<strong>GH4065A</strong>合金铸态的组织和元素偏析及其均匀化

doi:10.11901/1005.3093.2024.511

材料研究学报

2026, Vol. 40

Issue (1): 59-71 DOI: 10.11901/1005.3093.2024.511

研究论文

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GH4065A合金铸态的组织和元素偏析及其均匀化

赵书伟¹, 孙文儒², 吕文龙², 张伟红², 邱克强¹(

)

^1.沈阳工业大学材料科学与工程学院沈阳 110870
^2.中国科学院金属研究所沈阳 110016

Elements Segregation and Microstructure Homogenization of Cast GH4065A Superalloy

ZHAO Shuwei¹, SUN Wenru², LV Wenlong², ZHANG Weihong², QIU Keqiang¹(

)

^1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

赵书伟, 孙文儒, 吕文龙, 张伟红, 邱克强. GH4065A合金铸态的组织和元素偏析及其均匀化[J]. 材料研究学报, 2026, 40(1): 59-71.
Shuwei ZHAO, Wenru SUN, Wenlong LV, Weihong ZHANG, Keqiang QIU. Elements Segregation and Microstructure Homogenization of Cast GH4065A Superalloy[J]. Chinese Journal of Materials Research, 2026, 40(1): 59-71.

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摘要:

研究了GH4065A高温合金的铸态组织、元素偏析、合金相的初熔温度以及均匀化处理对其组织的影响。结果表明，在铸态合金的γ枝晶间析出了γ+γ′共晶、硼化物和TiN等相，还发现η-Ni₃(Ti,Nb)和Ni₅Zr相。用金相水淬法测定了其中各相的初熔温度和凝固顺序。用EDS点分析法测定了合金中不同元素的偏析系数，发现Nb、Ti、Mo和W元素严重偏析。制定的三阶段热处理制度降低了元素的偏析系数，使其残余偏析指数降低到小于1.2。

关键词 ：金属材料, GH4065A合金, 铸态组织, 凝固偏析, 均匀化

Abstract：

The microstructure, elemental segregation characteristics, incipient melting temperatures of constituent phases, and homogenization mechanisms of the cast GH4065A superalloy were studied via OM, SEM with EDS, EPMA and TEM etc. Microstructural characterization reveals that the precipitation of γ+γ′ eutectics, borides, and TiN phases within γ interdendritic regions, with the newly identified η-Ni₃(Ti,Nb) and Ni₅Zr intermetallic phases were observed in the cast alloy. The phase formation sequence and the incipient melting temperatures of constituent phases was determined through metallographic analysis combined with water quenching techniques. Quantitative assessment of elemental segregation via EDS point analysis revealed that Nb, Ti, Mo, and W exhibited pronounced segregation tendencies. To address this microstructural heterogeneity, a three-stage homogenization heat treatment procedure was developed, thereby the residual segregation indices of all critical elements were all reduced below 1.2. The efficacy of this optimized thermal processing route was experimentally validated, providing crucial technical references for the industrial application of GH4065A alloy components.

Key words： metallic materials GH4065A alloy As-cast microstructure solidification segregation homogenization

收稿日期: 2024-12-27

ZTFLH:

TG132.3

通讯作者: 邱克强，教授，kqqiu@sut.edu.cn，研究方向为非晶合金、镁合金、高温合金及复合材料

Corresponding author: QIU Keqiang, Tel: 18904048801, E-mail: kqqiu@sut.edu.cn

作者简介: 赵书伟，男，1995年生，硕士生

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图1 GH4065A合金的热力学相图及其局部放大

图2 铸态GH4065A合金枝晶间析出相的扫描电镜背散射形貌和D处的局部放大图

表1 EDS测出的枝晶间析出相的化学成分

图3 η-Ni3Ti相在高分辨透射电镜下面扫结果

图4 Ni5Zr和硼化物相在高分辨透射电镜下面扫结果

图5 GH4065A合金的宏观枝晶组织、边缘处、R/2处和芯部处枝晶的形貌

图6 铸态GH4065A合金枝晶间的元素分布

表2 GH4065A合金芯部等轴晶处的成分分布及各个元素的分配系数

图7 GH4065A合金的铸态以及在1120 ℃和1130 ℃保温1 h后水淬的组织和相的EDS谱

图8 GH4065A合金在1170 ℃和1180 ℃保温1 h后的组织形貌

图9 GH4065A合金在1190 ℃保温1 h后的组织形貌和EDS谱

图10 铸态GH4065A合金在不同温度保温1 min水淬后共晶γ+γ′形貌的演变

图11 GH4065A合金在1110 ℃保温不同时间后的组织形貌

图12 GH4065A合金在1160 ℃保温不同时间后的组织形貌

图13 GH4065A合金在不同温度保温1 h后和两阶段均匀化制度处理后的金相形貌

表3 合金经不同热处理后的残余偏析系数δ值

图14 GH4065A合金铸态组织经不同制度热处理后的演化

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