碳化物特征对<strong>GH3536</strong>合金冷变形损伤的影响及控制

doi:10.11900/0412.1961.2022.00094

金属学报

2024, Vol. 60

Issue (4): 464-472 DOI: 10.11900/0412.1961.2022.00094

研究论文

本期目录 | 过刊浏览

碳化物特征对GH3536合金冷变形损伤的影响及控制

余华, 李昕, 江河(

), 姚志浩, 董建新

北京科技大学材料科学与工程学院北京 100083

Effect of Carbide Characteristics on Damage of Cold Deformed GH3536 Alloy and Its Control

YU Hua, LI Xin, JIANG He(

), YAO Zhihao, DONG Jianxin

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

余华, 李昕, 江河, 姚志浩, 董建新. 碳化物特征对GH3536合金冷变形损伤的影响及控制[J]. 金属学报, 2024, 60(4): 464-472.
Hua YU, Xin LI, He JIANG, Zhihao YAO, Jianxin DONG. Effect of Carbide Characteristics on Damage of Cold Deformed GH3536 Alloy and Its Control[J]. Acta Metall Sin, 2024, 60(4): 464-472.

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摘要:

为了研究碳化物对GH3536合金冷变形损伤的影响并加以控制，通过薄带材的冷轧变形和圆柱试样的压缩变形，观察了碳化物破裂以及基体局部开裂的现象，并结合有限元模拟结果，进一步探讨了碳化物形貌与分布特征对组织损伤的影响。结果表明，当碳化物尺寸较大、形状不规则且呈团聚分布时，其内部应力与破裂倾向较大，而小尺寸圆形碳化物的情况与之相反。碳化物的团聚与条带状分布是引起基体应力和开裂倾向增加的主要原因。热处理结果表明，通过将热处理温度提高到1150℃以上，可以明显改善小尺寸碳化物的团聚和条带状分布特征，但对于10 μm以上的大尺寸碳化物改善效果不明显。

关键词 ： GH3536合金, 冷变形, 热处理, 碳化物破裂

Abstract：

GH3536 alloy is a solid solution-strengthened superalloy for aero-engines. In general, this alloy is cold rolled into thin strips and used in honeycomb structures in engine sealing systems. During cold deformation of GH3536 alloy, a microstructural damage caused by carbide particles is the focus of attention. Therefore, understanding the influence of carbides on the cold deformation damage of GH3536 alloy is necessary to control such a phenomenon. Carbide cracking and local cracking of the matrix was observed through cold rolling deformation of thin strips and compression deformation of cylindrical specimens. Combined with finite element simulation results, the effect of carbide morphology and distribution characteristics on the microstructural damage was further discussed. Results show that when carbides are larger in size, irregular in shape, and distributed in agglomeration, the internal stress and fracture tendency are larger, which is contrary to small circular carbides. The agglomeration and banded distribution of carbides primarily increase matrix stress and cracking tendency. The heat treatment results show that the agglomeration and banded distribution characteristics of small carbides can be significantly improved by increasing the solution/annealing heat treatment temperature above 1150^oC, but the effect is not evident for large carbides above 10 μm.

Key words： GH3536 alloy cold deformation heat treatment carbide fracture

收稿日期: 2022-03-07

ZTFLH:

TG132.3

基金资助:国家自然科学基金项目(92160201)

通讯作者: 江河，jianghe@ustb.edu.cn，主要从事变形高温合金研究

Corresponding author: JIANG He, associate professor, Tel: 13811910685, E-mail: jianghe@ustb.edu.cn

作者简介: 余华，女，1996年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00094 或 https://www.ams.org.cn/CN/Y2024/V60/I4/464

图1 SEM照片获取GH3536合金碳化物特征并建立有限元模型

图2 GH3536锻态合金的碳化物SEM像

图3 GH3536合金带材冷轧变形50%至约0.078 mm厚度的碳化物破裂

图4 GH3536合金经1180℃、30 min固溶热处理的室温压缩变形55.6%的碳化物破裂

图5 GH3536合金30%变形量的圆形碳化物及形状不规则碳化物的最大主应力分布

图6 30%变形量的GH3536合金中条带状分布碳化物的最大主应力分布

图7 GH3536合金30%变形量的碳化物周围基体应力/应变分布

图8 GH3536合金碳化物随热处理温度的变化

图9 GH3536合金碳化物面积分数随热处理温度的变化曲线

图10 GH3536合金碳化物的最小外接矩形尺寸随热处理温度的变化

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