε phase are high in Si and Nb. During precipitation, these phases compete for Si and Nb elements. Furthermore, the micro-chemical phase analysis results demonstrate that 30% of the Si in the GH2909 alloy is finally precipitated. As a result, Si should be given special consideration in the microstructure control of the GH2909 alloy.

Key words： GH2909 alloy low expansion superalloy heat treatment microstructure evolution

收稿日期: 2021-02-25

ZTFLH:

TG 146.1

基金资助:国家自然科学基金项目(51701011);中央高校基本科研业务费项目(FRF-TP-19-038A2);重点实验室基金一般项目(6142903180205)

作者简介: 李钊,男,1985年生,高级工程师,硕士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00078 或 https://www.ams.org.cn/CN/Y2022/V58/I9/1179

表1 实验用GH2909合金热处理工艺

图1 GH2909合金JMatPro计算结果

图2 GH2909合金锻态组织特征

图3 锻态GH2909合金中Laves相的TEM像及选区电子衍射(SAED)花样

图4 锻态GH2909合金中Laves相元素分布的EPMA结果

图5 固溶处理对GH2909合金组织的影响

图6 标准热处理态(T4) GH2909合金显微组织的SEM像

图7 标准热处理态GH2909合金(T4)晶界上G相的TEM像和SAED花样

图8 标准热处理态GH2909合金(T4)析出相元素分布的EPMA结果

图9 标准热处理态GH2909合金(T4)中γ′相的TEM像

图10 标准热处理态GH2909合金(T4)中ε相TEM像及EDS分析

图11 标准热处理态GH2909合金(T4)中ε相的不均匀分布情况

图12 GH2909合金热处理不同阶段萃取相分析结果

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