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Method for improving resistant property of ferrite/martensite heat resistant steel for high-temperature water vapour oxidation

A technology of heat-resistant steel and martensite, which is applied in the field of steam oxidation resistance of ferrite/martensitic heat-resistant steel, can solve the problem of inability to form a protective film, and achieve the effect of improving the high-temperature water vapor oxidation resistance

Inactive Publication Date: 2012-06-27
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Method for improving resistant property of ferrite/martensite heat resistant steel for high-temperature water vapour oxidation

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] The present invention can realize the rapid heating of material surface through the irradiation of laser beam (heating rate can reach 10 3 -10 7 ℃ / s) and rapid cooling (cooling rate can reach 10 3 ℃ / s or more). For ferritic / martensitic heat-resistant steel, if the heating power is high enough, the laser irradiation can make the surface of the material reach the upper critical temperature (A C3 ) above, the surface structure of the workpiece undergoes austenite transformation, and the austenite transformation is completed in a short period of time in the high-temperature region with high superheat, and the critical radius of the transformation nucleus is small, which can nucleate at the original grain boundary and sub-grain boundary, It can also nucleate at the phase interface and other crystal defects, and the number of nuclei is large, while the wo...

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Abstract

The invention relates to a method to improve the anti-oxidation performance in high temperature steam atmosphere of ferrite / martensite refractory steel, which is characterized in that: the surface of ferrite / martensite refractory steel is conducted laser surface phase transition heat treatment; the properties of quick heating and quick cooling of laser phase transition heat treatment is utilized to form the steel surface into a fine-grain region with the grain size smaller than 25 Mum; the drawbacks of high-density grain boundary, sub-boundary, dislocation and vacancy in the treatment layer are utilized to promote the diffusion of elements such as Cr to oxidation surface from the base, thus improving the anti-oxidation performance in high temperature steam atmosphere.

Description

technical field [0001] The invention relates to a method for improving the steam oxidation resistance of ferrite / martensitic heat-resistant steel used in water vapor or mixed atmosphere flow parts containing water vapor in the fields of thermal power plants, chemical industry, fuel cells and the like. Background technique [0002] Ferritic / martensitic heat-resistant steel has good process performance, thermal strength, low thermal expansion coefficient, high thermal conductivity and lower cost than austenitic heat-resistant steel. It is widely used in thermal power plants, nuclear power plants and chemical plants. , Fuel cell devices, etc. are widely used, especially some thick-walled parts cannot be replaced by austenitic heat-resistant steel. Ferritic / martensitic heat-resistant steel can be divided into two categories: low-alloy heat-resistant steel and 9-12% Cr martensitic heat-resistant steel (the actual Cr content ranges between 8wt% and 13wt%). The Cr content is highe...

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