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Thermal treatment process of Invar alloy

A technology of heat treatment furnace and process, which is applied in the field of heat treatment process of Invar alloy, can solve the problems that are not obvious, and achieve the effect of improving effect, convenient and practical heat treatment process, and reasonable treatment process

Active Publication Date: 2014-01-29
SHENZHEN XINTIAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will work well for common metal materials, but for the specificity of materials such as Invar alloy, it is not obvious

Method used

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  • Thermal treatment process of Invar alloy

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Embodiment

[0018] The principle diagram of the present invention is as figure 1 As shown, the heat treatment process of the Invar alloy of the present invention adopts a gradient cyclic annealing stress relief process, which specifically includes the following steps:

[0019] 1) Put the workpiece into a heat treatment furnace at 250°C to 400°C for 1.5 hours to 2.5 hours;

[0020] 2) Take the workpiece out of the heat treatment furnace and cool it to room temperature under air;

[0021] 3) Place the workpiece in a heat treatment furnace at 80°C to 120°C for 1.5 hours to 2.5 hours;

[0022] 4) Then place the workpiece in a cold furnace at -30°C to -50°C for 1.5 hours to 2.5 hours;

[0023] 5) Place the workpiece in a heat treatment furnace at 80°C to 120°C for 1.5 hours to 2.5 hours;

[0024] 6) Take the workpiece out of the heat treatment furnace and cool it to room temperature under air.

[0025] In this embodiment, the above step 1) put the workpiece into a heat treatment furnace at...

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Abstract

The invention discloses a thermal treatment process of an invar alloy. A gradient circular annealing de-stressing process is adopted and comprises the following steps of: 1) putting a work-piece in a thermal treatment furnace at a temperature of 250-400 DEG C and retaining for 1.5-2.5h; 2) taking the work-piece out of the thermal treatment furnace and cooling the work-piece in the air to the normal temperature; 3) putting the work-piece in the thermal treatment furnace at a temperature of 80-120 DEG C and retaining for 1.5-2.5h again; 4) putting the work-piece in a cooling furnace at a temperature of -50 to -30 DEG C and retaining for 1.5-2.5h again; 5) putting the work-piece in the thermal treatment furnace at a temperature of 80-120 DEG C and retaining for 1.5-2.5h again; and 6) taking the work-piece out of the thermal treatment furnace and cooling the work-piece in the air to the normal temperature. Through the adoption of the gradient circular annealing de-stressing process, the de-stressing effect is obviously enhanced. The thermal treatment process of the invar alloy is applied to key parts and components of a resonant cavity in a communication device, so that the adverse influence on the signal processing due to the temperature change is greatly reduced. The treatment process disclosed by the invention is reasonable in process, convenient and practical.

Description

technical field [0001] The invention relates to a heat treatment process of Invar alloy, which belongs to the modification technology of the heat treatment process of Invar alloy. Background technique [0002] Invar alloy, also referred to as Invar alloy for short, is an iron alloy containing 35.4% nickel. It has a very low coefficient of thermal expansion at room temperature (between -20°C and 20°C, the average value is about 1.6×10-6 / °C), good Excellent dimensional stability and easy degaussing characteristics. From room temperature to 100°C, the thermal expansion coefficient of the alloy is about 1.1x10-6 / °C, which is only 1 / 10 of that of aluminum-killed steel (ie AK material). The volume does not change in the temperature range of 350 °C. Invar alloy, known as the king of metals, is an indispensable structural material for precision instruments and equipment. Since Invar alloy is a special material, it is difficult to completely eliminate its internal stress by tradit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C21D1/26C22C38/08
Inventor 石伟平韩明光
Owner SHENZHEN XINTIAN TECH