Characterization of Prealloyed Ti–6Al–4V Powders from EIGA and PREP Process and Mechanical Properties of HIPed Powder Compacts
来源期刊：Acta Metallurgica Sinica2017年第8期
论文作者：Rui-Peng Guo Lei Xu Bernie Ya-Ping Zong Rui Yang
文章页码：735 - 744
摘 要：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（C4 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.
Rui-Peng Guo1,2，Lei Xu2，Bernie Ya-Ping Zong3，Rui Yang2
1. School of Materials Science and Engineering, Northeastern University2. Institute of Metal Research, Chinese Academy of Sciences3. Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education, Northeastern University
摘 要：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（C4 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.
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