The effect of HIPping pressure on phase transformations in Ti-5Al-5Mo-5V-3Cr

Hot-isostatic-pressing (HIPping) of pre-alloyed powders is an effective, highly material-efficient, novel manufacturing technique for the preparation of near-to-net shape components. However, the effect of pressure during HIPping on the beta arrow right alpha transformation inherent in titanium allo...

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Veröffentlicht in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-03, Vol.598, p.207-216
Hauptverfasser:	LINGFEI CAO, XIAODONG WU, SUMING ZHU, JUNFA MEI, XINHUA WU, BETTLES, Colleen
Format:	Artikel
Sprache:	eng
Schlagworte:	Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder Cross-disciplinary physics: materials science rheology Diffraction Exact sciences and technology Materials science Microstructure Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Phase relationships Phase transformations Physics Titanium Titanium base alloys Transformations X-rays
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Zusammenfassung:	Hot-isostatic-pressing (HIPping) of pre-alloyed powders is an effective, highly material-efficient, novel manufacturing technique for the preparation of near-to-net shape components. However, the effect of pressure during HIPping on the beta arrow right alpha transformation inherent in titanium alloys is not well understood. This effect on phase transformation was investigated on both powder-based and bulk-based Ti-5Al-5Mo-5V-3Cr (Ti-5553). Microstructure characterisation and phase relationships were investigated using scanning electron microscopy and X-ray diffraction methods. The results show that the modest pressure applied in HIPping (100-200MPa) can influence the alpha - beta phase transformation in Ti-5553. Possible mechanisms related to these changes in phase transformation and microstructure are discussed.
ISSN:	0921-5093 1873-4936
DOI:	10.1016/j.msea.2014.01.013