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Method for accelerating sigma phase nucleation and growth of high-carbon austenitic heat-resistant steel

A technology of austenitic heat-resistant steel and high carbon, which is used in the field of accelerating the nucleation and growth of sigma phase in high-carbon austenitic heat-resistant steel. mechanism and other issues, to prevent the decline of creep resistance and corrosion resistance, reduce casualties and social and economic losses, and accelerate nucleation and growth.

Pending Publication Date: 2021-11-12
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, because the microscopic behavior mechanism of sigma phase is not yet clear, it is usually difficult to obtain research samples containing early sigma phase in a short period of time in related technologies, and sigma phase can only be studied from decommissioned or invalid austenitic heat-resistant steel, but At this time, it is impossible to understand the mechanism of sigma phase precipitation behavior in depth

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  • Method for accelerating sigma phase nucleation and growth of high-carbon austenitic heat-resistant steel
  • Method for accelerating sigma phase nucleation and growth of high-carbon austenitic heat-resistant steel
  • Method for accelerating sigma phase nucleation and growth of high-carbon austenitic heat-resistant steel

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Embodiment 1

[0057] This embodiment is a method for accelerating the nucleation and growth of the sigma phase of high-carbon austenitic heat-resistant steel, comprising the following steps:

[0058]S1. Select heat treatment equipment: high temperature box-type industrial resistance furnace and cooling water tank;

[0059] S2. Select a high-efficiency shot blasting machine with a range of 0.8Mpa and a stainless steel ball with a diameter of 0.6mm;

[0060] S3, polishing:

[0061] Cut a flat square sample from the supplied Super304H heat-resistant steel, and the sample size is 45mm (length) × 28mm (width) × 5mm (height). Then use 200 mesh sandpaper to grind the cut square sample. During the grinding process, let water flow through the sandpaper to cool down. Grind until the surface of the square sample has no obvious changes. Continue to replace 320 mesh, 500 mesh, 800 mesh and 2000 mesh. Sandpaper does the same. Then use 5000-mesh diamond grinding paste to polish the ground sample to a f...

Embodiment 2

[0067] This embodiment is a method for accelerating the nucleation and growth of the sigma phase of high-carbon austenitic heat-resistant steel, comprising the following steps:

[0068] The difference between this embodiment and embodiment 1 is:

[0069] S5. Aging treatment:

[0070] Heat the high-temperature box-type industrial resistance furnace to 650°C, put the nano-surface sample into the effective heating zone of the resistance furnace, and heat and hold it for 168 hours to obtain the aging-treated sample; then immerse the aging-treated sample in a water tank for rapid cooling , to obtain 0.6Mpa-14min nanometerization + 650°C-168h aging treatment sample.

Embodiment 3

[0072] This embodiment is a method for accelerating the nucleation and growth of the sigma phase of high-carbon austenitic heat-resistant steel, comprising the following steps:

[0073] The difference between this embodiment and embodiment 2 is:

[0074] S5. Aging treatment:

[0075] Heat the high-temperature box-type industrial resistance furnace to 620°C, put the nano-surface sample into the effective heating zone of the resistance furnace, and heat and hold for 168 hours to obtain the sample after aging treatment; then immerse the sample after aging treatment in a water tank for rapid cooling , to obtain 0.6Mpa-14min nanometerization + 620°C-168h aging treatment sample.

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Abstract

The invention discloses a method for accelerating sigma phase nucleation and growth of high-carbon austenitic heat-resistant steel. The method comprises the following steps of S1, performing shot blasting treatment on the high-carbon austenitic heat-resistant steel to form a plastic deformation layer on the surface; S2, performing aging treatment and water cooling on the sample treated in the step S1; wherein the temperature of the aging treatment ranges from 620 DEG C to 680 DEG C; and the time of the aging treatment is 12 to 240 hours. According to the method, a nanocrystalline structure with a supercritical saturation deformation value is prepared on the surface of the sample through a surface nanocrystallization technology, finally, the severe plastic deformation nano-layer sample with a certain thickness is subjected to aging treatment at a specific temperature, so that nucleation and growth of a sigma phase of the high-carbon austenitic heat-resistant steel are remarkably accelerated, the problem that the sigma phase early-stage sample is difficult to obtain is solved, and in-depth research and understanding of the sigma phase microscopic behavior mechanism are facilitated.

Description

technical field [0001] The invention relates to the field of failure and protection of austenitic heat-resistant steel, in particular to a method for accelerating the nucleation and growth of sigma phase in high-carbon austenitic heat-resistant steel. Background technique [0002] Thermal power generation accounts for more than 70% of my country's power generation distribution, occupying a dominant position in the energy structure. The development of advanced thermal power units can not only improve the efficiency of thermal power generation, but also help to improve the current environmental pollution problems, which is an inevitable trend in the development of thermal power technology. Because high-carbon austenitic heat-resistant steel has excellent high-temperature mechanical properties and structural stability, it has become an important manufacturing material for supercritical thermal power unit parts in my country in recent years. Under high temperature service, the ...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C38/02C22C38/04C22C38/48C22C38/44C22C38/42
CPCC21D8/005C21D2201/03C21D2211/001C21D2211/008C22C38/02C22C38/04C22C38/48C22C38/44C22C38/42
Inventor 王锐坤蔡伟龙
Owner GUANGZHOU UNIVERSITY
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