Abstract
The nucleation and growth of fine austenitic grain at interface of L415QS/N08825 bimetallic composite pipe achieved by explosive welding is systematically studied. Results show that the L415QS/N08825 interface have heat affected zone (HAZ) that is similar with GH2132 superalloy (Fe-25Ni-15Cr). Two kinds of austenitic grains: columnar grains and ultra-fine equiaxed grain with large angle grain boundaries were identified at HAZ that nucleated from both L415QS and N08825 base alloy in the melts zone, and the growth of the nucleus is based on the size of melts zone. Room temperature nanoindetation test revealed that these fine equiaxed and columnar austenitic grains exhibit enhanced hardness compared with those of the base metals.
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