Study on heat treatment of new nitride dispersion enhanced superalloy after nitriding
The new internal nitride dispersion enhanced superalloy has excellent mechanical properties at high temperature.One of the main existing problems is that the alloys have poor plasticity at room temperature after nitriding.In order to improve the room temperature plasticity after nitriding,the high temperature recovery heat treatment process of NS163 alloy after nitriding was studied by heat treatment at 1 150-1 280 ℃ to regulate the morphology and distribution of nitriding alloy plate.The results show that the high temperature recovery heat treatment can eliminate the Cr-containing nitrides precipitated near the surface grain boundary and in the crystal during the nitriding process,and then the plasticity of the alloy sheet can be restored.The fine granular nitrides precipitated in the crystal can maintain good thermal stability during high temperature heat treatment.The optimum temperature of recovery heat treatment is 1 240 ℃.
new internal nitride dispersion enhancementsuperalloyhigh temperature recovery treatmentheat treatmentmechanical property
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