Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Deep-layer high-hardness composite surface quenching reinforcing method

A composite surface, high hardness technology, applied in the direction of improving energy efficiency, process efficiency, etc., can solve the problems of unable to meet the performance requirements of metal components, restrict the development of science and technology, and discontinuous hardness, etc., to achieve excellent overall surface performance and excellent size Accuracy, effect of large case depth

Inactive Publication Date: 2018-07-24
HUAZHONG UNIV OF SCI & TECH
View PDF19 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the quenching must be controlled without melting the surface, the depth of the hardened layer is usually shallow (0.2-1.2mm), and when quenching a large area, the processing efficiency is low, there are soft bands between the scanning bands, and the hardness is discontinuous
[0008] In summary, the existing surface strengthening technology is still unable to meet the performance requirements of the industry for metal components, which has become a major bottleneck restricting the development of my country's science and technology

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Deep-layer high-hardness composite surface quenching reinforcing method
  • Deep-layer high-hardness composite surface quenching reinforcing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] GCr15 steel is mainly used in the manufacture of spindle bearings, rolling bearings, balls, bushings and molds. Due to harsh service environments such as strong corrosion, high alternating loads, large temperature differences, and complex loading conditions, the main failure mode is contact fatigue damage. Therefore, in this example, GCr15 steel is selected for surface deep layer high-precision compound quenching strengthening.

[0051] The material selected for this test is a GCr15 steel sample with a size of Φ300mm×80mm after standard quenching + low-temperature tempering heat treatment. The Rockwell hardness test is carried out according to the national standard GB / T 230.1-2009, and the hardness value is 45-55HRC. The surface strengthening treatment of the sample is carried out, the specific process is as follows:

[0052] (1) Medium-frequency induction hardening: put the sample into the medium-frequency induction heating device and rotate at a speed of 60 rpm. The ...

Embodiment 2

[0057] 45# steel is a common material for manufacturing important core parts such as heavy truck rollers, automobile half shafts, crankshafts, camshafts, and machine tool gears. These components are subjected to complex and heavy loads, and the service environment is harsh, so wear and fatigue fracture are the main failure modes. Therefore, in this example, 45# steel is selected for surface deep layer high-precision compound quenching strengthening.

[0058]The material used in this test is a 45# carbon steel sample with a size of Φ200mm×100mm after standard quenching and tempering treatment. The Rockwell hardness test is carried out according to the national standard GB / T 230.1-2009, and the hardness is 30-45HRC. The surface of the sample is strengthened, the specific process is as follows:

[0059] (1) Electromagnetic induction quenching: Put the sample into the electromagnetic induction heating device to rotate at a speed of 100 rpm, the power frequency is 100kHz, and the...

Embodiment 3

[0064] 42CrMo steel is usually used to manufacture components with high strength requirements and large cross-sectional dimensions. The main mode of failure of these components is fatigue fracture. Therefore, this example selects 42CrMo steel for surface deep layer high-precision compound quenching strengthening.

[0065] The material used in this test is a 42CrMo steel sample with a size of 200mm×200mm×100mm after standard quenching and tempering treatment. The Rockwell hardness test is carried out according to the national standard GB / T 230.1-2009, and the hardness is 40-50HRC. The surface of the sample is strengthened, the specific process is as follows:

[0066] (1) Medium-frequency induction hardening: put the sample into the medium-frequency induction heating device and rotate at a speed of 120 rpm, and the inductor uses a heating power of 150kW to heat the sample so that the surface of the material reaches above the austenitization temperature. Evenly keep warm for 1...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
depthaaaaaaaaaa
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a deep-layer high-hardness composite surface quenching reinforcing method of metal and alloy members and belongs to the field of surface heat treatment. The method comprises the steps: firstly, obtaining an induction quenched hardened layer with a depth of 2 to 20mm, a grain size of 7 to 10 levels and a hardness value of 45 to 62HRC on the surface of a part through induction heating pre-quenching; then utilizing machining to make the part reach an assembling accuracy and a finish degree required by the surface; finally, utilizing high energy beam surface phase change quenching to obtain a high energy beam quenched hardened layer with a depth of 0.1 to 2.5mm, a grain size of 10 to 16 levels and a hardness value of 62HRC on the surface of the part. The obtained composite hardened layer disclosed by the invention is prepared from the induction quenched hardened layer on the secondary surface layer and the high energy beam quenched hardened layer on the surface layer; thus, surface wear resistance and fatigue life of the metal and alloy materials are improved, and a strict requirement of the modern industry on the metal and alloy materials is met.

Description

technical field [0001] The invention relates to the technical field of surface quenching and strengthening treatment, in particular to a deep-layer high-hardness composite surface quenching and strengthening treatment method suitable for metal and alloy parts. Background technique [0002] With the development of industrial fields such as metallurgy, heavy mining, petroleum, ship weapons, loading, military industry, aerospace and power stations towards large load, high precision, high efficiency and high automation, the performance requirements for key core components are also increasing. harsh. Therefore, the development of manufacturing and processing methods for metal and alloy parts with high wear resistance, high assembly accuracy, long service life, and excellent operational reliability is not only the key core link of my country's advanced manufacturing technology, but also a strong support for the vigorous development of high-tech. [0003] At present, many successf...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/10C21D1/09C21D1/04C21D1/18
CPCC21D1/04C21D1/09C21D1/10C21D1/18Y02P10/25
Inventor 王泽敏杨晶晶王邓志喻寒琛孟梁曾晓雁
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com