TY - CHAP A1 - Lindemann, Janny A1 - Roth-Fagaraseanu, Dan A1 - Wagner, Lothar T1 - Mechanical Surface Treatments for Enhancing Fatigue Performance of Gamma Titanium Aluminides at Ambient and Elevated Temperatures Y1 - 2003 ER - TY - GEN A1 - Bolz, Sebastian A1 - Oehring, Michael A1 - Lindemann, Janny A1 - Pyczak, Florian A1 - Paul, Jonathan A1 - Stark, Andreas A1 - Lippmann, Thomas A1 - Roth-Fagaraseanu, Dan A1 - Schreyer, Andreas A1 - Weiß, Sabine A1 - Schrüfer, Susanne T1 - Microstructure and mechanical properties of a forged beta-solidifying gamma TiAl alloy in different heat treatment conditions T2 - Intermetallics Y1 - 2015 VL - 2015 IS - 58 SP - 71 EP - 83 ER - TY - GEN A1 - Oehring, Michael A1 - Lindemann, Janny A1 - Pyczak, Florian A1 - Paul, Jonathan A1 - Stark, Andreas A1 - Lippmann, Thomas A1 - Schrüfer, Susanne A1 - Roth-Fagaraseanu, Dan A1 - Schreyer, Andreas A1 - Weiß, Sabine T1 - Microstructure and mechanical properties of a forged β-solidifying γ TiAl alloy in different heat treatment conditions T2 - Intermetallics N2 - In the cast condition g titanium aluminide alloys that solidify completely through the b phase are characterized by fine and homogeneous microstructures, weak textures and low segregation. For these reasons such alloys have a relatively good workability and can be closed-die forged without preceding ingot breakdown even if the alloys contain no large fractions of the b phase at the working temperature. The present work was devoted to a combined study of the constitution and microstructural morphologies that develop in various two-step heat treatments of a single-step forged b solidifying alloy. The study included high-energy X-ray diffraction for in situ investigations of the constitution at the heat treatment temperature. It was observed that the phase ransformations are quite sluggish in the material which results in fine microstructures and some conditions that significantly deviate from thermodynamic equilibrium. Further, tensile and creep testing was carried out on the different material conditions in order to identify the range in which the properties can be varied. It is found that this easily forgeable material exhibits comparable strength, ductility and creep strength as more conventional peritectically solidifying alloys. KW - TiAl KW - Titanium Aluminides KW - hot die forging KW - TNB-V4 Y1 - 2015 UR - http://www.sciencedirect.com/science/article/pii/S096697951400301X U6 - https://doi.org/10.1016/j.intermet.2014.11.008 SN - 0966-9795 VL - 2015 IS - 58 SP - 71 EP - 83 ER - TY - CHAP A1 - Lindemann, Janny A1 - Glavatskikh, Maria A1 - Leyens, Christoph A1 - Roth-Fagaraseanu, Dan ED - Kim, Young-Won T1 - Effect of Small Boron and Carbon Additions on the Mechanical Properties of a Novel High Niobium-Containing Gamma Titanium Aluminide Alloy T2 - Structural aluminides for elevated temperatures, proceedings of the Structural Aluminides for Elevated Temperatures Symposium, held during TMS 2008 annual meeting & exhibition, New Orleans, Louisiana, USA, March 9 - 13, 2008 KW - Gamma titanium aluminides KW - Mechanical properties KW - Fatigue KW - Creep Y1 - 2008 SN - 978-0-87339-720-9 SP - 257 EP - 264 PB - TMS CY - Warrendale, Pa. ER - TY - THES A1 - Roth-Fagaraseanu, Dan T1 - Entwicklung und Bewertung von Herstellprozessen für TiAl Verdichterschaufeln Y1 - 2008 SN - 978-3-8322-7496-2 PB - Shaker CY - Aachen ER - TY - CHAP A1 - Lindemann, Janny A1 - Roth-Fagaraseanu, Dan A1 - Wagner, Lothar T1 - Notch Effects on HCF Strength of Gamma Titanium Aluminides Y1 - 2003 ER - TY - CHAP A1 - Lindemann, Janny A1 - Roth-Fagaraseanu, Dan A1 - Wagner, Lothar T1 - Effect of Shot Peening on Fatigue Performance of Gamma Titanium Aluminides T2 - Shot peening, proceedings of the 8th International Conference on Shot Peening (ICSP-8) in Garmisch-Partenkirchen, Germany, 16 - 20 September 2002 Y1 - 2003 SN - 3-527-30537-8 SP - 392 EP - 398 PB - Wiley-VCH CY - Weinheim ER - TY - CHAP A1 - Lindemann, Janny A1 - Roth-Fagaraseanu, Dan A1 - Wagner, Lothar ED - Kim, Nack J. ED - Lee, C. S. ED - Eylon, D. T1 - Surface Strengthening for Optimizing Fatigue Performance of Gamma Titanium Aluminides at Ambient and Elevated Temperatures, Light Materials for Transportation Systems T2 - Proceedings of the Second International Conference on Light Materials for Transportation Systems (LiMAT-2001) held at Pusan, Korea, May 6 - 10, 2001, Vol. 2 Y1 - 2001 PB - Center for Advanced Aerospace Materials CY - Pohang ER -