Composite modification method used for multiplying thickness and hardness of steel nitriding layers or rapid heating quenching hardened layers

A quenching hardening and rapid heating technology, applied in the field of steel modification, can solve the problem of not being able to prepare high hardness and thick hardened layer at the same time, so as to improve the metallographic structure and mechanical properties, prolong the service life and shorten the processing time. Effect

Inactive Publication Date: 2015-10-07
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the surface treatment of steel in the prior art cannot prepare a high hardness and thick hardened layer at t

Method used

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  • Composite modification method used for multiplying thickness and hardness of steel nitriding layers or rapid heating quenching hardened layers
  • Composite modification method used for multiplying thickness and hardness of steel nitriding layers or rapid heating quenching hardened layers
  • Composite modification method used for multiplying thickness and hardness of steel nitriding layers or rapid heating quenching hardened layers

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specific Embodiment approach 1

[0018] Specific embodiment one: a kind of composite modification method that makes the thickness and hardness of the nitriding or rapid heating and quenching hardened layer of steel described in this embodiment is doubled, specifically according to the following steps:

[0019] 1. Pretreatment: Use 240-mesh and 800-mesh water sandpaper to polish the steel surface in turn, and then place the polished steel in ethanol and acetone for ultrasonic cleaning to obtain the pretreated steel;

[0020] 2. Nitriding: Nitriding the pretreated steel, and then cooling the steel to room temperature with the furnace in a nitrogen or ammonia atmosphere to obtain nitriding steel; the nitriding temperature is 400 ° C ~ 620°C, the nitriding time is 2h~16h;

[0021] 3. Laser quenching: In an argon or nitrogen atmosphere, blacken the steel after nitriding, and then perform laser quenching on the steel surface after blackening. The laser power is 1kW to 5kW, and the scanning speed is It is 10mm / s~30...

specific Embodiment approach 2

[0030] Embodiment 2: This embodiment differs from Embodiment 1 in that the nitriding described in step 2 is ion nitriding, gas nitriding or salt bath nitriding. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0031] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the ion nitriding is specifically carried out according to the following steps: the pretreated steel is placed in a pulse plasma multi-component co-infiltration furnace In the process, the infiltration agent is passed, and the temperature of the pulse plasma multi-component co-infiltration furnace is raised to 400 ° C ~ 620 ° C, and then kept at a temperature of 400 ° C ~ 620 ° C, a furnace pressure of 150 Pa ~ 400 Pa, and an infiltration agent plasma bombardment atmosphere for 2 hours ~ 8h, the ion nitriding is completed; the permeating agent is N 2 and H 2 mixed gas or nitrogen-containing atmosphere. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a composite modification method used for multiplying thickness and hardness of steel nitriding layers or rapid heating quenching hardened layers, and belongs to the field of steel modification method. The composite modification method is used for solving a problem that hardened layers with both high hardness and high thickness can not be prepared via conventional steel surface treatment method. The composite modification method comprises steps of pretreatment, nitriding, and laser quenching.

Description

technical field [0001] The invention relates to a method for modifying steel. Background technique [0002] Steel is the cornerstone of equipment manufacturing in various industries such as machine building, transportation and aerospace. Through chemical heat treatment (such as nitriding, carburizing, nitrocarburizing, carbonitriding, multi-component co-carburizing, etc.), the mechanical properties of the surface layer of steel parts, such as surface hardness and wear resistance, can be greatly improved. However, the fatigue damage of the transmission parts and rotating parts of the equipment mostly occurs on the surface layer of the steel, so the thickness and hardness of the modified layer have a great influence on the fatigue performance of the steel parts. Conventional nitriding treatment can obtain a certain thickness of hardened layer on the surface of steel parts. Improve the wear resistance and fatigue life of parts. For nitriding steel, to obtain a nitriding laye...

Claims

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Application Information

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IPC IPC(8): C23C8/26C21D1/09
Inventor 闫牧夫王祎雪张雁祥张程菘郭立新陈曦桐卢竞李博贾晓俊
Owner HARBIN INST OF TECH
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