Nickel-base superalloy with high crack extension resistance
A high-temperature alloy and crack propagation technology, which is applied in the field of nickel-based powder metallurgy superalloys, can solve problems affecting the application of alloys, etc.
Inactive Publication Date: 2014-05-28
CENT IRON & STEEL RES INST
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Problems solved by technology
However, there is a problem of crack propagation in powder superalloys formed by direct hot isostatic pressing, which seriously affects the application of the alloy.
Method used
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[0011] The present invention will be further described below by specific examples.
[0012] (1) The content of nickel-based powder metallurgy superalloy Alloy-1 by mass percentage is: Co19.8%, Cr12.0%, W5.6%, Mo3.9%, Al5.1%, Ti1.8%, Nb2. 6%, C0.04%, B0.012%, Zr0.015%, Hf0.15~0.9%, the balance is Ni.
[0013] It is powdered by a plasma rotating electrode, and the powder particle size ranges from 50 to 150 μm. After hot isostatic pressing, it is then subjected to solution heat treatment, and the cold-rolled alloy plate is subjected to solution heat treatment in a box-type resistance furnace. The temperature is 870°C, the holding time is 2.9h, water quenching; aging heat treatment: divided into the following five steps: the aging temperature is 330°C, the holding time is 19min, water quenching; and then heated to 420°C for the second aging treatment, aging The time is 1.9h, water quenching; then heated to 485°C for the third aging, the aging time is 2h, water quenching; then hea...
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Abstract
The invention relates to nickel-base superalloy with high crack extension resistance in the field of nickel-base powder metallurgical superalloy. The superalloy contains, by mass, 15.8% of Co, 9.0% of Cr, 5.6% of W, 3.9% of Mo, 5.1% of Al, 1.8% of Ti, 2.6% of Nb, 0.04% of C, 0.012% of B, 0.015% of Zr, 0.15-0.9% of Hf and the balance Ni. Phase composition of a second phase strengthening phase gamma' in the superalloy is (Ni0.854-0.857Co0.143-0.146)3(Al0.767-0.781Ti0.129Nb0.088Hf0.002-0.016), and the size of the second phase is 284-511nm. The second gamma' phase accounts for 81.9-85.3 wt% of the mass of the total gamma' phase. A first gamma' phase and a third gamma' phase account for 14.7-18.1 wt% of the mass of the total gamma' phase. With the addition of the trace element Hf, composition, size and quantity of the main phases in the alloy have changed after the same heat treatment of the nickel-base powder metallurgical superalloy prepared by plasma rotating electrode pulverization and direct hot isostatic pressing forming. The crack extension rate is lower than that of an alloy without the addition of Hf, and the crack extension rate of an alloy containing 0.3% of Hf is the lowest.
Description
technical field [0001] The invention belongs to the field of nickel-based powder metallurgy superalloy preparation, in particular to a nickel-based powder metallurgy superalloy with high crack propagation resistance among nickel-based powder metallurgy superalloys. Background technique [0002] Superalloys produced by powder metallurgy technology have excellent characteristics such as fine grains, uniform structure, no macro-segregation, good thermal processing performance and mechanical properties, and are widely used in hot-end parts such as advanced engine turbine disks in the aerospace field. However, there is a problem of crack propagation in the powder superalloy formed by direct hot isostatic pressing, which seriously affects the application of the alloy. At present, the measures to improve the crack growth resistance of the alloy are mainly to improve the production process and adjust the alloy composition. The chemical composition of the alloy determines the perfor...
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IPC IPC(8): C22C19/05C22C1/04
Inventor 王文姣
Owner CENT IRON & STEEL RES INST