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A heat treatment method for improving comprehensive mechanical properties of gcr15 steel

A heat treatment method and a technology of comprehensive mechanics, applied in the field of heat treatment of metal materials, can solve the problems of good toughness, low hardness, and poor toughness of bainite structure, and achieve the effect of small bainite size, increased surface hardness, and improved toughness

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

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Problems solved by technology

[0005] The purpose of the present invention is to provide a heat treatment method for improving the comprehensive mechanical properties of GCr15 steel, overcome the problem of high hardness and poor toughness of the martensite structure obtained by the traditional martensite austempering process, and overcome the problem of full bainite austempering The bainite structure obtained by the process has good toughness and low hardness

Method used

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  • A heat treatment method for improving comprehensive mechanical properties of gcr15 steel
  • A heat treatment method for improving comprehensive mechanical properties of gcr15 steel
  • A heat treatment method for improving comprehensive mechanical properties of gcr15 steel

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Embodiment 1

[0044] A heat treatment method for improving comprehensive mechanical properties of GCr15 steel, comprising the following steps:

[0045] Step 1. Put the GCr15 steel into the heat treatment furnace preheated to 480°C for preheating. If the heat treatment furnace cannot be charged in the middle, it can also be charged at room temperature. The GCr15 steel is heated to 480°C to make the heat treatment material uniform temperature, and then The temperature is raised to 540°C at a rate of 8°C / min, and the temperature is kept for 40 minutes; the main purpose of this preheating process is to reduce the temperature difference between the internal and surface of the steel, and reduce the excessive thermal stress and structural stress caused by the excessive internal and external temperature difference caused by the excessive heating speed. Large, resulting in the formation of cracks.

[0046] Step 2. Raise the temperature from 540°C to 840°C at a heating rate of 5°C / min, and keep it wa...

Embodiment 2

[0053] A heat treatment method for improving comprehensive mechanical properties of GCr15 steel, comprising the following steps:

[0054] Step 1. Put the GCr15 steel into a heat treatment furnace preheated to 500°C for preheating. If the heat treatment furnace cannot be charged in the middle, it can also be charged at room temperature. The temperature is raised to 560°C at a rate of 12°C / min, and the temperature is kept for 30 minutes; the main purpose of this preheating process is to reduce the temperature difference between the internal and surface of the steel, and reduce the excessive thermal stress and structural stress caused by the excessive internal and external temperature difference caused by the excessive heating speed. Large, resulting in the formation of cracks.

[0055] Step 2. Raise the temperature from 560°C to 860°C at a heating rate of 7°C / min, and keep it warm for 30 minutes after reaching the temperature. Compared with the heating rate in the preheating sta...

Embodiment 3

[0062] A heat treatment method for improving comprehensive mechanical properties of GCr15 steel, comprising the following steps:

[0063] Step 1. Put the GCr15 steel into a heat treatment furnace preheated to 490°C for preheating. If the heat treatment furnace cannot be charged in the middle, it can also be charged at room temperature. The GCr15 steel is heated to 490°C to make the heat treatment material uniform temperature, and then The temperature is raised to 550°C at a rate of 10°C / min, and the temperature is kept for 35 minutes; the main purpose of this preheating process is to reduce the temperature difference between the internal and surface of the steel, and reduce the excessive thermal stress and structural stress caused by the excessive internal and external temperature difference caused by the excessive heating speed. Large, resulting in the formation of cracks.

[0064] Step 2. Raise the temperature from 550°C to 850°C at a heating rate of 6°C / min, and keep it war...

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Abstract

The invention relates to a heat treatment method for improving the comprehensive mechanical properties of GCr15 steel: step 1, put the GCr15 steel into a preheated heat treatment furnace for preheating, so that the heat treatment materials are evenly heated, and then heat up to 540°C-560°C and keep warm ; Step 2, heat up from 540°C-560°C to 840°C-860°C, and keep warm; Step 3, the salt bath furnace used for quenching, needs to be pre-heated to 190-210°C, and kept for a period of time; Step 4, Step 2 The GCr15 steel after heat preservation is immediately put into the salt bath furnace for austempering; step 5, the sample after austempering is taken out of the salt bath furnace, cooled slowly, and the salt on the surface is cleaned after cooling to room temperature. The invention can overcome the problem of high hardness and poor toughness of the martensite structure obtained by the traditional martensite austempering process, and overcome the problem of good toughness and low hardness of the bainite structure obtained by the full bainite austempering process.

Description

technical field [0001] The invention belongs to the field of heat treatment of metal materials, and relates to a heat treatment process for GCr15 steel to obtain a martensite+bainite mixed structure and improve comprehensive mechanical properties. Background technique [0002] GCr15 steel currently has a variety of heat treatment processes, especially the martensite + bainite mixed structure obtained by the austempering heat treatment process can meet the requirements for the hardness and wear resistance of GCr15 steel, and its toughness is also improved. [0003] GCr15 bearing steel is mainly used to make parts of rolling bearings, such as rolling elements and bearing rings. When the bearing is working, the surface should have sufficient hardness and wear resistance, and also need to have a certain impact toughness. In recent years, in order to improve the strength and toughness of high-carbon chromium bearing steel, a lot of research has been done on the martensitic auste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/20C21D1/68C21D1/607C21D1/63C21D6/00
CPCC21D1/20C21D1/607C21D1/63C21D1/68C21D6/002C21D2211/002C21D2211/008
Inventor 于兴福刘洪秀孙金池魏英华刘天明高悦曲彦平刘金玲杨文武张明帅刘永宝安敏
Owner SHENYANG POLYTECHNIC UNIV