RHENIUM-FREE LOW DENSITY HIGH PERFORMANCE NICKEL-BASED SINGLE CRYSTAL SUPERALLOY AND HEAT TREATMENT PROCESS THEREOF

摘要

Disclosed are a rhenium-free low density high performance nickel-based single crystal superalloy and a heat treatment process thereof, belonging to the field of nickel-based single crystal superalloys.The chemical components of the alloy (wt.％) are: Cr: 6.0%-8.0%, Co: 8.0%-10.0％, W: 6.0%-9.0％, Mo: 1.0%-3.0％, Nb: 0-2％, Al: 3.0%-6.0％, Ti: 1.0%-3.0％, Ta: 1.0%-5.0％, C: 0.02%-0.06％, B: 0.001%-0.003％, Ce: 0-0.02％, Y: 0-0.01％, and the balance being Ni.The alloy has an excellent low temperature, intermediate temperate and high temperature strength, and oxidation resistance, and the durability and low cycle fatigue properties are equivalent to those of the second generation single crystal superalloy CMSX-4 containing 3 wt.% of Re. The alloy does not contain the noble element Re, reduces the cost of the alloy by 70% or more, and reduces the density of the alloy by about 3%.