A New Quenching-Partitioning-Austempering Heat Treatment Method for Obtaining Si System Ultra-High Strength Disc Springs

An isothermal quenching and ultra-high-strength technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of reduced brittle fracture strength and unusable products, and achieve the effect of rapid production and reliable technical support

Active Publication Date: 2021-10-12
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above two heat treatment processes, if the tempering temperature or isothermal temperature is lowered, the hardness of the disc spring can be increased, but because the microstructure has hard and brittle carbides, it will cause a decrease in the brittle fracture strength, making the product unable to use

Method used

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  • A New Quenching-Partitioning-Austempering Heat Treatment Method for Obtaining Si System Ultra-High Strength Disc Springs
  • A New Quenching-Partitioning-Austempering Heat Treatment Method for Obtaining Si System Ultra-High Strength Disc Springs
  • A New Quenching-Partitioning-Austempering Heat Treatment Method for Obtaining Si System Ultra-High Strength Disc Springs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1: 60Si2Mn disc spring (outer diameter: 40mm, inner diameter: 20mm, effective thickness: 3mm)

[0057] The microstructure of 60Si2Mn disc spring after treatment by Q-P-A (quenching-partitioning-austempering) process is shown in Figure 3. It can be seen that a multi-phase microstructure has been formed, and a nanoscale (less than 100nm) super bainite microstructure ((BF+RA)nano) is formed on the outside of the sheet-like carbon reduction M-c. It is beneficial to the improvement of the strength and toughness of the disc spring. In other areas, fine needle-like BF and membranous RA were obtained, and massive RA was also seen.

Embodiment 2

[0058] Embodiment 2: the comparison of different heat treatment processes 60Si2Mn disc spring tensile strength and hardness;

[0059] The comparison of the tensile strength and hardness of the 60Si2Mn disc spring after the Q-P-A (quenching-partitioning-austempering) heat treatment process described in the examples and the traditional heat treatment process is as follows: Figure 4 shown. It can be seen that compared with the disc spring of traditional technology, after the Q-P-A heat treatment process described in the embodiment, the hardness value has been greatly improved, from the original 40HRC to more than 56HRC, which is more than 1.4 times the original value. The strength increased from 1530MPa to 2520Mpa, which is 1.65 times of the original.

Embodiment 3

[0060] Embodiment 3: the comparison of different heat treatment processes 60Si2Mn disc spring compression performance;

[0061] The compression behavior of the 60Si2Mn disc spring after the Q-P-A (quenching-partitioning-austempering) heat treatment process described in the examples and the traditional heat treatment process is as follows Figure 5 shown. It can be seen that both disc springs did not fail. Compared with the traditional disc spring, after the Q-P-A heat treatment process described in the embodiment, the 60Si2Mn disc spring can withstand greater pressure under the same deflection of 1.3mm, which is 1.1 times that of the traditional disc spring.

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Abstract

The present invention relates to a new quenching-partitioning-austempering heat treatment method for obtaining Si-based ultra-high-strength disc springs, through the control of temperature, time and cooling speed in the heating, cooling and heat preservation process, and the cooperation of the above process parameters. A new type of multi-phase microstructure composed of carbon-reduced martensite, fine bainitic ferrite, retained austenite and nano-super bainite was obtained in the disc spring. Through the coordinated strengthening and toughening effect of the strengthening phase and the toughening phase in the above multi-phase structure, the hardness of the ordinary Si-based disc spring can be increased from HRC42‑52 to HRC58‑60 under the condition of satisfying the elastic limit, and the tensile strength The increase from 1400-1600MPa to 2500MPa ultra-high strength level provides a theoretical and practical basis for the upgrading of disc springs. In the actual industrial production of this process, there is no need for salt bath treatment and oil quenching, thereby reducing environmental pollution and saving energy, and achieving the purpose of green production.

Description

technical field [0001] The invention relates to a new quenching-partitioning-isothermal quenching heat treatment method for obtaining Si-based ultra-high-strength disc springs, which belongs to the field of manufacturing important basic parts for the mechanical equipment industry and the national defense industry. New heat treatment method and new technology for service life. Background technique [0002] Disc spring is a basic part of important mechanical equipment, which is widely used in various fields such as rocket launch, transportation machinery and so on. According to its working conditions and common failure modes, the high strength (plastic deformation resistance and brittle fracture resistance) of disc spring materials is an important guarantee for improving vibration absorption and service life, and it is also the development goal of lightweight parts. [0003] However, the traditional heat treatment process to improve the strength of disc springs is quenching a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/02C21D1/18C21D1/20
CPCC21D1/18C21D1/20C21D9/02C21D2211/001C21D2211/002C21D2211/005C21D2211/008
Inventor 刘澄王璇鲁聪颖周文韬董克文赵振波
Owner YANGZHOU UNIV
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