Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 654, Issue -, Pages 418-425Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.12.058
Keywords
Titanium alloys; Powder metallurgy; Hot deformation; Fatigue; Microtexture; EBSD
Categories
Funding
- National Key Fundamental Research and Development Project of China [2014CB644002]
- National Natural Science Foundation of China [51301203]
- National Science Foundation for Post-doctoral Scientists of China [2014M551827]
- Project of Innovation-driven Plan in Central South University of China [2015CX004]
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The fatigue characteristics of powder metallurgy (P/M) Ti6Al4V (wt%) alloys prepared by powder sintering and hot rolling were studied under tension-tension loading conditions at R=0.1 and 25 Hz in air, where R=sigma(min)/sigma(max) (sigma(min) and sigma(max) are the applied minimum and maximum stresses, respectively). The results show that for the as-sintered Ti6Al4V alloy the fatigue limit is about 325 MPa, and the fatigue cracks initiate from the residual pores open to the surface of the gauge area and propagate along the alpha/beta interfaces. Hot rolling markedly enhances the fatigue properties, and the fatigue limit increases to about 430 MPa. The reducing of porosity and refining of grain size through hot rolling are the dominant mechanisms for the improvement of fatigue properties. In addition, the microstructure of alpha/beta interfaces//RD and the texture of < 0001 > alpha//RD formed during hot rolling act as barriers for the fatigue crack propagation, which partly attributes to the improvement of the fatigue properties. (C) 2015 Elsevier B.V. All rights reserved.
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