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Martensite, bainite and austenite grinding ball continuous isothermal quenching heat treatment method and device

A kind of isothermal quenching and austenite technology, used in quenching device, heat treatment furnace, heat treatment equipment and other directions, can solve the problems of inability to apply inspection and production process, difficult to achieve continuous isothermal quenching, large temperature difference between the inside and outside of the grinding ball, etc. The core and the surface have uniform structure, good impurities and good performance.

Active Publication Date: 2021-12-24
云南衡纬科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is easy to distinguish austenite from M and B, but it is very difficult to distinguish M and B mainly by observing the distribution of needles and the internal structure of the middle ridge. Some materials indicate the content of the structure, but it cannot be applied in practice. to the inspection and production process
[0004] However, in the cooling process of metal grinding balls, it is difficult to achieve continuous isothermal quenching due to the inability to accurately control the cooling speed of the grinding balls, thereby bypassing the temperature transition zone of the pearlite, resulting in a large temperature difference between the inside and outside of the grinding balls, resulting in large tissue stress and making Severe cracking of grinding balls after quenching

Method used

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  • Martensite, bainite and austenite grinding ball continuous isothermal quenching heat treatment method and device
  • Martensite, bainite and austenite grinding ball continuous isothermal quenching heat treatment method and device
  • Martensite, bainite and austenite grinding ball continuous isothermal quenching heat treatment method and device

Examples

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no. 1 example

[0033] Please refer to Figure 1-2 . The continuous isothermal quenching heat treatment method of martensite, bainite and austenite grinding balls includes: firstly austenitize the grinding balls and then put them into the circulating water of the heat treatment drum for water cooling, after the water cooling heat treatment, the temperature of the grinding balls is at the bainite transformation temperature interval, take out the grinding balls, put them into the holding furnace for isothermal tempering, and obtain martensite, bainite, and austenite grinding balls;

[0034] Specific steps are as follows:

[0035] Step 1. First, austenitize the grinding ball at 780-960°C;

[0036] Step 2. Put the austenitized grinding balls in step 1 into the circulating water in the drum for water cooling. After continuous isothermal quenching heat treatment, when the temperature of the grinding balls is 200-320°C, take out the grinding balls and put them in the holding furnace for isothermal...

no. 2 example

[0051] Based on the continuous austempering heat treatment method and device for martensite, bainite and austenite grinding balls provided in the first embodiment of the present application, the second embodiment of the present application proposes another martensite, bainite, Austenitic grinding ball continuous austempering heat treatment method and device. The second embodiment is only a preferred mode of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0052] The second embodiment of the present invention will be further described below in conjunction with the drawings and implementation methods.

[0053] Please refer to Figure 3-4 The continuous austempering heat treatment device for martensite, bainite and austenite grinding balls also includes a frame 12, the frame 12 is arranged on one side of the drum support 2, and the frame 12 is provided with a spare liquid guiding mecha...

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Abstract

The invention provides a martensite, bainite and austenite grinding ball continuous isothermal quenching heat treatment method and device. The martensite, bainite and austenite grinding ball continuous isothermal quenching heat treatment method comprises the steps that firstly, grinding balls are austenitized and then put into heat treatment roller circulating water to be subjected to water cooling, the temperature of the grinding balls is within the bainite transformation temperature range after water cooling heat treatment, the grinding balls are taken out and put into a heat preservation furnace to be subjected to isothermal tempering, and the martensite, bainite and austenite grinding balls are obtained. The martensite, bainite and austenite grinding ball continuous isothermal quenching heat treatment method and device have the advantages that the cooling speed of the grinding balls is accurately controlled by adjusting the water level height, flow, water temperature and roller rotating speed in a roller, the continuous isothermal quenching effect is achieved, the pearlite temperature transformation range is bypassed, the temperature difference between the interior and the exterior of the grinding balls is small, the structure stress is reduced, and quenching cracking of the grinding balls is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of heat treatment of metal materials, in particular to a continuous isothermal quenching heat treatment method and device for martensite, bainite and austenite grinding balls. Background technique [0002] For ferrous metals, austenite: it is a single face-centered cubic structure, carbon and alloying elements are dissolved in the pores of the face-centered lattice (γ-iron), and its austenite transformation temperature or existence temperature is very different from the alloy composition A large relationship, which appears in the austenitic stainless steel. Features: low hardness, easy to deform. Martensite: A supersaturated solid solution of carbon in low-temperature body-centered cubic iron (α-iron). When the formation temperature is below the Ms point, there are mainly twin structures rather than dislocations, and the mid-ridge is particularly obvious. Since there is no diffusion of carbon and alloy el...

Claims

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Application Information

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IPC IPC(8): C21D1/20C21D9/36C21D1/64
CPCC21D1/20C21D9/36C21D1/64C21D2211/008C21D2211/002C21D2211/001
Inventor 牛文峰彭权邹兴龙
Owner 云南衡纬科技有限公司