High temperature alloy of nickel based monocrystalline capable of bearing high temperature

Abstract

This invention discloses a nickel-based monocrystalline alloy with good heat-bearing ability. The alloy comprises: W 3-4 wt.%, Mo 3-4 wt.%, Ta 7-8 wt.%, Al 5-7 wt.%, Ti 0.5-1.5 wt.%, Cr 3-5 wt.%, Co 8-10 wt.%, Re 2-3 wt.%, Nb 0.5-1 wt.%, and Ni. The alloy comprises less Re than CMSX-4 alloy. The solid solution temperature of the alloy is thus increased by 5-10 deg.C. The alloy also has better room temperature stretching property and better heat-bearing ability than CMSX-4 alloy, thus can be used in aeroengine with high weight bearing.

Description

technical field [0001] The invention belongs to the field of nickel-based single crystal high-temperature alloys, and more particularly refers to an alloy material suitable for processing hot-end parts such as aeroengine turbine blades used at high temperatures (1100° C.). Background technique [0002] With the development of aero-engines towards high thrust-to-weight ratios, the temperature of the gas inlet before the turbines continues to increase, requiring higher temperature-bearing capabilities for engine hot-end components such as turbine blades and guide vanes. In order to improve the temperature bearing capacity, the alloying method with low Cr and high total amount of refractory elements (W, Mo, Nb, Ta, Re, etc.) is often used at present. In particular, the addition of Re significantly improves the high temperature durability and creep properties of Ni-based single crystal alloys. After adding 3wt% and 6wt% Re to the single crystal alloy, its temperature bearing ca...

AI Technical Summary

Problems solved by technology

However, Re is expensive and has a large specificity. Considering the alloy cost and application prospects, Re restricts the development and application of single crystal superalloys.