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Method for formulating water-air alternate time-controlled quenching process

A cooling process and air-to-air alternation technology, which is applied in the direction of quenching agent, manufacturing tools, heat treatment equipment, etc., can solve the problems of low mechanical properties of oil quenching, fire, oil quenching oil fume pollution, etc.

Active Publication Date: 2014-12-24
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For alloy steel quenching, oil is generally used as the quenching medium to avoid cracking. The problem is that the mechanical properties of oil quenching are much lower than that of water quenching. At the same time, oil quenching has the risk of oil smoke pollution and fire.
The technology in this document has obvious effects on avoiding cracking of alloy steel parts, but the method of formulating the second-stage water-air alternate quenching and cooling process has not been described in detail, and the process formulation of this stage is to obtain the required performance of the quenching object and avoid cracking key

Method used

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  • Method for formulating water-air alternate time-controlled quenching process
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  • Method for formulating water-air alternate time-controlled quenching process

Examples

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Embodiment 1

[0029] Adopt a kind of method described in the present invention to formulate water-air alternate time-controlled quenching and cooling process to process the long axis of Ф200mm of medium-carbon alloy steel as the material, and require the surface to be halfway to the center (50mm away from the surface) after quenching The obtained structure is 50% martensite and bainite and 50% pearlite and ferrite; the medium used in the water-air alternating time-controlled quenching and cooling process is water and air, and the specific steps include:

[0030] The first step is to determine the performance testing site and the organizational requirements for the testing site;

[0031] The second step, combined with the continuous cooling transformation curve (CCT) of supercooled austenite in medium carbon alloy steel, in order to obtain the expected structure at the position 50mm away from the surface of the long-axis section of Ф200mm, it should be from the surface to the position 50mm aw...

Embodiment 2

[0050] Adopting a method of formulating water-air alternate time-controlled quenching and cooling process according to the present invention to process 718 plastic mold steel with a thickness of 300mm, it is required that the structure from the surface to the center after quenching is bainite and a small amount of retained austenite; The media used in the water-air alternately controlled quenching and cooling process are water and air, and the specific steps are as follows:

[0051] The first step is to estimate the continuous cooling transformation curve (CCT) of supercooled austenite in 718 steel, and reduce the temperature of the entire section (surface to core) to below 600°C within 2600S to obtain the required structure. ;

[0052] In the second step, since the structure from the surface to the center after quenching is required to be bainite and a small amount of retained austenite, the 718 plastic mold steel is divided into control cooling rate areas from the surface to...

Embodiment 3

[0061] The H13 mandrel is processed by a method of formulating a water-air alternate time-controlled quenching and cooling process described in the present invention. It is required that the mechanical properties at a distance of 1 / 2R (R is the radius of the axis) from the surface after treatment should be higher than the specified value. The quenching medium adopts polymer water-soluble medium and air.

[0062] According to the method of Example 1, a water-air alternate time-controlled quenching and cooling process was developed.

[0063] After processing according to this process, the performance of the product meets the requirements, and there is no crack.

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Abstract

The invention provides a method for formulating a water-air alternate time-controlled quenching process. The method comprises the following steps of: step 1, predicating a structure composition of a part with required performance according to the performance detection part of an alloy steel piece and specific performance requirements; step 2, according to the super-cooled austenite isothermal cooling transformation curve or the super-cooled austenite continuous cooling transformation curve of a material, acquiring the longest cooling time or the minimum cooling speed which the structure needs to reach a certain temperature; step 3, dividing an alloy steel piece into a cooling speed control area and a slow cooling area along a section from the surface to the centre; step 4, determining the water-air alternation times of the cooling speed control area, and a water-cooling time and an air-cooling time each time; and step 5, determining the water-air alternation times of the slow cooling area, and a water-cooling time and an air-cooling time each time. With the adoption of the method provided by the invention, the alloy steel piece can obtain required performance or structure on the premise of avoiding cracking; and the method is suitable for a quenching treatment for the alloy steel pieces with various ingredients.

Description

technical field [0001] The invention relates to a process for quenching and cooling alloy steel, in particular to a method for formulating a water-air alternate time-controlled quenching and cooling process. Background technique [0002] Quenching and tempering is a traditional process, which heats alloy steel parts to the austenite zone, then quenches and cools to room temperature to obtain martensitic structure, and then tempers at a suitable temperature to obtain tempered martensite organize. For alloy steel quenching, oil is generally used as the quenching medium to avoid cracking. The problem is that the mechanical properties of oil quenching are much lower than that of water quenching. At the same time, oil quenching has the risk of oil smoke pollution and fire. Therefore, water quenching of alloy steel parts is the future development direction, and the premise of promoting the water quenching process is to solve the problem of water quenching cracking. [0003] Afte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D6/00C21D1/60C21D1/613
Inventor 陈乃录左训伟戎咏华
Owner SHANGHAI JIAOTONG UNIV
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