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Title:Peak stress and dynamic softening constitutive model of titanium alloy TC18 during hot compression
Authors: Men Zhengxing  Zhou Jie  Zheng Jinhui  Ma Yaxin  Tang Yue 
Unit: Chengdu Aeronautic Polytechnic 
KeyWords: titanium alloy TC18  hot compression  peak stress  constitutive model  softening factor 
ClassificationCode:TG316
year,vol(issue):pagenumber:2018,43(6):129-133
Abstract:

In order to accurately predict the metal flow law during the hot die forging process of titanium alloy TC18, hot compression experiments with equal temperature and equal strain rate at temperature 868-908 ℃,strain rate 0.001-1 s-1 and maximum strain 0.7 were conducted by thermal simulation machine Gleeble-1500. The  stress-strain curves near the transformation point of material were obtained. Then, the Arrhenius peak stress constitutive model of TC18 was obtained by linear fitting method to analyze metal flow in macro and predict the maximum forming load during thermoplastic deformation process of TC18. The Fields-Backofen constitutive model of TC18 with addition of softening factor was obtained by multivariate nonlinear fitting method to analyze metal flow in micro during the thermoplastic deformation process. The results show that the predicted values of the Arrhenius peak stress model and the Fields-Backofen model are close to the experimental values within the range of experimental temperature and strain rate.

Funds:
国家自然科学基金面上项目(51275543) ;四川省教育厅科研资助项目 (172B0035)
AuthorIntro:
门正兴(1980-),男,博士,副教授;Email:amen1980@163.com
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