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"Habit plane determination from reconstructed parent phase orientation " by Tuomo Nyyssönen, Azdiar A. Gazder et al.

This study details the development and validation of a new algorithm that determines the dominant habit plane of a transformed child phase from orientation maps of a single planar cross-section. The method describes the habit plane in terms of its five-parameter grain boundary character and couples it to the specific orientation relationship of the identified orientation variant. The symmetry operations associated with the specific orientation relationship of the variants are applied to transform habit plane traces as determined in the specimen-fixed reference frame into the parent or child reference frame, allowing for the fitting of the habit plane. Our algorithm stands out by its robustness, computational efficiency, automation and ability to operate on fully transformed microstructures. Four automated methods for habit plane trace determination are proposed and compared. Detailed sensitivity analysis reveals that the proposed algorithm is exceptionally robust against poor accuracy ....

Electron Backscattering Diffraction Ebsd , Abit Plane , Rientation Relationship , Arent Grain Reconstruction , Phase Transformation ,

"Void Formation and Crack Propagation in a Cr–Mn–N Metastable Austeniti" by Hamidreza Kamali, Haibo Xie et al.

Microstructure evolution via deformation-induced martensitic transformation, void formation, and crack propagation is investigated in a metastable austenitic Cr–Mn–N stainless steel for up to 90° bending using a combination of electron backscattering diffraction and parent grain reconstruction. Stress–strain heterogeneity and stress triaxiality studied using finite-element analysis reveal that the inner and outer radii are in approximately uniaxial compressive and tensile stress states, respectively, with the outer radius showing higher values for von Mises and principal stresses and equivalent strain. Voids are observed at both austenite/α′-martensite and α′/α′-martensite interfaces. Parent grain reconstruction applied to the 90° bending sample reveal that the cracks at α′/α′-martensite interfaces tend to propagate predominantly along intergranular parent austenite grain boundaries. It is also found that both intragranular and intergranular cracks in parent aust ....

Electron Backscattering Diffraction Ebsd , Arent Grain Reconstruction , Hase Transformations , Ransformation Induced Plasticity Trip , Winning Induced Plasticity Twip ,

"The variant graph approach to improved parent grain reconstruction" by Ralf Hielscher, Tuomo Nyyssönen et al.

The variant graph is a new, hybrid algorithm that combines the strengths of established global grain graph and local neighbor level voting approaches, while alleviating their shortcomings, to reconstruct parent grains from orientation maps of partially or fully phase-transformed microstructures. The variant graph algorithm is versatile and is capable of reconstructing transformation microstructures from any parent-child combination by clustering together child grains based on a common parent orientation variant. The main advantage of the variant graph over the grain graph is its inherent ability to more accurately detect prior austenite grain boundaries. A critical examination of Markovian clustering and neighbor level voting as methods to reconstruct prior austenite orientations is first conducted. Following this, the performance of the variant graph algorithm is showcased by reconstructing the prior austenite grains and boundaries from an example low-carbon lath martensite steel micr ....

Electron Backscattering Diffraction Ebsd , Rientation Relationship Or , Parent Phase Reconstruction , Phase Transformation ,

"In-situ observation of nucleation, growth and interaction of deformati" by Frank Niessen, Azdiar A. Gazder et al.

"In-situ observation of nucleation, growth and interaction of deformati" by Frank Niessen, Azdiar A. Gazder et al.
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Electron Backscattering Diffraction Ebsd , Titanium Alloys , Ransmission Electron Microscopy Tem ,