Christoph Breuner
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Christoph Breuner has a total of 5 co-authors. Here are the top co-authors by number of shared publications:
- Elias Gall
Karlsruhe Institute of Technology, IAM-WK Institute for Applied Materials, Engelbert-Arnold-Straße 4, 76131 Karlsruhe, Germany
1 shared publication - Jens Gibmeier
Institute for Applied Materials, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
1 shared publication - Martin Heilmaier
Institute for Applied Materials—Materials Science and Engineering Karlsruhe Institute of Technology Karlsruhe Germany
1 shared publication - Radosław Swadźba
Institute for Ferrous Metallurgy
1 shared publication - Stefan Guth
Karlsruhe Institute of Technology Institute for Applied Materials Engelbert‐Arnold‐Straße 4 Karlsruhe Germany
1 shared publication
Latest Publications
- Open Access
Influence of Shot Peening on the Isothermal Fatigue Behavior of the Gamma Titanium Aluminide Ti-48Al-2Cr-2Nb at 750 °C
One possibility to improve the fatigue life and strength of metallic materials is shot peening. However, at elevated temperatures, the induced residual stresses may relax. To investigate the influence of shot peening on high-temperature fatigue behavior, isothermal fatigue tests were conducted on shot-peened and untreated samples of gamma TiAl 48-2-2 at 750 °C in air. The shot-peened material was characterized using EBSD, microhardness, and residual stress analyses. Shot peening leads to a significant increase in surface hardness and high compressive residual stresses near the surface. Both effects may have a positive influence on lifetime. However, it also leads to surface notches and tensile residual stresses in the bulk material with a negative impact on cyclic lifetime. During fully reversed uniaxial tension-compression fatigue tests (R = −1) at a stress amplitude of 260 MPa, the positive effects dominate, and the fatigue lifetime increases. At a lower stress amplitude of 230 MPa, the negative effect of internal tensile residual stresses dominates, and the lifetime decreases. Shot peening leads to a transition from surface to volume crack initiation if the surface is not damaged by the shots.
Open AccessInfluence of Shot Peening on the Isothermal Fatigue Behavior of the Gamma Titanium Aluminide Ti-48Al-2Cr-2Nb at 750 °C
One possibility to improve the fatigue life and strength of metallic materials is shot peening. However, at elevated temperatures, the induced residual stresses may relax. To investigate the influence of shot peening on high-temperature fatigue behavior, isothermal fatigue tests were conducted on shot-peened and untreated samples of gamma TiAl 48-2-2 at 750 °C in air. The shot-peened material was characterized using EBSD, microhardness, and residual stress analyses. Shot peening leads to a significant increase in surface hardness and high compressive residual stresses near the surface. Both effects may have a positive influence on lifetime. However, it also leads to surface notches and tensile residual stresses in the bulk material with a negative impact on cyclic lifetime. During fully reversed uniaxial tension-compression fatigue tests (R = −1) at a stress amplitude of 260 MPa, the positive effects dominate, and the fatigue lifetime increases. At a lower stress amplitude of 230 MPa, the negative effect of internal tensile residual stresses dominates, and the lifetime decreases. Shot peening leads to a transition from surface to volume crack initiation if the surface is not damaged by the shots.