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Surface shot blasting process for improving high temperature steam oxidization resistance of high-chromium austenite steel

An austenitic steel, high temperature resistance technology, applied in the field of shot peening, can solve the problems of limited application range, unfavorable steam oxidation resistance, difficulty in obtaining grain structure, etc., to improve dislocation density and high temperature oxidation resistance. , Improve the effect of anti-oxidative corrosion ability

Inactive Publication Date: 2015-01-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Method (3) can obtain a fine-grained structure by cold working or solution treatment, thereby improving the steam oxidation resistance, but the scope of application of this method is limited, and it is difficult to obtain a uniform grain structure, which is not conducive to uniformly improving the steam resistance of the material Oxidation properties

Method used

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  • Surface shot blasting process for improving high temperature steam oxidization resistance of high-chromium austenite steel
  • Surface shot blasting process for improving high temperature steam oxidization resistance of high-chromium austenite steel
  • Surface shot blasting process for improving high temperature steam oxidization resistance of high-chromium austenite steel

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Embodiment 1

[0026] see figure 1 Shown, a kind of surface shot peening process of improving high-chromium austenitic steel anti-high temperature steam oxidation of the present invention is:

[0027] (1) Adopt mechanical centrifugal shot blasting equipment, which has a projectile size screening and crushing projectile device, and a ventilation and dust removal device.

[0028] (2) Ceramic projectiles are used as shot blasting materials, with a microhardness of 700HV and a diameter of 0.6mm.

[0029] (3) When shot peening is in progress, the distance from the nozzle to the sample surface is 150 mm, the shot peening flow rate is 1.8 kg / min, the shot peening time is 3 min, and the spray angle θ=50°.

[0030] (4) The rotational speed of the centrifugal shot blasting machine is 3500r / min.

[0031] The main organization of the above ceramic projectiles is dense ZrO 2 Crystal phase and SiO 2 Amorphous phase, ZrO 2 The mass percentage of crystal phase is 60%~70%, SiO 2 The mass percentage of ...

Embodiment 2

[0042] A surface shot peening process for improving the high-chromium austenitic steel anti-high temperature steam oxidation of the present invention is as follows:

[0043] (1) Adopt mechanical centrifugal shot blasting equipment, which has a projectile size screening and crushing projectile device, and a ventilation and dust removal device.

[0044] (2) Ceramic projectiles are used as shot blasting materials, with a microhardness of 660HV and a diameter of 0.75mm.

[0045] (3) When shot peening is in progress, the distance from the nozzle to the sample surface is 170 mm, the shot peening flow rate is 2.5 kg / min, the shot peening time is 2 min, and the spray angle θ=40°.

[0046] (4) The rotational speed of the centrifugal shot blasting machine is 4500r / min.

[0047] The main organization of the above ceramic projectiles is dense ZrO 2 Crystal phase and SiO 2 Amorphous phase, ZrO 2 The mass percentage of crystal phase is 60%~70%, SiO 2 The mass percentage of amorphous ph...

Embodiment 3

[0050] A kind of surface shot peening process of the present invention to improve high-chromium austenitic steel anti-high temperature steam oxidation is:

[0051] (1) Adopt mechanical centrifugal shot blasting equipment, which has a projectile size screening and crushing projectile device, and a ventilation and dust removal device.

[0052] (2) Ceramic shot is used as the shot blasting material with a microhardness of 750HV and a diameter of 0.25mm.

[0053] (3) When shot peening is in progress, the distance from the nozzle to the sample surface is 190 mm, the shot peening flow rate is 1.0 kg / min, the shot peening time is 4 min, and the spray angle θ=65°.

[0054] (4) The rotational speed of the centrifugal shot blasting machine is 2500r / min.

[0055] The main organization of the above ceramic projectiles is dense ZrO 2 Crystal phase and SiO 2 Amorphous phase, ZrO 2 The mass percentage of crystal phase is 60%~70%, SiO 2 The mass percentage of amorphous phase is 28%~33%, ...

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Abstract

The invention discloses a surface shot blasting process for improving a high temperature steam oxidization resistance of a high-chromium austenite steel, wherein mechanical centrifugal shot blasting equipment is used for shot blasting; the shot is made of ceramic; microhardness of the shot is 660-750HV, shot diameter is 0.25-0.75mm, a distance from a nozzle to the surface of a test sample is 150-190mm, shot blasting flow is 1.0-2.5kg / min, shot blasting duration is 2-4min and shot blasting angle theta is 40-65 degrees. According to the process disclosed by the invention, a shot blasting strength of 0.25-0.35A and a surface coverage of 200% of the high-chromium austenite steel can be guaranteed; and meanwhile, the oxidizing corrosion resistance of the high-chromium austenite steel in the high-temperature steam is effectively improved, so that the development of high-temperature steam oxidizing protection methods of supercritical and ultra supercritical units is greatly promoted.

Description

technical field [0001] The invention relates to the field of shot peening technology, in particular to a surface shot peening technology for improving the oxidation resistance of high-chromium austenitic steel by high-temperature steam. Background technique [0002] In the field of thermal power generation, as people pay more and more attention to energy conservation and environmental protection, people continue to increase the steam parameters of the unit to improve unit efficiency and reduce pollutant emissions per unit of power generation. With the development of super (super) critical power generation technology, in practical application, the main steam pressure of super (super) critical unit can reach 31MPa, and the main steam temperature can reach 610 ℃. However, while the increase in temperature and pressure brings higher system efficiency, it also makes the failure of high-temperature components of the boiler more prominent, especially the burst tube failure caused b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/06
Inventor 王树众李学东陈林吴志强孟海鱼王龙飞
Owner XI AN JIAOTONG UNIV
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