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材料导报  2026, Vol. 40 Issue (8): 25030031-10    https://doi.org/10.11896/cldb.25030031
  金属与金属基复合材料 |
基于GTN模型的GH4698合金高温损伤演化研究
高静, 陈小敏*
长沙理工大学机械与运载工程学院,长沙 410114
The High-temperature Damage Evolution Study of GH4698 Alloy Based on the GTN Model
GAO Jing, CHEN Xiaomin*
College of Mechanical and Vehicle Engineering, Changsha University of Science and Technology, Changsha 410114, China
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摘要 以GH4698合金作为研究对象,在1 000～1 150 ℃,应变速率0.001～0.01 s-1条件下开展高温拉伸实验,系统地研究了变形工艺参数对合金流变应力的影响规律。即:在恒定变形温度条件下,流变应力与应变速率正相关;而当应变速率恒定时,流变应力变形温度负相关。对断口剖面的微观组织的分析表明,变形工艺参数对GH4698合金的微观结构演变有显著影响。随着温度的升高和应变速率的降低,断口剖面处的动态再结晶晶粒的体积分数增加,同时,断口处孔洞的数量和体积分数有所增大。本工作建立了GH4698合金的Gurson-Tvergaard-Nedleman(GTN)模型,并利用所构建的GTN损伤模型对圆棒试样的高温拉伸断裂失效过程进行了预测,结果表明,预测的真应力-真应变结果与实验曲线吻合良好,相关系数可达0.997 6。
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高静
陈小敏
关键词:  GH4698合金  高温拉伸损伤  GTN模型    
Abstract: The hot tensile behavior of GH4698 alloy was investigated within the temperature range of 1 000—1 150 ℃ and at strain rates between 0.001 and 0.01 s-1. The influence of deformation process parameters on the flow stress was systematically examined. The results indicate that the flow stress exhibits a positive correlation with strain rate under constant deformation temperature, whereas it decreases with increasing temperature under a fixed strain rate. Furthermore, fractographic analysis reveals that the deformation parameters significantly affect the microstructural evolution of the GH4698 alloy. As the temperature increases and the strain rate decreases, the volume fraction of dynamically recrystallized (DRX) grains at the fracture surface increases. Simultaneously, both the number and volume fraction of voids at the fracture site are also eleva-ted. To characterize the high-temperature tensile fracture behavior, a Gurson-Tvergaard-Needleman (GTN) damage model was established. A strong correlation between the experimental and predicted true stress-strain curves demonstrate the high predictive accuracy of the developed GTN model for the investigated superalloy.
Key words:  GH4698 alloy    high temperature tensile damage    GTN model
出版日期:  2026-04-25      发布日期:  2026-05-06
ZTFLH:  TG146.1+5  
基金资助: 国家自然科学基金(52475148)
通讯作者:  * 陈小敏,博士,副教授,硕士研究生导师,从事金属零件高性能制造成形工艺与装备技术方面的研究。chenxm0616@csust.edu.cn   
作者简介:  高静,长沙理工大学机械与运载工程学院硕士研究生,在陈小敏副教授的指导下进行研究。目前主要从事镍基高温合金的断裂机理方面的研究。
引用本文:    
高静, 陈小敏. 基于GTN模型的GH4698合金高温损伤演化研究[J]. 材料导报, 2026, 40(8): 25030031-10.
GAO Jing, CHEN Xiaomin. The High-temperature Damage Evolution Study of GH4698 Alloy Based on the GTN Model. Materials Reports, 2026, 40(8): 25030031-10.
链接本文:  
https://www.mater-rep.com/CN/10.11896/cldb.25030031  或          https://www.mater-rep.com/CN/Y2026/V40/I8/25030031
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