学术报告
应PP电子游戏网站冶金物理化学研究所耿树江教授邀请，美国西弗吉尼亚大学机械与航天工程系刘兴博教授来我校进行学术交流和访问。在校期间，刘兴博教授将为我校广大师生作有关先进超超临界电厂用镍基合金方面的报告。欢迎感兴趣的老师和同学参加。
报告安排如下：
报告题目：Ni-Base Superalloys for Advanced-Ultrasupercritical (A-USC) Power Plants
主讲人：刘兴博教授, West Virginia University, USA
时间：2017年06月19日周一上午9：00
地点：知行楼634室
专家简介：
Prof.Xingbo Liu graduated from University of Science and Technology Beijing in 1999, and he subsequently went to West Virginia University as a postdoc. Currently, he is the Professor and Associate Chair for Research in Mechanical & Aerospace Engineering Department at WVU. Prof. Liu’s main research interests are advanced high temperature materials for next generation energy conversion and storage. His research focuses are Ni-base superalloys and solid oxide fuel cells. Prof. Liu has received numerous awards including R&D 100 Award (2011), TMS Early Career Faculty Fellow Award (2010), TMS Brimacombe Medallist (2016), WV Innovator of the Year (2013), WVU CEMR Researcher of the Year (2015, 2011), Outstanding Researcher Awards (2015, 2011, 2009, 2008), and others. In 2015, Prof. Liu was elected as the Fellow of ASM International.
Ni-Base Superalloys for Advanced-Ultrasupercritical (A-USC) Power Plants
先进超超临界电厂用镍基高温合金
Xingbo Liu (刘兴博)
Department of Mechanical and Aerospace Engineering,
West Virginia University, WV26506
USA
Abstract:
The development of next generation Advanced Ultrasupercritical (A-USC) Coal-fired Power plants provide several grant challenges on Ni-base superalloys in terms of mechanical properties, microstructural stabilities, processing, and corrosion resistance and monitoring. Inconel 740 has gained much attention recently as a candidate material for use as tubing in USC power plant applications, but its microstructural stability at USC temperatures has been shown to be an issue through observations of gamma prime coagulation, transformation of gamma prime to eta phase, and also through the formation of G-phase. We evaluate the effect of nominal Al content on the microstructural stability of wrought IN 740 at USC temperatures for times up to 2000 hours. We also provide a comparison of the microstructural stability of both wrought and cast versions of IN 740 evaluated under these conditions. Freckle is a primary defect formed during the re-melting of superalloy ingots. We have developed an improved freckle criterion that preserves the anisotropic nature of the permeability tensor throughout the derivation and provides improved resolution on freckle prediction. A clear separation between the freckled and non-freckled experiments was obtained for all compositions. The effect of the tilted solidification front over the freckling potential was corroborated, and the results suggested that the directionality of permeability affects the location within the mush layer of the potential nucleation sites for the channels leading to freckles. The final part of this presentation will be devoted to our current work on developing electrochemical sensor for in-situ monitoring of coal-ash hot corrosion of Ni-base superalloys as USC boiler tubes, which is based on our patented technology.
Bio: Dr. Xingbo Liu graduated from University of Science and Technology Beijing in 1999, and he subsequently went to West Virginia University as a postdoc. Currently, he is the Professor and Associate Chair for Research in Mechanical & Aerospace Engineering Department at WVU. Dr, Liu’s main research interests are advanced high temperature materials for next generation energy conversion and storage. His research focuses are Ni-base superalloys and solid oxide fuel cells. Dr. Liu has received numerous awards including R&D 100 Award (2011), TMS Early Career Faculty Fellow Award (2010), TMS Brimacombe Medallist (2016), WV Innovator of the Year (2013), WVU CEMR Researcher of the Year (2015, 2011), Outstanding Researcher Awards (2015, 2011, 2009, 2008), and others. In 2015, Dr. Liu was elected as the Fellow of ASM International.
