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Thermodynamic calculation method for optimizing high-temperature brazing process of high-nitrogen steel

A technology of brazing process and calculation method, which is applied in the thermodynamic calculation field of optimizing the high-temperature brazing process of high-nitrogen steel, and can solve problems affecting pitting corrosion resistance and intergranular corrosion performance, reducing material plasticity and toughness, and affecting material properties, etc.

Active Publication Date: 2020-10-30
HARBIN INST OF TECH
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Problems solved by technology

The precipitation of carbonitrides in steel will seriously affect the performance of the material, not only will significantly reduce the plastic toughness of the material, but also affect its own resistance to pitting corrosion and intergranular corrosion

Method used

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  • Thermodynamic calculation method for optimizing high-temperature brazing process of high-nitrogen steel
  • Thermodynamic calculation method for optimizing high-temperature brazing process of high-nitrogen steel
  • Thermodynamic calculation method for optimizing high-temperature brazing process of high-nitrogen steel

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specific Embodiment approach 1

[0035] Specific implementation mode one: a kind of thermodynamic calculation method of optimizing high-nitrogen steel high-temperature brazing process of this embodiment is carried out according to the following steps:

[0036] Step 1: Use the thermodynamic calculation software Jmat Pro to calculate the equilibrium phase diagram of the high-nitrogen steel precipitates based on the CALPHAD calculation method, thereby obtaining the precipitation temperature range of the high-nitrogen steel precipitates;

[0037] Step 2: Use the thermodynamic calculation software Jmat Pro to calculate the isothermal cooling transition curve and continuous cooling transition curve of high nitrogen steel according to the nucleation kinetic equation Johnson-Mehl-Arvami, and obtain the sensitive precipitation of high nitrogen steel precipitates from the isothermal cooling transition curve Temperature range and incubation period, the minimum cooling rate when the high-nitrogen steel precipitates start ...

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Abstract

The invention discloses a thermodynamic calculation method for optimizing a high-temperature brazing process of high-nitrogen steel, and belongs to the field of high-nitrogen austenitic stainless steel brazing. The invention aims to research the influence of precipitated phase of high-nitrogen and ultrahigh-nitrogen stainless steel on the performance of a material in the brazing process so as to optimize the high-nitrogen steel brazing process. According to the method provided by the invention, thermodynamic calculation software Jmat Pro is used, calculation is carried out based on a CALPHAD calculation method to obtain an equilibrium phase diagram of a high-nitrogen steel precipitated phase, and a precipitation temperature range of a high-nitrogen steel precipitated phase is obtained; then, an isothermal cooling transformation curve and a continuous cooling transformation curve of the high-nitrogen steel are calculated according to a nucleation kinetics equation Johnson-Mehl-Arvami; and finally, a sensitive precipitation temperature interval and an inoculation period of the precipitated phase of the high-nitrogen steel are obtained according to the isothermal cooling transformation curve, and brazing is prevented from being carried out in the temperature interval. The invention provides a stable calculation method for determining the optimal brazing parameters of the high-temperature brazing process of the high-nitrogen steel.

Description

technical field [0001] The invention belongs to the field of high-nitrogen austenitic stainless steel brazing, and in particular relates to a thermodynamic calculation method for optimizing a high-nitrogen steel high-temperature brazing process. Background technique [0002] Regarding the definition of high-nitrogen steel, it is generally believed that the steel with nitrogen content greater than 0.4% in the austenite matrix (mass percentage) or greater than 0.08% in the ferrite matrix is ​​called high-nitrogen steel. Due to the shortage of resources, many scholars have proposed to use nitrogen instead of nickel to austenitize the structure. In austenite, nitrogen is easier to dissolve than carbon, and can reduce the precipitation of carbides, improve the strength and durability of steel. corrosion. With the development of high-nitrogen steel, some outstanding advantages of this steel type have been found, such as high strength, good toughness, good process performance and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20B23K1/00G06F119/08G06F119/14
CPCB23K1/00G06F30/20G06F2119/08G06F2119/14
Inventor 何鹏张墅野王星星
Owner HARBIN INST OF TECH
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