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Composite carburizing and quenching heat treatment method of gear

A heat treatment method and compound infiltration technology, applied in the field of heat treatment, can solve the problems of reducing wear resistance, toughness and comprehensive mechanical properties of gears, low surface hardness of gears, and high austenite content, so as to improve comprehensive mechanical properties and improve Wear resistance, effect of refining martensitic needles

Active Publication Date: 2016-01-13
CRRC QISHUYAN INSTITUTE CO LTD
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Problems solved by technology

[0004] Although this method can effectively reduce the internal oxidation of the gear and reduce the deformation of the gear, and improve the contact fatigue performance of the gear, in-depth research shows that there are the following deficiencies: after carburizing and quenching, the martensite needles on the surface layer are relatively coarse, and the retained austenite content is relatively large. Too much, the surface hardness of the gear is low, thus reducing the wear resistance, toughness and comprehensive mechanical properties of the gear

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  • Composite carburizing and quenching heat treatment method of gear
  • Composite carburizing and quenching heat treatment method of gear
  • Composite carburizing and quenching heat treatment method of gear

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[0039] Objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments. These embodiments are only typical examples of applying the technical solutions of the present invention, and all technical solutions formed by adopting equivalent replacements or equivalent transformations fall within the protection scope of the present invention.

[0040] The compound carburizing and quenching heat treatment method of a kind of locomotive traction gear disclosed in this embodiment is as follows: figure 2 As shown, it includes the following steps:

[0041] S1, carburizing step: put the traction gear of the locomotive into a carburizing furnace with an initial temperature of about 900°C, raise the temperature to 920°C, and feed a carburizing agent into the carburizing furnace to form a carburizing atmosphere. The carburizing agent is methanol and ethane , propane, ethanol, propanol, ethyl aceta...

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Abstract

The invention relates to a composite carburizing and quenching heat treatment method of a gear, and belongs to the technical field of heat treatment. The method comprises the steps of carburization, cooling, heating, quenching and tempering. The composite carburizing and quenching heat treatment method can effectively refine grains and martensite needles, improves the gear surface hardness, further improves the wear resistance, the fatigue strength and the corrosion resistance of the gear, and improves comprehensive mechanical performance of the gear.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a compound carburizing and quenching heat treatment method for locomotive traction gears, and belongs to the technical field of heat treatment. Background technique [0002] For high-speed trains, gears are crucial parts directly related to train safety. In recent years, the speed increase of trains has posed new challenges to the performance of locomotives, and thus put forward higher requirements for the performance of locomotive traction gears. Specifically, the gear is required not only to have sufficient strength and impact toughness to ensure absolute safety and reliability under the highest speed and load; but also to have excellent hardness and wear resistance on the surface of the gear to ensure good contact fatigue performance and Long life. [0003] At present, the heat treatment of locomotive traction gears basically adopts the process of carburizing and quenching surface ...

Claims

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Application Information

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IPC IPC(8): C23C8/22C21D1/18C21D9/32
CPCC21D1/18C21D9/32C21D2211/008C23C8/22
Inventor 刘聪敏黄星谭小明石磊
Owner CRRC QISHUYAN INSTITUTE CO LTD
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