Nature and evolution of the fusion boundary in ferritic-austenitic dissimilar metal welds - Part 2: On-cooling transformations
作者： J. C. Lippold , M. J. Mills , T. W. Nelson
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摘要: Microstructural evolution at the fusion boundary in dissimilar welds between ferritic and austenitic alloys can significantly influence both weldability service behavior of combination. A fundamental investigation was undertaken to characterize microstructure better understand nature character boundaries that are associated with cracking welds. In a previous paper, during onset solidification discussed. this surrounding regions metal subsequent on-cooling transformations zone heat-affected (HAZ) will be model system consisting high-purity iron base 70Ni-30Cu (AWS A5.14 ERNiCu-7) filler used study behavior. Using simple Fe-Ni-Cu system, microstructures were developed analogous those observed more complex engineering systems. Transmission electron diffraction analysis orientation imaging microscopy (OIM) revealed relationships adjacent HAZ weld grains different than cube-on-cube relationship normally similar The room temperature studied exhibited grain misorientations consistent common FCC/BCC relationships, i.e., Bain, Kurdjumov-Sachs Nishyama-Wassermann. theory describing is proposed Type II described.
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