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学术报告——Co-base superalloys,University of Erlangen-Nürnberg
发布日期:2017-5-15 11:36:57 阅读次数:287

新金属材料国家重点实验室系列学术讲座

SKL-AMM Seminar Series 2017

报告人/SpeakerDr. Steffen Neumeier

德国埃尔朗根-纽伦堡大学副教授、钴基高温合金学术梯队负责人

报告人工作单位/AffiliationUniversity of Erlangen-Nürnberg,

                         Department of Materials Science and Engineering

日期/Date 2017515(星期一)/ May. 15 (Monday), 2017, 3:30 – 5:00 PM

           2017517(星期三)/ May. 17 (Wednesday), 2017, 2:30 – 4:00 PM

联系人/Contact冯强 教授  zoumin_1200@163.com

报告地点/Location北京科技大学主楼 353 / 353 Main Building, USTB

报告摘要/Abstract


题目/Title 1Co-Al-W based superalloys – Alloy development and challenges

时间/Time05/15  3:30–5:00 PM    地点/Location主楼353

Over the past decade the scientific interest in Co-Al-W based alloys has continuously grown, because they exhibit a g/g¢ microstructure similar to Ni-base superalloys and they have a much higher strength than conventional solid solution and carbide strengthened Co alloys. However, to be able to compete with advanced Ni-base superalloys, which are in use since over 60 years, several properties, such as the low solvus temperature, low grain boundary strength, poor oxidation behavior and high density, have to be improved by alloying. The effect of alloying elements on various properties will be presented and discussed in this talk. The findings on the role of base elements Co and Ni, refractory elements Re and W, g¢ forming elements Ti and Ta, minor elements B and C, platinum group element Ir, and Cr, which is essential for corrosion resistance, will contribute to develop multinary g/g¢ Co-base superalloys with well-balanced properties for high temperature applications.

 

 

题目/Title 2Polycrystalline γ/γ¢ Co-base superalloys – new high temperature materials beyond Ni-base superalloys

时间/Time05/17  2:30–4:00 PM    地点/Location主楼353

The discovery of the L12 phase, Co3(Al,W), in 2006 and the accompanying development of g/g¢ Co-base superalloys has begged the question whether this new type of superalloys can supersede established Ni-base superalloys that are used in gas turbines for jet engines and power plants. In this talk, it will be shown how alloy properties change, when Co gradually substitutes the base element Ni in a series of Ni-Co-Al-W-Cr g/g¢ alloys with otherwise constant element contents of Al, W and Cr. The phase transformation temperatures indicate that g/g¢ Co-based superalloys have a great potential as wrought alloys, because a high g¢ volume fraction can be achieved and their g¢ solvus temperatures are comparatively low, which gives a large processing window. In comparison to conventional cast & wrought Ni-base superalloys, recently developed high-strength polycrystalline Co-base superalloys, that will be presented and discussed in the talk, have a higher yield strength and a superior creep strength at temperatures above 750°C.


作者简介/Speaker’s short biography

Dr.-Ing. Steffen Neumeier is a group leader at the Department of Materials Science and Engineering of the Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Germany. He studied Materials Science and Engineering at the FAU, where he received his Diploma in 2006. Afterwards he did his PhD from 2006 to 2009 on 4th generation Ni-base superalloys in the group of Prof. M. Göken at the FAU, from where he obtained his doctorate degree in 2010. During his postdoc from 2009 to 2010 in the group of Prof. C. Rae and Dr. H. Stone at the Rolls-Royce-University Technology Center of the University of Cambrigde, UK, he worked on the identification and development of novel alloys for high temperature structural applications. Since 2011, he leads the “High temperature materials group” at the Institute I, General Materials Properties, and is a lecturer at the FAU. Dr. Neumeier’s primary research focus is on the correlation between composition, microstructure and mechanical properties of high temperature materials, such as Ni- and Co-based superalloys, Titanium Aluminides, Intermetallics and Coatings. His further scientific interests are the characterization of structural materials by X-ray and neutron scattering and diffraction techniques.

Dr. Steffen Neumeier received the Young scientist award in 2010 and the Masing Memorial Award in 2016 of the German Society for Materials Science (DGM). He authored 45 peer-reviewed journal and proceeding articles in the field of materials science and has five patent applications.

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