Microstructure and Local Strain Fields in a High‐Alloyed Austenitic Cast Steel and a Steel‐Matrix Composite Material after in situ Tensile and Cyclic Deformation |
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Authors: | A Weidner A Yanina S Guk R Kawalla H Biermann |
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Affiliation: | 1. Institute of Materials Engineering, Technische Universit?t Bergakademie Freiberg, 09596 Freiberg, Germany;2. Institute of Metal Forming, Technische Universit?t Bergakademie Freiberg, 09596 Freiberg, Germany |
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Abstract: | The tensile and cyclic deformation behaviour of a new metastable austenitic stainless cast TRIP (TRansformation Induced Plasticity) steel and a composite material consisting of austenitic steel matrix (AISI 304) with 5% MgO partially stabilized ZrO2 (MgO‐PSZ) was studied in‐situ in a scanning electron microscope (SEM). In‐situ tests in the SEM show the evolution of the microstructure with the strain for uniaxial deformation and the number of cycles during fatigue, respectively. Initially, deformation bands develop. In these bands, the face‐centred cubic austenite transforms into the hexagonal ε‐martensite and subsequently to the body‐centred cubic α'‐ martensite. This evolution was studied by different SEM techniques. Electron backscatter diffraction (EBSD) was applied for phase and orientation identification. The dislocation arrangement was investigated applying the electron channelling contrast imaging (ECCI) technique to different deformation stages. The studies are completed with measurements of local displacement fields using digital image correlation (DIC). |
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Keywords: | digital image correlation phase transformation stacking faults TRIP matrix composite TRIP steel |
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