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A method for preparing composite nitriding layer on the surface of die steel

A technology of die steel and compound infiltration, which is applied in the direction of coating, solid diffusion coating, metal material coating technology, etc., can solve the problems of easy formation, long time of gas nitriding, shallow permeation layer, etc., and achieve stable performance and shorten Effect of Nitriding Time and Improvement of Wear Resistance

Active Publication Date: 2020-12-01
INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, problems such as long gas nitriding time, shallow nitriding layer, and brittle continuous nitride layer containing ε phase on the surface after nitriding have been widely concerned.

Method used

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  • A method for preparing composite nitriding layer on the surface of die steel
  • A method for preparing composite nitriding layer on the surface of die steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing a composite nitrided layer on the surface of die steel, the specific steps are as follows:

[0023] A. Pulse circuit and gas preparation: use a pulse circuit with a voltage of 2kV, a capacitance of 1000μF, an inductance of 30μH, and a frequency of 2Hz; the explosive gas is a mixed gas composed of propane, oxygen, and air, and a tungsten rod is used as an electrode;

[0024] B. Installation: Fix the H13 mold steel on the movable working platform;

[0025] C. Gas combustion explosion: Air is introduced into the explosion chamber first, then propane and oxygen are introduced in a ratio of 1:5 (propane flow rate: 6 l / min, oxygen flow rate: 30 l / min), and start the ignition device, mix The gas burns and explodes, forming an explosive flame;

[0026] D. High-voltage discharge: start the power supply and apply pulse voltage to cause pulse discharge between the electrode and H13 mold steel;

[0027] E. Preparation of surface modification layer: Accordin...

Embodiment 2

[0033] A method for preparing a composite nitrided layer on the surface of die steel, the specific steps are as follows:

[0034] A. Pulse circuit and gas preparation: use a pulse circuit with a voltage of 1kV, a capacitance of 800μF, an inductance of 50μH, and a frequency of 1Hz; the explosive gas is a mixed gas composed of propane, oxygen, and air, and a tungsten rod is used as an electrode;

[0035] B. Installation: Fix the Cr12MoV mold steel on the movable working platform;

[0036] C. Gas combustion explosion: first pass air into the explosion chamber, then pass propane and oxygen in a ratio of 1:4 (propane flow rate: 10 l / min; oxygen flow rate 40 l / min), and start the ignition device, the gas combustion An explosion occurs, forming an explosive flame;

[0037] D. High-voltage discharge: start the power supply and apply pulse voltage to cause pulse discharge between the electrode and Cr12MoV die steel;

[0038] E. Preparation of surface modification layer: According to ...

Embodiment 3

[0044] A method for preparing a composite nitrided layer on the surface of die steel, the specific steps are as follows:

[0045] A. Pulse circuit and gas preparation: use a pulse circuit with a voltage of 6kV, a capacitance of 1500μF, an inductance of 60μH, and a frequency of 4Hz; the explosive gas is a mixed gas composed of propane, oxygen, and air, and a tungsten rod is used as an electrode;

[0046] B. Installation: Fix the 40Cr mold steel on the movable working platform;

[0047] C. Gas combustion explosion: Air is introduced into the explosion chamber first, and then propane and oxygen are introduced in a ratio of 1:4.2 (propane flow: 12 l / min; oxygen flow: 50 l / min), and the ignition device is activated to allow the gas to burn An explosion occurs, forming an explosive flame;

[0048] D. High-voltage discharge: start the power supply and apply pulse voltage to cause pulse discharge between the electrode and 40Cr mold steel;

[0049] E. Preparation of surface modificat...

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Abstract

The invention discloses a method for preparing a composite nitriding layer on the surface of die steel. The method comprises the steps of firstly, conducting modification treatment on the surface of the die steel through a pulse high pressure explosion technology combining gas explosion and pulse high pressure discharge, so that a martensite fine grain modified layer is formed on the surface of the material; and then, conducting gas nitriding on the basis of the modified layer, so that the composite nitriding layer is formed on the surface of the die steel. According to the technology, explosion flame flow and the high pressure discharge effect are comprehensively utilized, so that the material surface is subjected to phase change and grain refinement; nitrogen atoms can be pushed to shiftfrom the surface to the interior conveniently in the nitriding process, and thus, the thicker nitriding layer is formed within a shorter time. The martensite fine grain modified layer with the thickness ranging from 10 microns to 100 microns can be formed in the surface of the die steel treated through the method, the thickness of the nitriding layer can be increased by 10-40% within the same nitriding time in the gas nitriding process, and the service life is prolonged by 1-3 times; and the method is applicable to surface nitriding treatment of the die steel and can be widely applied to fields such as machinery and manufacturing.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a method for preparing a composite nitrided layer on the surface of die steel. Background technique [0002] The development of the mold industry affects the manufacturing level of a country. The mold forming process replaces the traditional cutting process, which has the advantages of reducing production costs, improving production quality, and saving energy to the greatest extent. With the increasing application of high-performance metal materials such as high-strength steel and high-temperature alloys, as well as non-metallic materials and composite materials, higher requirements are placed on mold materials. Surface modification of die steel is the key to comprehensively improve die performance. Surface modification can not only improve the surface performance of the mold, but also make the surface of the mold material have high hardness, corrosion resis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/26C23C8/02C21D1/04C21D1/08C23F17/00
CPCC21D1/04C21D1/08C23C8/02C23C8/26C23F17/00
Inventor 邹晋陆磊余玖明付青峰周喆
Owner INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
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