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Nickel base alloy composition matching and delta-phase spheroidizing heat treatment process

A nickel-based alloy and process technology, applied in the field of nickel-based alloy composition ratio and delta phase spheroidization heat treatment process, can solve problems such as cracking, easy occurrence of coarse grains, mixed crystals, etc., to improve strength, reduce crack growth rate, Effect of improving fatigue life

Inactive Publication Date: 2015-07-29
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The microstructure of large nickel-based alloys with complex shapes is extremely sensitive to the hot working process, which leads to defects such as coarse grains, mixed grains, and cracks in the hot forging of large forgings.

Method used

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Examples

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Embodiment 1

[0016] Embodiment 1: a nickel-based alloy composition ratio and delta phase spheroidization heat treatment process, comprising the following steps:

[0017] (1) Optimizing the distribution ratio of chemical components to select more suitable alloy components to obtain good mechanical properties, and trial-produce nickel-based alloy cylindrical forged rods. This trial-manufacturing method is a commonly used method in the existing relevant fields, and is a publicly known content, so it will not be described in detail;

[0018] (2) Solid solution treatment of nickel-based alloy cylindrical forged rods at 1100° C. for 1 to 1.5 hours, and then water-cooled to room temperature;

[0019] (3) Carry out heat treatment to the nickel-based alloy cylindrical forged rod that has completed step (2). The heat treatment process is: heat preservation at 885°C for 5 hours, then heat preservation at 900°C for 4.5 to 5 hours, and finally rapid cooling under the protection of vacuum argon;

[002...

Embodiment 2

[0024] Embodiment 2: In step (3), the heat treatment process can also be heat preservation at 915° C. for 3 hours, then heat preservation at 930° C. for 2 hours, and finally rapid cooling under vacuum argon protection. All the other are with embodiment 1.

[0025] Wherein the composition of the nickel-based alloy cylindrical forged rod in embodiment 1 and embodiment 2 can also be (w t %): Ni is 0.53-0.55, Cr is 0.17-0.18, Nb: 0.05-0.06, Mo is 0.03-0.04, C is 0.002-0.003; Ti is 0.006-0.007, Al is 0.005-0.008, Zr: 0.004-0.005 , B is 0.0003-0.0004, Si is 0.0003-0.0005, Co is 0.001-0.002, and the rest is Fe. All the other are with embodiment 1 or embodiment 2.

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PUM

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Abstract

The invention discloses a nickel base alloy composition matching and delta-phase spheroidizing heat treatment process which comprises the following steps: (1), carrying out solution treatment on nickel base alloy cylindrical forged rods at 1100 DEG C for 1-1.5 h, and water-cooling to room temperature; (2), carrying out heat treatment on the nickel base alloy cylindrical forged rods treated in the step (1), wherein the heat treatment process comprises the steps that keeping heat for 5 h at 885 DEG C, keeping heat for 4.5-5 h at 900 DEG C and rapidly cooling under vacuum argon protection; (3), after the nickel base alloy cylindrical forged rods treated through the step (2) are cooled to room temperature, cutting the nickel base alloy cylindrical forged rods into required shapes. According to the invention, the strength of the nickel base alloy is improved further, the crack propagation rate of the nickel base alloy is reduced and the fatigue life is prolonged.

Description

Technical field: [0001] The invention relates to the technical field of superalloy materials, and more specifically relates to a nickel-based alloy composition ratio and delta phase spheroidization heat treatment process. Background technique: [0002] Because nickel-based alloys still have excellent comprehensive mechanical properties at high temperatures exceeding 600 °C, they have become materials for key hot-end parts in my country's aviation and aerospace engines, and their consumption accounts for more than 50% of the total output of superalloys. [0003] The microstructure of large nickel-based alloys with complex shapes is extremely sensitive to the hot working process, which leads to defects such as coarse grains, mixed grains, and cracks in the hot forging of large forgings. [0004] Studies have shown that the precipitation of δ phase can effectively hinder the initiation and propagation of cracks in nickel-based alloys and improve the strength of the alloys. Whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C22C38/54
Inventor 吴继华张新华何绍木
Owner SHAOXING UNIVERSITY
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