Evolution of Intragranular Misorientation during Plastic Deformation

Mino Kazuaki, Fukuoka Chie, Yoshizawa Hiroki

doi:10.2320/jinstmet1952.64.1_50

With the aim of measuring local strain distribution using electron back-scattered diffraction (EBSD), the evolution of intragranular misorientation during tensile and creep deformations was studied. Test materials include a low-alloyed Cr-Mo steel, Type 304 stainless steel, Ni-based superalloy and pure iron, which were deformed up to 6 pct strain. Although all of the test materials were annealed, misorientations of 0.4 to 0.5 degrees were measured prior to deformation. Misorientation angles subtracted by these initial values linearly increase with plastic strain. The slope was shown to be independent of the kinds of test materials, deformation temperatures and strain rates. The ratios of misorientation angle to strain for the crept Cr-Mo steel with a ferrite-lath structure and aluminum deformed at elevated temperature, calculated from the published works, were shown to lie on the extrapolated line of the present study. TEM observations showed various deformation structures. Slip lines with 0.5 to 1 μm intervals were observed in INCO718, while a tangled dislocation structure was observed in SUS304. Dislocation tangling has developed to a preform of cellular structures in the pure iron strained to 3pct. Dislocations pinned by carbides sparsely distributed in the crept Cr-Mo steel. It was concluded from these observations that intragranular misorientation develops by local rotation of crystal orientations without forming cellular dislocation or subgrain structures.

Evolution of Intragranular Misorientation during Plastic Deformation

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