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A heat treatment method for improving the mechanical properties of austenitic heat-resistant steel

A technology of austenitic heat-resistant steel and heat treatment method, which is applied in the field of heat treatment, can solve problems such as limited improvement of mechanical properties, and achieve the effect of performance optimization

Active Publication Date: 2019-06-14
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Optimizing the heat treatment process is also an important technical method to improve the service performance of materials. However, in the prior art, the treatment of austenitic heat-resistant steel is to carry out corresponding heat treatment in conjunction with its components, and finally after solution treatment. The whole process is over, there is no other treatment that can improve its performance, and the improvement of mechanical properties is limited

Method used

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  • A heat treatment method for improving the mechanical properties of austenitic heat-resistant steel
  • A heat treatment method for improving the mechanical properties of austenitic heat-resistant steel
  • A heat treatment method for improving the mechanical properties of austenitic heat-resistant steel

Examples

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Effect test

example 1

[0025] The invention discloses a heat treatment method for improving the mechanical properties of austenitic heat-resistant steel, which uses a solution treatment process combined with a medium-temperature short-term aging treatment to precipitate fine M 23 C 6 phase and nano-sized Z phase (NbCrN phase) to optimize the performance of heat-resistant steel. The comparison between the chemical composition of the austenitic heat-resistant steel obtained in this example and the existing HR3C steel is shown in Table 1.

[0026] Table 1 Chemical composition (mass %, balance is Fe) of austenitic heat-resistant steel (1#) and comparative example (HR3C steel) used in Example 1.

[0027]

[0028] The present invention is a heat treatment method for improving the mechanical properties of austenitic heat-resistant steel, the steps are as follows:

[0029] 1. Heat the alloy sample that has been homogenized and thermally deformed in sequence to 1230°C, keep it warm for 30 minutes for so...

example 2

[0040] A heat treatment method for improving the mechanical properties of austenitic heat-resistant steel, comprising the steps of,

[0041] Step 1. Raw materials are prepared according to the alloy composition and burning loss, and the raw materials are melted and cast into alloy ingots in a vacuum environment;

[0042] Step 2, the alloy ingot is subjected to homogenization and thermal deformation treatment in sequence;

[0043] Step 3, performing solution heat treatment on the hot-deformed alloy at 1200°C for 45 minutes, and then water-cooling to room temperature;

[0044] Step 4, short-term aging treatment at medium temperature: heat the alloy after solution heat treatment to 800°C, hold it for 30 minutes, and cool it to room temperature in air. get M 23 C 6 Mutually.

[0045] In this preferred example, the alloy ingot is homogenized at 1150° C. for 30 hours. The homogenized alloy ingot is subjected to heat deformation treatment at 1150°C.

example 3

[0047] A heat treatment method for improving the mechanical properties of austenitic heat-resistant steel, comprising the steps of,

[0048] Step 1. Raw materials are prepared according to the alloy composition and burning loss, and the raw materials are melted and cast into alloy ingots in a vacuum environment;

[0049] Step 2, the alloy ingot is subjected to homogenization and thermal deformation treatment in sequence;

[0050] Step 3, performing solution heat treatment on the hot-deformed alloy at 1260° C. for 35 minutes, and then water-cooling to room temperature;

[0051] Step 4, short-term aging treatment at medium temperature: heat the alloy after solution heat treatment to 760°C, hold it for 40 minutes, and cool it to room temperature in air. get M 23 C 6 Mutually.

[0052] In this preferred example, the alloy ingot is homogenized at 1200° C. for 20 hours. The homogenized alloy ingot is subjected to heat deformation treatment at 1150°C.

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Abstract

The invention provides a heat treatment method for improving the mechanical property of austenitic heat-resistance steel. According to the heat treatment method, the technological step is simple and effective, operation is easy, cost is low, the microstructure of the austenitic heat-resistance steel can be improved, and the mechanical property of austenitic heat-resistance steel is improved. The heat treatment method comprises the following steps that (1) raw materials are prepared according to the alloy component and the burned value and smelted and poured into alloy ingots under the vacuum environment; (2) the alloy ingots are sequentially subjected to homogenization and heat deforming treatment; (3) alloys after heating deforming are subjected to solid solution heat treatment at the temperature of 1200-1260 DEG C for 25-45 min, and then water cooling is conducted till the temperature reaches the indoor temperature; and (4) intermediate temperate short-term aging treatment is conducted, specifically, the alloys after solid solution heat treatment are heated till the temperature is 750-800 DEG C, heat preservation is conducted for 30-60 min, air cooling is conducted till the temperature reaches the indoor temperature, the austenitic heat-resistance steel is obtained, nano-scale Z phases are obtained in crystals, and M23C6 phases are obtained in crystal boundaries.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a heat treatment method for improving the mechanical properties of austenitic heat-resistant steel. Background technique [0002] With the continuous development of the domestic economy, the demand for energy is increasing day by day, and the awareness of protecting the natural environment is also increasing. my country is rich in coal resources, and thermal power will occupy a dominant position in my country's energy structure for a long time. In the field of coal-fired power generation, increasing the temperature and pressure of steam can effectively improve thermal efficiency, save coal consumption, and reduce SO 2 , NO x and CO 2 and other harmful gas emissions to achieve environmental friendliness. [0003] The continuous improvement of the parameters of thermal power units has also put forward more stringent requirements for the performance of materials. In 600°...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D8/00C21D6/00C22C38/52C22C38/04C22C38/02C22C38/54C22C38/48C22C38/46
CPCC21D1/18C21D6/004C21D6/005C21D6/007C21D6/008C21D8/005C21D2211/001C21D2211/004C22C38/001C22C38/005C22C38/02C22C38/04C22C38/46C22C38/48C22C38/52C22C38/54
Inventor 朱传志袁勇尹宏飞党莹樱赵新宝严靖博杨珍鲁金涛周永莉黄锦阳
Owner HUANENG POWER INT INC
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