Characterization of Prealloyed Ti-6Al-4V Powders from EIGA and PREP Process and Mechanical Properties of HIPed Powder Compacts

• Published in: Acta metallurgica sinica : English letters Vol. 30; no. 8; pp. 735 - 744
• Main Authors: Guo, Rui-Peng, Xu, Lei, Zong, Bernie Ya-Ping, Yang, Rui
• Format: Journal Article
• Language: English
• Published: Beijing The Chinese Society for Metals 01.08.2017; Springer Nature B.V
• Subjects: Atomizing; Characterization and Evaluation of Materials; Chemistry and Materials Science; Comparative studies; Cooling; Corrosion and Coatings; Electrodes; Gas atomization; Heat treatment; Hot isostatic pressing; Induction melting; Materials fatigue; Materials Science; Mechanical properties; Metal fatigue; Metallic Materials; Microstructure; Morphology; Nanotechnology; Organometallic Chemistry; Particle size; Particle size distribution; Porosity; Powder compacts; Powder metallurgy; Rotating plasmas; Software; Spectroscopy/Spectrometry; Tap density; Titanium alloys; Titanium base alloys; Tomography; Transgranular fracture; Tribology; Ti–6Al–4V; Near-net shape forming; Prealloyed powder; Hot isostatic pressing
• ISSN: 1006-7191; 2194-1289
• DOI: 10.1007/s40195-017-0540-4

Prealloyed Ti-6Al-4V powders were prepared by electrode induction melting gas atomization （EIGA） and plasma rotating electrode process （PREP） in this work. A comparative study of EIGA and PREP powders for hot isostatic pressing （HIPing） compaction was conducted. Characterization of important technological parameters such as particle size distribution, powder surface morphology and flowability was carried out. Microstructure and mechanical properties of Ti- 6Al-4V powder compacts HIPed from EIGA and PREP powders were also investigated. The results showed that the EIGA powder has a finer average particle size and higher tap density, while the PREP powder has better flowability and less pores. Micropores can be observed in heat-treated EIGA powder compacts by X-ray tomography and the porosity was found to be about 0.02%. There are no micropores （≥4 μm） to be detected in heat-treated PREP powder compacts. Transgranular fracture mode as well as micropores contributes to the scatter in fatigue property of heat-treated PREP powder compacts. The respective advantages and disadvantages of both EIGA and PREP powders for producing Ti-based complex parts through HIPing were also discussed.