Heat treatment method for improving mechanical property of GH738 bolt type products

A technology of GH738 and heat treatment method, which is applied in the field of heat treatment to improve the mechanical properties of GH738 bolt products, and can solve the problems that the mechanical properties of GH738 bolt products cannot be satisfied.

Inactive Publication Date: 2019-02-05
GUIZHOU AEROSPACE PRECISION PRODS
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Problems solved by technology

[0003] In view of the problems existing in the background technology, the purpose of the present invention is to provide a heat treatment method to solve the technical problem that the mechanical properties of GH738 bolt products cannot be satisfied by conventional heat treatment, and to greatly improve the mechanical properties of GH738 bolts under the premise of ensuring that the grain size is qualified. The mechanical properties of bolt products, so as to ensure the tensile performance, stress fracture performance and safety of use of bolts, specifically a heat treatment method to improve the mechanical properties of GH738 bolt products

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  • Heat treatment method for improving mechanical property of GH738 bolt type products

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Embodiment

[0023] This embodiment is a processing technology for GH738 bolt products used on a kind of aero-engine. When processing the existing GH738 bolts, solid solution materials are selected to carry out head forming and heading, such as figure 1 As shown, then carry out stabilization treatment, then through machining, thread rolling, rolling R, and finally aging treatment after being processed into a product. Using the existing processing method, its tensile strength and high temperature durability are not ideal.

[0024] In order to improve the mechanical properties of GH738 bolt products, after the stabilization treatment, an aging treatment is carried out, and then the second aging treatment is added. The specific processing steps are: select solid solution materials and perform head forming and heading, Such as figure 1As shown, and then carry out stabilization treatment, the process parameters of the stabilization treatment are as follows: put into the furnace at room temperat...

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Abstract

The invention discloses a heat treatment method for improving mechanical property of GH738 bolt type products. The GH738 bolt type products are subjected to head molding and heading through a solid solution state material, then stabilizing treatment is conducted, then primary aging treatment is conducted, then secondary aging treatment is conducted, and thus heat treatment of the GH738 bolt type products is finished. During secondary aging treatment, much more high-density gamma' strengthening phases are separated out, so that much more gamma' strengthening phases with smaller size and large degree of dispersion and much more carbide are obtained, the alloy is strengthen sufficiently, and accordingly the mechanical property of the GH738 bolt type products is improved. By the adoption of the heat treatment method, the technical problem that the mechanical property usually cannot meet the requirements in ordinary heat treatment production is solved, and the prepared GH738 bolt type products can be applied and popularized in the field of aero-engines.

Description

technical field [0001] The invention relates to the technical field of heat treatment technology for aero-engine GH738 bolt products in mechanical parts, in particular to a heat treatment method for improving the mechanical properties of GH738 bolt products. Background technique [0002] GH738 is a nickel-based superalloy that is precipitation-hardened by the γ′ phase. This alloy is widely used in aero-engines and gas turbines abroad. It is mainly used as rotating parts such as turbine blades and turbine disks. It has mature experience in use. Due to the high cobalt content of this alloy, it is rarely used in China. GH738 is equivalent to the American Waspaloy superalloy. The material has good gas corrosion resistance, high yield strength and fatigue energy below 815°C, good process plasticity and stable structure. In China, this alloy has been used more and more widely in the aviation field, and is suitable for manufacturing aero-engine rotating parts that work for a long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/18C21D1/773
CPCC21D1/18C21D1/773C21D9/0093
Inventor 王运兰樊开伦戴爱丽裴烈勇刘勇德徐韬
Owner GUIZHOU AEROSPACE PRECISION PRODS
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