A kind of superalloy forging heat treatment method and product thereof
A technology of forging heat treatment and high-temperature alloys, applied in the field of forging, can solve the problems of heat treatment temperature, high temperature performance and structure, coarse grain size, narrow forging temperature range, etc., and achieve the effect of reducing the risk of cracking and high strength
Active Publication Date: 2022-05-13
GUIZHOU AVIATION TECHN DEV
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Problems solved by technology
The forging temperature range of Haynes 244 alloy is relatively narrow compared with other types of superalloys, and forging cracks are prone to occur during forging
If the forging temperature is too low, the surface cracks after forging will be more serious. If the temperature is too high, it will easily lead to coarse grain size or the microstructure and properties cannot meet the requirements for use. The heat treatment temperature has a great influence on its high temperature performance and microstructure.
This material is a new type of material in the domestic forging industry. Its forging and heat treatment parameters and product performance and organizational laws have no reference value, and the material is prone to cracks during the forging process, so it is difficult to be used in current industrial manufacturing.
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[0030] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0031] The chemical composition of a superalloy is shown in Table 1:
[0032] Table 1 Chemical composition of superalloys
[0033]
[0034] The following forging and heat treatment methods are adopted for the alloy of the above composition, and the steps are as follows:
[0035] Step 1: Cut the alloy raw materials in Table 1 into 5 sections of φ200mm×70mm for forging, heating temperature T h Set to 1000°C, 1050°C, 1080°C, 1100°C, 1150°C, holding time W x According to the formula: the effective thickness of the bar × 6min / 10mm to calculate, the amount of deformation S a Select 10%, 15%, 21%, 29%, and 30%, check the grain size of the forging after forging, take the average value, and obtain the grain size after forging for each fire, as shown in Table 2 below.
[0036] Table 2 The heat treatment scheme and result...
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Abstract
The invention discloses a forging and heat treatment method of a superalloy and a product thereof, belonging to the technical field of alloy forging. The alloy components are calculated by weight percentage: Mo: 21‑24, Cr: 7‑10, Wu: 5‑8, Fe: ≤2, Mn: ≤0.8, Al: ≤0.5, C: ≤0.03, and the rest are Ni . The advantage is that the service temperature of the product manufactured by this method can reach 760°C, and when used at 760°C, it has low expansion and high strength. )≥552, elongation (%)≥13, and reduction of area (%)≥16, effectively reducing the risk of alloy cracking during forging.
Description
technical field [0001] The invention relates to a forging method, in particular to a forging method of a superalloy. Background technique [0002] The thermal expansion of metals and alloys is caused by the non-coordinated vibration of the lattice lattice. The volume of ordinary metal materials expands almost linearly with the rise of temperature. Between 20°C and 80°C, in terms of linear expansion coefficient a, ferritic heat-resistant steel is usually about 10~14X10 6 / ℃, Ni-based superalloy is about 12~16X10 6 / ℃, Fe-Ni base superalloy is about 14~17X10 6 / ℃, austenitic steel is about 16 ~ 19X10 6 / °C. However, certain alloys with special composition ratios have abnormally low or constant expansion coefficients, and are called low-expansion alloys. From the earliest commercial low-expansion Fe-Ni alloy (Fe-36%Ni, Invar alloy), Fe-Ni-Co (international alloy designation IN9XX, domestic alloy designation GH9XX) series low-expansion alloys, to Ni-Co-Fe series low-expans...
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IPC IPC(8): B21J1/00B21J5/00B21J1/06C22F1/10C22C19/05
CPCB21J1/003B21J5/002B21J1/06C22F1/10C22C19/057
Inventor 张华邹朝江王攀智宋捷覃允亭项春花杨旭杨家典
Owner GUIZHOU AVIATION TECHN DEV