Morphology and distribution characteristics of dendrites and inclusions in GH4169 revert alloy
Morphology,size and distribution characteristics of dendrites and inclusions in GH4169 revert alloy were studied using optical microscope,scanning electron microscopy and X-ray diffraction.By comparing the microstructure of the revert alloy and the virgin alloy,the growth process of dendrites and the formation reasons of inclusions in the revert alloy during solidification were analyzed.The results show that the alloy elements in the GH4169 revert alloy are basically the same as those in the virgin alloy,but the N and O content increases significantly.The solidification structure of the revert alloy is columnar crystals,and the growth direction is from the edge to the center.The variation law of primary and secondary dendrite arm spacing is consistent.The closer it is to the center of the sample,the larger the dendrite spacing.There are inclusions of NbC and TiN and two-phase inclusions of Laves+NbC between the dendrites.The microhardness of the revert alloy shows a gradually increasing trend from the center to the edge,and the presence of intergranular inclusions has little effect on the hardness of the alloy.
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