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Gamma Titanium Aluminide Alloys 2014: A Collection of Research on Innovation and Commercialization of Gamma Alloy Technology

Gamma Titanium Aluminide Alloys 2014: A Collection of Research on Innovation and Commercialization of Gamma Alloy Technology

Young-Won Kim (Editor), Wilfried Smarsly (Editor), Junpin Lin (Editor), Dennis Dimiduk (Editor), Fritz Appel (Editor)

ISBN: 978-1-119-01716-5

Sep 2014

224 pages



This book is a collection of papers presented at the 4th International Symposium on Gamma TiAl Alloys (ISGTA 2014) that was held in conjunction with the 2014 Annual Meeting of The Minerals, Metals & Materials Society. Papers discuss and assess advances in application and implementation experience in current alloys, fundamental
aspects in current gamma alloy materials technology, new processes development and assessment, and emerging new alloys, their potentials and limitations, and breakthroughs.

Papers that originated in the panel discussion of the symposium are intended to help the scientific community realize the limitations of current alloys materials and processes and discuss possible solutions. Six topic areas selected for this purpose included:
  1. Wrought-processed alloys: status, dilemmas and pathways to future
  2. Cast alloys for aero engine applications: status, issues, and barriers to advances
  3. Cast alloys for turbocharger wheels: status and barriers to widespread applications
  4. Emerging new alloys: justification, potentials, status, and future
  5. Novel processes: justification, potential vs. realization issues, and future
  6. Future applications and realistic pathways to them
Preface viii

Editors x

Alloy Design and Development

Alloy Design Concepts for Wrought High Temperature TiAl Alloys 3
J. Lin, X. Xu, L. Zhang, Y. Liang, Y. Xu, and G. Hao

Physical Metallurgy and Performance of the TNB and y-Md Alloys 9
F. Appel, M. Oehring, and J. Paul

A Quarter Century Journey of Boron as a Grain Refiner in TiAl Alloys 21
D. Hu

Composition Optimization of B-y TiAl Alloys Containing High Niobium 31
L. Zhang, J. Zheng, Y. Hou, X. Ma, X. Xu, and J. Lin

Processing and Fabrication

Impact of ISM Crucible Tilting Process on Mould Filling and Yield of Near-net Shape TiAl Turbine Blades 39
O. Kattlitz, J. Aguilar, and S. Jana

The Effect of Mould Pre-Heat Temperature and Casting Dimensions on the Reaction Between TiAl Alloy and the Zirconia Investment Casting Moulds 45
C. Yuan, X. Cheng, D. Shevchenko, G. Holt, and P. Withey

Experimental Research on the Recycling Potential of Precision Casty-TiAl During Electroslag Remelting 51
M. Bartosinski, C. Lochbichler, J. Reitz, P. Spiess, B. Friedrich, T. Stoyanov, and J. Aguilar

Influence of the Slag Composition on the Fluorine Absorption in y-TiAl during IESR 59
P. Spiess, and B. Friedrich

Response of Melt Treatment on the Solidified Microstructure of Ti-48Al-2Cr-2Nb Alloy 65
G. Yang, H. Kou, J. Yang, J. Wang, J. Li, and H. Fu

Recent Development and Optimization of Forging Process of High Nb-TiAl Alloy 71
X. Xu, J. Lin, L. Zhang, and Y. Liang

Fabrication of TiAl Alloys by Alternative Powder Metallurgical Methods 77
M. A. Largos, I. Agote, J.M. San Juan, and J. Hennicke

Manufacturing and Properties of High Nb-TiAl Sheet Materials 83
Y. F. Liang, Z. Z. Shen, H. Wang, L. Q. Zhang, X. J. Xu, Y. Xu, G. J. Hao, and J. P. Lin

Reaction Behavior during Heating of Multilayered Ti/Al Foils 87
Z. Shen, Y. Liang, L. Zhang, G. Hao, J. He, and J. Lin

High Nb Content TiAl Alloys Specified to Cast Process 93
H. Li, and J. Zhang

Joining and Surface Protection

Electron Beam Joining of y-Titanium Aluminide 99
U. Reisgen, S. Olschok, and A. Backhaus

Mechanical Properties and Microstructure of a TNM Alloy Protected by the Fluorine Effect and Coated with a Thermal Barrier 105
A. Straubel, S. Friedle, M. Schiitze, N. Laska, R. Braun, and C. Leyens

Wear Protection for Turbine Blades Made of Titanium Aluminide Ill
A. Werner, W. Smarsly, and J. Efilinger

Effect of Er Addition on Microstructure and Oxidation Resistance of High Nb Containing TiAl Alloys 117
L. Chai, Z. Gong, F. Zhou, Z. Chen, and Z. Nie


Fundamental and Application-Oriented Research on Gamma Alloys 123
R. Yang

Deformation of PST Crystals of Ti46A18Nb and Ti46A18Ta 135
Y. Guo, R. Liu, H. Jin, R. Yang, A. Huang, and M. Loretto

Seeded Growth of Ti-47Al-2Cr-2Nb PST Crystals 143
H. Jin, R. Liu, Y. Cui, Q. Xian, D. Xu, and R. Yang

Textures of Rectangular Extrusions of Ti-47Al-2Cr-2Nb-0.15B 149
R. Liu, D. Liu, J. Tan, Y. Cui, and R. Yang

Microstructure and Properties

Origin and Magnitude of Internal Stresses in TiAl Alloys 161
R. Hoppe, and F. Appel

Effects of Microstructure, Alloying and C and Si Additions on Creep of Gamma TiAl Alloys 169
Y. Kim, and S Kim

Microstructure and Properties of Cast Ti-46Al-8Ta Alloy 179
J. Lapin, Z. Gabalcova, O. Bajana, T. Pelachova, H. Stanekova, and K. Frkanova

Effect of the Microstructure on the Deformation and Fatigue Damage in a Gamma-TiAl Produced by Additive Manufacturing Metallurgy Ti-47 Al-2Cr-2Nb-0.15B 189
M. Filippini, S. Beretta, L. Patriarca, and S. Sabbadini

Effect of Powder Pre-Treatment on the Mechanical Properties of Powder 195
L. Xu, J. Wu, Y. Cui, and R. Yang

Microstructure and Mechanical Properties of TiAl Alloys Produced by Powder Metallurgy 203
F. Kong, N. Cui, Y. Chen, D. Zhang, and Y. Su

Author Index 207

Subject Index 209