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A carburizing method for suppressing reticular carbide structure of high chromium and high cobalt carburizing steel and increasing carburizing speed

A network carbide and carburizing steel technology, which is applied in the direction of liquid chemical plating, solid diffusion coating, vacuum evaporation plating, etc., can solve the problems of poor fatigue resistance and high material brittleness, so as to improve carburizing speed, Effect of reducing production cost and shortening carburizing heat treatment time

Active Publication Date: 2020-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problem that the existing high-chromium and high-cobalt carburizing steel is prone to reticular carbide structure, resulting in high brittleness and poor fatigue resistance of the material, and proposes a method for inhibiting reticular carbonization of high-chromium and high-cobalt carburizing steel A carburizing method that improves the carburizing speed

Method used

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  • A carburizing method for suppressing reticular carbide structure of high chromium and high cobalt carburizing steel and increasing carburizing speed
  • A carburizing method for suppressing reticular carbide structure of high chromium and high cobalt carburizing steel and increasing carburizing speed
  • A carburizing method for suppressing reticular carbide structure of high chromium and high cobalt carburizing steel and increasing carburizing speed

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specific Embodiment approach 1

[0025] Specific embodiment one: present embodiment is a kind of carburizing method that suppresses reticular carbide structure of high chromium and high cobalt carburizing steel and improves carburizing speed, specifically carries out according to the following steps:

[0026] 1. Coating: Coating a metal film on the surface of high chromium and high cobalt carburizing steel, controlling the thickness of the metal film to be 1 μm to 50 μm to obtain a coated workpiece;

[0027] 2. Carburizing: use vacuum pulse carburizing technology to carburize the coated workpiece obtained in step 1, and control the carburizing temperature at 800°C to 1000°C; complete the inhibition of the reticular carbide structure of high chromium and high cobalt carburizing steel A carburizing method that increases the carburizing speed.

specific Embodiment approach 2

[0028] Embodiment 2: This embodiment differs from Embodiment 1 in that the coating method in step 1 is vacuum evaporation, magnetron sputtering coating, multi-arc ion coating, electroplating or electroless plating. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0029] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the coating process in step one is: adopt the method of direct current electroplating to coat a layer of alloy film on the surface of high chromium and high cobalt carburized steel, wherein the electroplating solution Composition: nickel chloride concentration is 0.2mol / L, nickel sulfate concentration is 0.5mol / L, ferrous sulfate concentration is 0.5mol / L, boric acid concentration is 0.5mol / L, control current density is 10mA / cm 2 . Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a carburizing method capable of inhibiting a high-chromium high-cobalt carburizing steel network carbide structure and increasing the carburizing speed, and relates to the field of material surface heat treatment. The technical problems that a network carbide structure is prone to occurring to existing high-chromium high-cobalt carburizing steel, and thus, a material is high in brittleness and poor in fatigue resistance need to be solved. The method comprises the steps that 1, a metal film is plated on the surface of high-chromium high-cobalt carburizing steel; and 2, the film plated workpiece is subjected to carburizing. Through the carburizing method, a carburizing layer structure of which the carburizing layer is free of the network carbide structure is obtained,and carbide is uniformly distributed in the carburizing layer. The technical problem that the network carbide structure is prone to occurring during high-alloy steel carburizing is solved. The carburizing method is applied to the field of aircraft bearing gears.

Description

technical field [0001] The invention relates to the field of material surface heat treatment. Background technique [0002] With the continuous development of aviation technology, the performance requirements of aero-engines are more stringent, and the requirements for gear and bearing materials are also getting higher and higher. The limit service temperature of M50 high-temperature bearing steel and M50NiL carburized and hardened bearing steel is about 315°C, which cannot meet the application requirements of the next generation of aero-engines. High chromium and high cobalt carburizing steel such as BG801 bearing steel (14Cr14Co13Mo4.7Ni2VW) contains 13wt.% Co element, which can significantly improve the high temperature mechanical properties of the alloy. After carburizing heat treatment, BG801 steel can obtain high surface hardness, good wear resistance, high core toughness, and comprehensive mechanical properties with good strength and toughness under the premise of ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/22C25D3/56C23C14/16C23C18/16
Inventor 尹龙承马欣新
Owner HARBIN INST OF TECH
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