Effect of nature of grain boundaries on intergranular liquation during weld thermal cycling of nickel base alloy
作者： H. Guo , M. C. Chaturvedi , N. L. Richards
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摘要: AbstractAn Inconel 718 based alloy containing only trace amounts of C, S, and P was subjected to thermal cycling in a Gleeble 1500 system induce microstructural features which are produced the heat affected zone (HAZ) during welding. In thermally cycled material many grain boundaries were observed liquate; however, liquation heterogeneously distributed, that is, some boundaries, often few segments same boundary, liquated. Orientation imaging microscopy electron backscatter diffraction analysis scanning microscope revealed liquated or boundary always non-special geometry (or random) whereas low reciprocal volume density Σ coincident site lattice twin did not liquate. Therefore, it is concluded extent B segregation, H AZ welding has been attributed, greater on random boundaries...
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