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Influence of Processing Conditions on Microstructure and Mechanical Properties of Large Thin-Wall Centrifugal Ti–6Al–4V Casting.
- Source :
- Journal of Materials Science & Technology; Apr2016, Vol. 32 Issue 4, p362-371, 10p
- Publication Year :
- 2016
-
Abstract
- In this work, the effects of mould pre-heating temperatures and hot isostatic pressing (HIPping) process on the microstructural characteristics and mechanical properties, including static tensile and damage-tolerance properties of large thin-wall cylindrical Ti–6Al–4V casting, have been studied. The experimental results show that with the increasing mould pre-heating temperature from 673 to 873 K, the casting microstructures change from a mixture of Widmanstätten and colony microstructure to a primary colony. The centre of the thick wall section has relatively coarse microstructure than the edge and thin section. Lower mould pre-heating temperature brings about more porosities. HIPping process, which not only reduces the casting pores effectively but also increases the prior β grain boundary cohesion and coarsens the microstructure, is essential to improving the ductility of the casting. Due to the oxygen contamination and finer microstructure on the surface, micro-hardness profiles on the cross section present a decreasing tendency from the surface to inner. The thickness of the reaction layers for the different mould pre-heating temperatures is nearly the same (~450 µm). On the whole, the tensile strength and micro-hardness decrease with increasing mould pre-heating temperature from 673 to 873 K. However, the fracture toughness and fatigue crack growth resistance of the castings increase with increasing mould pre-heating temperature. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10050302
- Volume :
- 32
- Issue :
- 4
- Database :
- Supplemental Index
- Journal :
- Journal of Materials Science & Technology
- Publication Type :
- Periodical
- Accession number :
- 114090554
- Full Text :
- https://doi.org/10.1016/j.jmst.2015.12.010