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Heat treatment method of steel shallow carburizing

A carburizing and shallow layer technology, applied in the heat treatment field of steel shallow carburizing, which can solve the problems of low maturity and easy out of tolerance in the depth of the carburizing layer of parts

Active Publication Date: 2020-07-17
HARBIN DONGAN ENGINE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the maturity of this kind of shallow layer process is low, and the conventional process parameters have the problem that the penetration layer depth of parts is easy to exceed the tolerance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example

[0034] The gear of an auxiliary power unit requires gear carburizing, the surface hardness requires HR15N≥88, the core hardness requires HRC35-46, and the carburized layer requires (0.55-0.7)mm.

[0035] (1) Copper plating protection in the non-carburized area, the thickness of the copper layer is 0.05mm;

[0036] (2) Use a sand blasting machine to clean the carburized surface of the parts, the sand blowing pressure is 0.25Mpa, until the parts are off-white, and then carburize within 1 hour;

[0037] (3) Carburize the carburized surface in a controlled atmosphere furnace. The holding temperature is 920°C, the carbon potential of the first stage is 0.35%C, holding for 35 minutes, the second stage of carbon potential is 0.75%C, holding for 50 minutes, and the temperature is lowered to 840°C with the furnace, the carbon potential is 0.75%C, holding for 20 minutes, after the end of holding, protect The atmosphere cools down.

[0038] (4) The parts are tempered at high temperatur...

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Abstract

The invention relates to the field of heat treatment, in particular to a heat treatment method of steel shallow carburizing. The method comprises the steps that a non-carburizing area of a part is subjected to copper plating protection, the part comprises the non-carburizing area and a carburizing area, a carburizing surface of the carburizing area is cleaned, in a controlled atmosphere furnace, the carburizing surface is subjected to first-time carburizing, in a second segment of first-time carburizing, the carbon potential range is 0.75+ / -0.05%C, first-time carburizing comprises two segments, and after carburizing, the part is subjected to quenching, high-temperature tempering and copper removal. The problems that in conventional process parameters, a part carburizing layer depth is prone to being overproof, and part deforming is serious can be solved.

Description

technical field [0001] The invention relates to the field of heat treatment, in particular to a heat treatment method for shallow carburizing of steel. Background technique [0002] 16Cr3NiWMoVNbE is based on the needs of XXX10 engine development, based on Russia's ДИ-39Ш (brand name 16Х3НВФМБ-Ш) steel, a new multi-component composite heat-strength steel series gear steel developed by domestic steel mills, with excellent processing performance and use performance. Compared with 12Cr2Ni4A and other gear carburizing steels that can only be used below 170 °C, 16Cr3NiWMoVNbE high-quality carburizing steel has better comprehensive properties, such as strength, grain growth tendency, hardenability, etc. are better than 12Cr2Ni4A, and can meet The gear meshing surface of the new generation engine requires a high working temperature of ≥300°C. At present, 16Cr3NiWMoVNbE high-quality carburizing steel has been successfully used in various batch production and scientific research pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/04C23C8/22C23C8/80C21D1/18C21D6/04
CPCC23C8/04C23C8/22C23C8/80C21D1/18C21D6/04
Inventor 鞠殿巍李立群辛玉武孙东文曾西军师玉英张宇慧孙振淋辛昕宋鸿超
Owner HARBIN DONGAN ENGINE GRP
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