Study on the Evolution of Damage Degradation at Different Temperatures and Strain Rates for Ti-6Al-4V Alloy

Author:

Gao Lin12,Zhao Jiang1,Quan Guo-zheng13,Xiong Wei4,An Chao1

Affiliation:

1. State Key Laboratory of Mechanical Transmission, School of Material Science and Engineering , Chongqing University , Chongqing 400044 , China

2. China National Erzhong Group Co. Deyang Sichuan 618013 , China

3. State Key Laboratory of Materials Processing and Die & Mould Technology , Huazhong University of Science and Technology , Hubei 430074 , China

4. Institute of Nuclear and New Energy Technology of Tsinghua University , Bei Jing , China

Abstract

Abstract It is a significant issue to deeply understand the nature relationships between damage degradation and deforming parameters, and then identify the changes of initial ductile fracture time with processing parameters and further adjusting the forming processes for obtaining the fracture-free components. For Ti-6Al-4V alloy, the strain-stress data in the temperature range of 1023–1323 K and strain rate range of 0.01–10 s−1 were obtained by compression tests. The finite element model with stress-strain data was constructed to simulate the ductile damage cumulating processes under different conditions and obtained the maximum damage values. Subsequently, the ductile fracture criterion (DFC) of Ti-6Al-4V alloy was established and the effects of temperature and strain rate on DFC were discussed. The results show that the variation range of DFC under different deformation conditions is 0.07–0.15. Subsequently, the deformation conditions with higher fracture risk were identified as 1200∼1275 K & 1∼10 s−1 and verified with the experiment observations.

Publisher

Walter de Gruyter GmbH

Subject

Physical and Theoretical Chemistry,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference24 articles.

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