A Method for Improving Nitriding Layer Structure of 1cr13 Steel Membrane Lid Parts

Abstract

The invention provides a method of improving the organization of a nitride layer of a 1Cr13 steel membrane cover closing part. The method is characterized by comprising the following steps that (1) the examination is conducted, wherein the working procedure examination is conducted on a received part; (2) vacuum denitrification is conducted, wherein the intensity of the pressure of a vacuum chamber is equal to 6.7*10<-2>Pa through pumping before heating is conducted, heating and heat preservation are conducted for a certain period of time, the intensity of the pressure of the vacuum chamber issmaller than or equal to 6.7*10<-2>Pa in the heating and heat preservation process, the vacuum chamber is filled with argon after heat preservation is finished, and the part is discharged after the temperature of the part is reduced to 80 DEG C or below; and (3) testing is conducted, wherein the organization and the hardness of an infiltrated layer are examined. The method of improving the organization of the nitride layer of the 1Cr13 steel membrane cover closing part has the advantages that existing net-shaped or vein-shaped nitrides in the nitride layer can be decomposed on the premise that the mechanical properties of a material are not reduced, nitrogen elements can diffuse towards a matrix, the purpose that the number of the net-shaped or vein-shaped nitrides in the infiltrated layer of the part is reduced is achieved, the hardness of the part processed through denitrification meets the requirement that HR15N is larger than or equal to 88, and the method can serve as a remedialmeasure conducted after a defect exists.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular provides a process method for reducing the network or vein-like nitrides in the nitride layer of 1Cr13 steel membrane lid parts. Background technique [0002] 1Cr13 martensitic-ferritic stainless steel can not only obtain better strength and toughness after quenching and tempering and nitriding treatment, but also significantly improve the hardness, wear resistance, fatigue strength and thermal stability of the working surface. Used as nitrided parts. However, due to factors such as process, equipment or operation, network or vein nitrides appear in the nitrided layer, which makes the nitrided parts brittle and the structure of the nitrided layer does not meet the rating standards or inspection requirements. [0003] At present, the existing technology can only improve the network or vein-like nitrides of the nitrided layer of structural steel, and cannot effectively imp...

AI Technical Summary

Problems solved by technology

However, due to factors such as process, equipment or operation, network or vein nitrides appear in the nitrided layer, which makes the nitrided parts brittle and the structure of the nitrided layer does not meet the rating standards or inspection requirements.

[0003] At present, the existing technology can only improve the network or vein nitrides of the nitrided layer of structural steel, and cannot effectively improve the morphology and distribution of nitrides.

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