TY - CHAP A1 - Glavatskikh, Maria A1 - Lindemann, Janny A1 - Leyens, Christoph A1 - Oehring, Michael A1 - Appel, Fritz ED - Kim, Young-Won T1 - Surface Strengthening for Enhanced Fatigue Performance of Gamma Titanium Aluminides 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 - Shot peening KW - Roller burnishing KW - High cycle fatigue Y1 - 2008 SN - 978-0-87339-720-9 SP - 111 EP - 118 PB - TMS CY - Warrendale, Pa. ER - TY - CHAP A1 - Lindemann, Janny A1 - Glavatskikh, Maria A1 - Leyens, Christoph A1 - Oehring, Michael A1 - Appel, Fritz T1 - Influence of Mechanical Surface Treatments on the High Cycle Fatigue Performance of Gamma Titanium Aluminides Y1 - 2007 ER - TY - JOUR A1 - Lindemann, Janny A1 - Kutzsche, Anja A1 - Oehring, Michael A1 - Appel, Fritz T1 - Influence of Mechanical Surface Treatments on the Fatigue Performance of the Gamma TiAl Alloy Ti-45Al-9Nb-0.2C JF - Materials Science Forum Y1 - 2007 SN - 0255-5476 VL - 539-543 SP - 1553 EP - 1558 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 -