固溶处理对一种低偏析高温合金组织的影响

doi:10.11901/1005.3093.2022.289

材料研究学报

2023, Vol. 37

Issue (8): 603-613 DOI: 10.11901/1005.3093.2022.289

研究论文

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固溶处理对一种低偏析高温合金组织的影响

熊诗琪¹^,², 刘恩泽¹(

), 谭政¹, 宁礼奎¹, 佟健¹, 郑志¹, 李海英¹

^1.中国科学院金属研究所沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016

Effect of Solution Heat Treatment on Microstructure of DZ125L Superalloy with Low Segregation

XIONG Shiqi¹^,², LIU Enze¹(

), TAN Zheng¹, NING Likui¹, TONG Jian¹, ZHENG Zhi¹, LI Haiying¹

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

引用本文:

熊诗琪, 刘恩泽, 谭政, 宁礼奎, 佟健, 郑志, 李海英. 固溶处理对一种低偏析高温合金组织的影响[J]. 材料研究学报, 2023, 37(8): 603-613.
Shiqi XIONG, Enze LIU, Zheng TAN, Likui NING, Jian TONG, Zhi ZHENG, Haiying LI. Effect of Solution Heat Treatment on Microstructure of DZ125L Superalloy with Low Segregation[J]. Chinese Journal of Materials Research, 2023, 37(8): 603-613.

全文: PDF(20187 KB) HTML

摘要:

采用光学显微镜(OM)、扫描电镜(SEM)和电子探针(EPMA)等手段研究了DZ125L合金在固溶处理过程中组织的演变。结果表明：在固溶过程中，MC碳化物的形态由草书状转变为颗粒状或短棒状；枝晶干γ'相的溶解速率比枝晶间的高；在1240℃和1250℃固溶时，随着保温时间的延长γ'和γ/γ'共晶相的面积分数减小而枝晶间的γ'相平均尺寸增大；而在1230℃固溶时，γ'、γ/γ'共晶相的面积分数以及枝晶间γ'相的平均尺寸按照先减小、后增大、再减小规律变化。在1230℃固溶过程中出现的γ'和γ/γ'共晶相面积分数反常增大，是枝晶干γ'相的快速溶解使枝晶干Ta元素通过γ基体扩散到枝晶间所致。

关键词 ：金属材料, DZ125L合金, 固溶处理, 微观组织, γ'相, γ/γ'共晶

Abstract：

The microstructural evolution of DZ125L superalloy during solution heat treatment in the range of 1230℃ to 1260℃ was investigated by optical microscope (OM), scanning electron microscope (SEM) and electron probe microanalyser (EPMA). The results show that during solution heat treatment, MC carbide transformed from cursive-script like to granular or short rod like, and the dissolution of γ′ phase in the dendritic core was faster than that in the interdendritic region. The area fraction of γ′ phase and γ/γ′ eutectic decreased, and the average size of γ′ phase in the interdendritic region increased with the increase of heating time at 1240℃ and 1250℃, while the area fraction of γ′ phase and γ/γ′ eutectic, and the average size of γ′ phase in the interdendritic region decreased firstly, then increased, and decrease lastly at 1230℃. The abnormal increase of area fraction of γ′ phase and γ/γ′ eutectic during solution heat treatment at 1230℃ was caused by the rapid dissolution of γ′ phase in the dendritic core, which led to the diffusion of Ta from dendrite core to interdendritic region through γ matrix.

Key words： metallic materials DZ125L superalloy solution heat treatment microstructure γ′ phase γ/γ′ eutectic

收稿日期: 2022-05-23

ZTFLH:

TG142

通讯作者: 刘恩泽，研究员，nzliu@imr.ac.cn，研究方向为高温合金

Corresponding author: LIU Enze, Tel: (024)23971143, E-mail: nzliu@imr.ac.cn

作者简介: 熊诗琪，女，1998年生，硕士生

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表1 DZ125L母合金的成分

图1 铸态DZ125L合金的微观组织

表2 铸态样品γ/γ'共晶和碳化物的成分

图2 DZ125L合金的DSC加热曲线

图3 DZ125L合金在不同温度下的初熔组织

图4 固溶处理后碳化物的形貌

图5 在不同条件下固溶处理后合金的微观组织

图6 在不同条件下固溶处理后γ'相的面积分数和γp'相平均尺寸

图7 在不同条件下固溶处理后γ'相的尺寸分布

图8 固溶处理后γ'相的形貌

图9 固溶处理后γ/γ'共晶形貌

图10 在不同条件下固溶处理后γ/γ'共晶的面积分数

图11 Ti和Ta的均匀化动力学曲线

图12 在1230℃ γ基体中Ta元素的偏析系数与时间的关系

图13 在1230℃固溶处理后枝晶间γ'和γ/γ'共晶相数量反常增加的机制示意图

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