今天是 管理员登录 | 旧版入口
   机电工程学院    交流合作 >学术活动

学术报告

时间:20161118日下午3:00-4:30
地点:工学2号馆730会议室
报告题目:Powder Metallurgy Ti-6Al-4V Alloy with Wrought-like Microstructure and Mechanical Properties by Hydrogen Sintering
  主讲人:房志刚
  主讲人介绍:现任美国犹他大学冶金工程系教授,并担任国际知名的硬质合金及超硬材料期刊International Journal of Refractory Metals and Hard Materials主编。之前房志刚教授曾担任多家世界顶级硬质合金及超硬材料公司研发部门主管。是世界知名的硬质合金及超硬材料学术权威和顶级专家。房志刚教授的研究领域包括硬质合金、金刚石聚晶、粉末冶金材料的合成技术及力学性能研究,房教授还在诸如金属基复合材料、耐磨材料及涂层、纳米材料合成工艺研究方面进行了深入广泛的研究。自2002年至今,房教授已经在纳米粉末合成,纳米材料烧结工艺,硬质合金梯度材料,粉末冶金钛合金,金属间化合物涂层,储氢材料等方面取得举世瞩目的研究成果。房志刚教授已经发表120余篇专业论文,拥有30多项美国专利。

 

Powder Metallurgy Ti-6Al-4V Alloy with Wrought-like Microstructure and Mechanical Properties by Hydrogen Sintering

Z. Zak Fang, Pei Sun, James Paramore, Mark Koopman, and Ravi Chandran

The Department of Metallurgical Engineering, The University of Utah, zak.fang@utah.edu

 

Keywords: Titanium; Powder metallurgy; Sintering; Hydrogen; Ultrafine grained microstructure

Abstract

Titanium powder is typically sintered in high vacuum to achieve high density and low oxygen. Sintered materials usually have coarse grain size and lamellar structure in the case of sintered Ti-6Al-4V alloys. In this work, a novel process is designed to take advantage of both the higher sintered density under hydrogen and the phase transformation induced by hydrogen that produces fine grain sizes. The process can produce near-fully dense (>99%CP-Ti, >98%Ti-6Al-4V) Ti materials with very fine grain size (~<1.0µm) in as-sintered state. The refined microstructure has advantages over coarse lamellar structure of conventional sintered Ti materials from the stand point of mechanical properties. The as-sintered Ti-6Al-4V can also be heat treated to obtain wrought-like microstructure and mechanical properties. This presents a new opportunity for low cost manufacturing of PM Ti materials with both static and fatigue mechanical properties equivalent to that of wrought Ti materials. This presentation will show the results of microstructure and mechanical properties of as-sintered, heat treated, and those with an additional gaseous-isostatic-forging (GIF) processing. The results demonstrate that PM Ti-6Al-4V can be made to have equivalent mechancial, including fatigue, properties to that of wrought Ti. This technology will have impact on not only the press-sintered Ti, but also that of PM Ti made by injection molding techniques.

 

[点击数:699 更新时间:2016-11-16 文章录入:lrx_01]