METHOD OF HEAT TREATMENT OF NI BASED SUPERALLOY FOR WAVE TYPE GRAIN-BOUNDARY AND NI BASED SUPERALLOY THE SAME

摘要

PURPOSE: Ni based alloy for wave type grain-boundary and a heat treatment method thereof are provided to induce precipitation of low density carbide with low interfacial energy by performing solid solution treatment and aging treatment. CONSTITUTION: A heat treatment method for Ni based alloy comprises a step of performing solid solution treatment in a high temperature range of 1000~1200°C, a step of cooling the treated material at 1~15°C/min to a middle temperature range of 700~900°C for aging treatment immediately after the solid solution treatment, a step of performing aging treatment to keep in the middle temperature range for a certain time period, and step of performing air cooling.