阅读说明：本技术 一种gh4169高温合金丝材冷变形后的热处理方法 (Heat treatment method for GH4169 high-temperature alloy wire after cold deformation ) 是由 付建辉 周扬 肖东平 赖宇 于 2020-12-03 设计创作，主要内容包括：本发明公开了一种GH4169高温合金丝材冷变形后的热处理方法,属于高温合金丝材制备技术领域,提供一种实现冷拉变形量及热处理工艺的最佳控制的,针对GH4169高温合金丝材的冷变形后的中间热处理方法；具体为将所得到的冷拉态丝材进行固溶热处理,在1000℃～1020℃进行5～20min保温；然后以20℃/min的冷却速率降温至960℃,保温60min；最后充入氩气进行气冷；并且在进行固溶热处理过程中真空度＜10～(-3)Pa。本发明所述方法实现了冷拉状态丝材,根据冷拉变形量及对应热处理温度的最佳控制,从而获得理想的再结晶晶粒和析出相组织,析出相沿晶界析出,起到抑制晶粒长大和强化晶界的作用,满足航空航天紧固件、弹簧丝用GH4169合金丝材的组织性能需求。(The invention discloses a heat treatment method of GH4169 high-temperature alloy wire after cold deformation, belongs to the technical field of high-temperature alloy wire preparation, and provides an intermediate heat treatment method for GH4169 high-temperature alloy wire after cold deformation, which realizes the optimal control of cold-drawing deformation and heat treatment process; specifically, the obtained cold-drawn wire is subjected to solution heat treatment, and the temperature is kept for 5-20 min at 1000-1020 ℃; then cooling to 960 deg.C at a cooling rate of 20 deg.C/min, and maintaining for 60 min; finally, filling argon for air cooling; and the vacuum degree is less than 10 in the process of solution heat treatment ‑3 Pa. The method realizes the optimal control of the wire material in a cold-drawing state according to the cold-drawing deformation and the corresponding heat treatment temperature, thereby obtaining ideal recrystallized grains and precipitated phase structures, precipitating the precipitated phase along the grain boundary, playing the roles of inhibiting the grain growth and strengthening the grain boundary, and meeting the requirements of GH4169 alloy for aerospace fasteners and spring wiresTissue property requirements of the wire.)

1. A heat treatment method of GH4169 high-temperature alloy wire after cold deformation is characterized in that: the method comprises the following steps:

step one, obtaining a cold-drawn wire;

step two, carrying out solution heat treatment on the cold-drawn wire obtained in the step one, and carrying out heat preservation for 5-20 min at 1000-1020 ℃ so as to recrystallize an alloy structure and obtain recrystallized grains with uniform structures; then cooling to 960 ℃ at a cooling rate of 20 ℃/min, and preserving heat for 60min to enable a precipitated phase to be precipitated along a grain boundary; finally, filling argon for air cooling; and the vacuum degree is less than 10 in the process of solution heat treatment^-3Pa。

2. The method for heat treatment of GH4169 superalloy wire after cold deformation of claim 1, wherein: in the first step, the cold-drawn wire is prepared by a cold drawing method or a cold swaging method, wherein the deformation amount of cold drawing or the deformation amount of cold swaging exceeds 30%.

3. The method for heat treatment of GH4169 superalloy wire after cold deformation of claim 2, wherein: wherein the deformation of cold drawing or cold rotary swaging is 30-50%.

4. A method of heat treating a GH4169 superalloy wire after cold deformation as claimed in any of claims 1 to 3, wherein: and the solution heat treatment in the second step adopts a sectional type vacuum heat treatment furnace.

Technical Field

The invention relates to the technical field of preparation of high-temperature alloy wires, in particular to a heat treatment method of GH4169 high-temperature alloy wires after cold deformation.

Background

The GH4169 high-temperature alloy has high tensile strength, durability, good corrosion resistance, high-temperature oxidation resistance, hot working and welding performance, and is widely applied to important structural materials in aerospace and other fields. At present, cold deformation process technology is mainly adopted in the field of manufacturing GH4169 alloy wire materials for fasteners and spring wires, and the domestic GH4169 alloy wire materials have unstable product performance and very low qualification rate. In order to meet different use requirements of strength, fatigue, creep and the like, the cold deformation processing technology of the GH4169 alloy wire is controlled, the cold deformation and the heat treatment in the cold deformation process are the key points for controlling the alloy structure and performance, but at present, the GH4169 alloy has no systematic research on intermediate heat treatment after cold deformation, so that the cold processing technology of the GH4169 alloy is immature.

Disclosure of Invention

The invention aims at providing an intermediate heat treatment method for GH4169 high-temperature alloy wire after cold deformation, which realizes the optimal control of cold-drawing deformation and heat treatment process.

The technical scheme adopted by the invention for solving the technical problems is as follows: a heat treatment method for GH4169 high-temperature alloy wire after cold deformation comprises the following steps:

step one, obtaining a cold-drawn wire;

step two, carrying out solution heat treatment on the cold-drawn wire obtained in the step one, and carrying out heat preservation for 5-20 min at 1000-1020 ℃ so as to recrystallize an alloy structure and obtain recrystallized grains with uniform structures; then cooling to 960 ℃ at a cooling rate of 20 ℃/min, and preserving heat for 60min to enable a precipitated phase to be precipitated along a grain boundary; finally, filling argon for air cooling; and the vacuum degree is less than 10 in the process of solution heat treatment^-3Pa。

Further, the method comprises the following steps: in the first step, the cold-drawn wire is prepared by a cold drawing method or a cold swaging method, wherein the deformation amount of cold drawing or the deformation amount of cold swaging exceeds 30%.

Further, the method comprises the following steps: wherein the deformation of cold drawing or cold rotary swaging is 30-50%.

Further, the method comprises the following steps: and the solution heat treatment in the second step adopts a sectional type vacuum heat treatment furnace.

The invention has the beneficial effects that: the method realizes the optimal control of the wire material in a cold-drawing state according to the cold-drawing deformation and the corresponding heat treatment temperature, thereby obtaining ideal recrystallized grains and precipitated phase structures, and the precipitated phases are precipitated along grain boundaries to play the roles of inhibiting the growth of the grains and strengthening the grain boundaries, and meeting the requirements of the structural properties of GH4169 alloy wire materials for aerospace fasteners and spring wires.

Drawings

FIG. 1 is a schematic view of the structure of a wire prepared in example one;

FIG. 2 is a schematic view of the structure of the wire prepared in example two;

Detailed Description

The invention is further described with reference to the following figures and detailed description.

It should be noted that, if there are directional indication terms, such as the terms of direction and orientation, above, below, left, right, front and back, in the present invention, for facilitating the description of the relative positional relationship between the components, the absolute position that is not the positional relationship between the related components and the components is specifically referred to, and is only used for explaining the relative positional relationship and the motion situation between the components in a specific posture, and if the specific posture is changed, the directional indication is changed accordingly. When the present invention relates to a number, such as "a plurality", "several", etc., two or more than two are specifically referred to.

The invention discloses a heat treatment method of GH4169 high-temperature alloy wire after cold deformation, which comprises the following steps:

step one, obtaining a cold-drawn wire; the wire in the cold drawing state can be prepared by a cold drawing method or a cold rotary swaging method, wherein the deformation of cold drawing or the deformation of cold rotary swaging exceeds 30%, complete recrystallization can be generated at the moment, and the improvement of the deformation is beneficial to refining grains; for example, the specific deformation amount of cold drawing or cold swaging is 30% to 50%.

Step two, carrying out solution heat treatment on the cold-drawn wire obtained in the step one, and carrying out heat preservation for 5-20 min at 1000-1020 ℃ so as to recrystallize an alloy structure and obtain recrystallized grains with uniform structures; then cooling to 960 ℃ at a cooling rate of 20 ℃/min, and preserving heat for 60min to enable a precipitated phase to be precipitated along a grain boundary; finally, filling argon for air cooling; and the vacuum degree is less than 10 in the process of solution heat treatment^-3Pa. The solution heat treatment in the second step may preferably be a sectional vacuum heat treatment furnace.

Detailed description of the preferred embodiment

Step one, obtaining the GH4169 high-temperature alloy wire in a cold-drawing state by adopting a cold-drawing method, wherein the cold-drawing deformation is 40%.

Step two, putting the cold-drawn wire obtained in the step one into a sectional type vacuum heat treatment furnace for solution heat treatment, preserving heat at 1020 ℃ for 20min, then cooling to 960 ℃ at a cooling rate of 20 ℃/min, and preserving heat for 60 min; then filling argon for air cooling; and the vacuum degree is less than 10 in the process of solution heat treatment^-3Pa。

The structure of the obtained alloy wire after heat treatment is shown in figure 1, the alloy structure is uniform, the alloy structure is a deformed and recrystallized structure, a precipitated phase is precipitated along a grain boundary, and the grain size is 8-grade. The structural performance requirements of GH4169 alloy for aerospace fasteners and spring wires are met.

Detailed description of the invention

Step one, obtaining the GH4169 high-temperature alloy wire in a cold-drawing state by adopting a cold-rotary swaging method, wherein the deformation of cold-rotary swaging is 34%.

Step two, placing the cold-drawn wire obtained in the step one in a sectional type vacuum heat treatment furnace for solution heat treatment, preserving heat at 1000 ℃ for 10min, then cooling to 960 ℃ at a cooling rate of 20 ℃/min, preserving heat for 60min, filling argon for air cooling(ii) a And the vacuum degree is less than 10 in the process of solution heat treatment^-3Pa。

The structure of the obtained alloy wire after heat treatment is shown in figure 2, the alloy structure is uniform, the alloy structure is a deformed and recrystallized structure, a precipitated phase is precipitated along a grain boundary, and the grain size is 7 grades. The structural performance requirements of GH4169 alloy for aerospace fasteners and spring wires are met.