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A method for improving the high temperature water vapor oxidation resistance of heat-resistant steel

A heat-resistant steel, water vapor technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as the inability to generate protective films

Inactive Publication Date: 2012-02-15
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
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Problems solved by technology

However, only when the Cr content in the base metal is higher than about 22.5% can a complete protective Cr 2 o 3 , when the Cr content is low, a stable protective film cannot be formed

Method used

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  • A method for improving the high temperature water vapor oxidation resistance of heat-resistant steel
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  • A method for improving the high temperature water vapor oxidation resistance of heat-resistant steel

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] In the present invention, the surface of the heat-resistant steel to be treated is subjected to laser surface remelting treatment, so that the surface layer of the heat-resistant steel is 10 3 ~10 7 ℃ / s above the rate of heating and melting, and then 10 3 The cooling rate above ℃ / s solidifies, and a fine-grained region with a grain size below 25 μm is formed on the surface of the heat-resistant steel. The resistance to high temperature water vapor oxidation is improved through defects such as high-density grain boundaries, subgrain boundaries, dislocations, and vacancies of the treatment layer.

[0026] In order to further improve the steam oxidation resistance of the laser remelted layer on the heat-resistant steel surface, a coating containing Cr, Al or Si elements is formed on the heat-resistant steel surface by pretreatment before the laser surfa...

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Abstract

A method for improving the high-temperature water vapor oxidation resistance of heat-resistant steel. The surface of the heat-resistant steel to be treated is subjected to laser surface remelting treatment, so that the surface layer of the heat-resistant steel is heated to above the melting point at a rate of 103°C / s and melted, and then Solidify at a cooling rate above 103°C / s, and use the characteristics of rapid heating and rapid cooling of laser surface remelting to form a microcrystalline region with a grain size of less than 25 μm on the surface of the steel, through the high-density grain boundaries and subgrains of the treated layer Lattice defects such as grain boundaries, twin boundaries, dislocations, and vacancies promote the diffusion of elements such as Cr and Si to improve the resistance to high temperature water vapor oxidation.

Description

technical field [0001] The invention relates to a method for improving the anti-high temperature water vapor oxidation performance of water vapor or a mixed atmosphere containing water vapor in the fields of thermal power plants, chemical industry, fuel cells, etc., in particular to a method for improving the high temperature resistance of heat-resistant steel Methods for water vapor oxidation properties. Background technique [0002] In the field of thermal power generation, as people pay more and more attention to energy conservation and environmental protection, the parameters of the unit are continuously improved to improve unit efficiency and reduce pollutant emissions per unit of power generation. However, with the increase of steam parameters, especially the steam temperature, a large number of high-temperature steam components in the unit, such as superheaters, reheaters, high-temperature steam pipes, turbine rotors, blades, high- and high-pressure internal cylinders...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D10/00C21D11/00
Inventor 周荣灿唐丽英王弘喆张红军于在松
Owner XIAN THERMAL POWER RES INST CO LTD
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