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Ahiale, Godwin Kwame; Yoo, Ji Sung; Lee, Sunghak; Park, Dong Yong; Oh, Yong-Jun
Materials science & engineering. A, Structural materials : properties, microstructure and processing, 05/2018, Letnik: 725Journal Article
We present the evolution of crystallographic orientation and microstructure during thermomechanical fatigue (TMF) of heat-resistant cast austenitic stainless steel at peak temperatures reaching 950 °C using the electron backscatter diffraction (EBSD) method. Higher restraints or peak temperatures induced larger crystal misorientation by geometrically necessary dislocations (GNDs), forming dislocation walls or subgrains in the grains. Networked carbide clusters in the microstructure locally amplified the misorientation in the adjacent matrix and initiated fatigue cracks. The mean value of cumulative misorientations over a specific distance in the matrix was linearly proportional to the cyclic plastic strain.
