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【轻有色合金】BT25钛合金热变形过程临界损伤模型
发布时间:2020-09-15 文章来源:本站原创
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冯瑞1    王克鲁1    鲁世强1    李鑫1    程军2,3 钟明君1    周璇1

(1.南昌航空大学航空制造工程学院; 2.西北有色金属研究院陕西省医用金属材料重点实验室;

3.西北工业大学凝固技术国家重点实验室)

摘要:采用Gleeble 3500型热模拟试验机对BT25钛合金在变形温度为950~1 010 、应变速率为0.01~1 s-1、高度压下率为60%的条件下进行热压缩试验,结合标准Cockcroft Latham 理论,计算其临界损伤值。同时考虑变形温度和应变速率对最大损伤值的影响,引入Zener Hollomon 参数,建立了临界损伤模型。通过分析损伤敏感率曲线,以损伤敏感率为0.03作为裂纹产生的时机,并将该时刻的损伤值作为临界损伤因子。结果发现,BT25钛合金的临界损伤因子随变形温度和应变速率的改变而改变,变化范围为0.18~0.27。同时临界损伤因子对应变速率更为敏感,在恒定变形温度下,应变速率升高,其损伤因子减小。

关键词:BT25钛合金;热压缩;Zener Hollomon参数;临界损伤因子

中图分类号:TG146.23TP311   文献标志码    A

DOI:10.15980/j.tzzz.2020.06.024

 

Development of Critical Damage Model of BT25 Titanium Alloy during Hot Deformation

Feng Rui1, Wang Kelu1, Lu Shiqiang1, Li Xin1, Cheng Jun2,3, Zhong Mingjun1, Zhou Xuan1

(1.School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University; 2.Shaanxi Key Laboratory of Biomedical Metal MaterialsNorthwest Institute for Non-ferrous Metal Research; 3.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University)

Abstract:The hot compression behaviors of BT25 titanium alloys were investigated by Gleeble 3500 thermal simulator at the deformation temperature of 950~1 010 , strain rate of 0.01~1 s-1 and maximum height reduction of 60%. The critical damage values were calculated based on the standard Cockcroft Latham theory. Considering the influence of deformation temperature and deformation rate on the critical damage value, Zener Hollomon parameter was introduced to establish the critical damage model. By analyzing the damage sensitivity curves, the damage sensitivity rate of 0.03 is taken as the time when the crack is generated, and the damage value at that time is taken as the critical damage factor. The results reveal that the critical damage factor of BT25 titanium alloy is varied in the range of 0.18~0.27 with deformation temperature and strain rate. Meanwhile, the critical damage factor is more sensitive to the strain rate. At the same deformation temperature, the strain rate is increased and the damage factor is decreased.

Key Words: BT25 Titanium Alloy, Hot Compression, Zener Hollomon Parameter, Critical Damage Factor

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