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Metal piece treatment method

A treatment method and technology for metal parts, which is applied to the organic combination of cryogenic treatment and other treatments such as tempering treatment to treat metal parts, and the field of cryogenic treatment of metal parts, which can solve the problems of neglecting collocation, limitation of cryogenic treatment effect, excessive temperature difference, etc. question

Inactive Publication Date: 2014-06-04
何萌 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this document, the temperature difference between high temperature and cryogenic temperature is too large (from 750°C to -196°C), while it can improve some properties of the alloy, it also seriously damages other properties
[0010] Although there are a large number of reports on cryogenic treatment of metal parts in the prior art, the final performance of the material depends not only on the cryogenic treatment process itself, but also on the matching process between cryogenic treatment and heat treatment and cryogenic treatment. , that is, depending on the organic combination between them, in the above-mentioned prior art, only focus on cryogenic itself, ignoring its collocation with heat treatment and thermal processing, or even if there is a certain collocation, but the collocation is simple, so that cryogenic treatment The effect is limited
In addition, there is also a lack of low-cost means and equipment that can obtain low temperature conveniently, cheaply, reliably and controllably in the prior art

Method used

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Embodiment 1

[0043] The crankshaft parts of the piston compressor are treated as follows (1) tempering treatment, (2) cryogenic treatment, step (3) tempering treatment again, and step (4) cryogenic treatment again, wherein the tempering of step (1) The treatment is low-temperature tempering, the treatment temperature is 100°C, and the treatment time is 4h. The cryogenic treatment temperature in step (2) is about -70°C, and the treatment time is 4h. The tempering treatment in step (3) is high-temperature tempering. The temperature is 600°C, and the processing time is 4 hours. The cryogenic treatment temperature in step (4) is about -200°C, and the processing time is 1 hour. After the cryogenic treatment in step (2), the metal parts are controlled to return to room temperature, and the heating rate is 8°C / min, after the cryogenic treatment in step (4), control the temperature of the metal parts to room temperature, the heating rate is 2°C / min, repeat the above steps (1) to (4) for 2 cycles. ...

Embodiment 2

[0055] The Cr12MoV steel strip is subjected to the following treatments (1) tempering treatment, (2) cryogenic treatment, step (3) tempering treatment again, and step (4) cryogenic treatment again, wherein the tempering treatment of step (1) is low temperature tempering Fire, the treatment temperature is 100°C, the treatment time is 4h, the cryogenic treatment temperature in step (2) is about -70°C, the treatment time is 4h, the tempering treatment in step (3) is high temperature tempering, and the treatment temperature is 600°C , the processing time is 4 hours, the cryogenic treatment temperature in step (4) is about -200°C, and the processing time is 1 hour. After the cryogenic treatment in step (2), the metal parts are controlled to return to room temperature, and the heating rate is 8°C / min , after the cryogenic treatment in step (4), control the temperature of the metal parts to room temperature, the heating rate is 2°C / min, and repeat the above steps (1) to (4) for 2 cycl...

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Abstract

The invention discloses a metal piece treatment method which orderly comprises the following steps: (1) tempering a metal piece, and (2) performing a subzero treatment on the metal piece; the metal piece treatment method also comprises a step (3) of tempering the metal piece and a step (4) of performing the subzero treatment on the metal piece in sequence after the step (2). The metal piece treated by the method disclosed by the invention has excellent hardness, impact toughness, bending strength, wear resistance and service life.

Description

technical field [0001] The present invention relates to a method for treating metal parts, in particular to a cryogenic treatment method for metal parts, and more particularly to a method for treating metal parts through an organic combination of cryogenic treatment and other treatments such as tempering treatment. Background technique [0002] Cryogenic treatment is a new technology that places the workpiece to be processed in a specific and controllable low temperature environment to change the microstructure of the material, thereby improving or improving the performance of the material. Due to the change of the microstructure of the processed material in the low temperature environment, the improvement of the wear resistance, dimensional stability, tensile strength, residual stress and other aspects of the material is manifested macroscopically. [0003] Regarding the mechanism of cryogenic treatment, it is still in the initial stage of research, and the understanding of...

Claims

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Application Information

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IPC IPC(8): C21D6/04
Inventor 何萌闫曼玲
Owner 何萌