Novel directed nickel-base high temperature alloy

Abstract

The invention belongs to the field of metallic materials and relates to a novel directed nickel-base high temperature alloy for hold end parts and components of a gas turbine. The chemical ingredients of the alloy and mass percents of the chemical ingredients are as follows: 3.0-5.5% of Al, 0.5-4.0% of Ti, 9.0-12.0% of Cr, 5.0-7.0% of Ta, 7.0-10.0% of Co, 4.0-7.0% of W, 1.0-3.0% of Mo, 0-2.0% of Hf, 0-4% of Re, 0.02-0.15% of C, 0.002-0.02% of B, and the balance of nickel. The novel directed nickel-base high temperature alloy disclosed by the invention has good high temperature strength, tissue stability, casting performance and high temperature and hot corrosion resistance, no TCP phase is separated out after the alloy is aged at 900 DEG C for 50000h, the salt coated hot corrosion resistance of the alloy disclosed by the invention at 900 DEG C is close to that of a DS GTD111 alloy, and the temperature bearing capability of the alloy disclosed by the invention is 10-20 DEG C higher than that of the DS GTD111 alloy, so that the alloy disclosed by the invention is suitable for casting directed thin-walled hollow casting.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a novel oriented nickel-based superalloy used for hot-end components of gas turbines. Background technique [0002] The key to improving the turbine inlet temperature and gas turbine performance is to increase the temperature bearing capacity of the blades. The improvement of the temperature bearing capacity of the blades depends on the improvement of the material temperature bearing capacity and the application of cooling technology. Compared with aero-engines, gas turbine blades have a much harsher working environment for hot-end parts of gas turbines. Most ground gas turbines use diesel or low-quality fuel oil, which contains impurities such as sulfur and sodium, which cause thermal corrosion and have a great damage to high-temperature alloy components. ; The life expectancy is long, usually tens of thousands or even hundreds of thousands of hours; the time to bear the basic load ...

AI Technical Summary

Problems solved by technology

From the perspective of manufacturing cost, the process flow of oriented parts is relatively simple, the yield is high, the inspection cost is low, and the casting cost is lower than that of single crystal parts. Therefore, oriented materials are widely used in aero-engines; especially for ground gas turbines, the engine size Large, using single crystal parts, the corresponding manufacturing difficulty and manufacturing cost are greatly increased

Images