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Heat treatment method for improving residual austenite morphology and improving TRIP steel mechanical property

A heat treatment method and morphology technology, applied in the direction of heat treatment furnace, heat treatment equipment, process efficiency improvement, etc., can solve the problem of not being reached, and achieve the effect of fast heating rate, short heat treatment cycle, high strength and plasticity

Active Publication Date: 2018-09-14
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength of the TRIP steel produced by the traditional process in the past is 780MPa, which shows that the parameters of the heat treatment process in the past have not yet reached an optimal value.

Method used

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  • Heat treatment method for improving residual austenite morphology and improving TRIP steel mechanical property
  • Heat treatment method for improving residual austenite morphology and improving TRIP steel mechanical property
  • Heat treatment method for improving residual austenite morphology and improving TRIP steel mechanical property

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A heat treatment method for improving the para-austic morphology and improving the mechanical properties of TRIP steel, comprising the following steps:

[0034] Step 1: Austenitizing pretreatment system

[0035] Select fully cleaned TRIP780 cold-rolled sheet as the initial material, put it in a salt bath, perform austenitizing pretreatment, and then water quench to obtain austenitizing pretreated steel plate; among them, the temperature of austenitizing pretreatment The temperature is 925℃, and the time of austenitizing pretreatment is 90s;

[0036] The fully cleaned TRIP780 cold-rolled steel plate is a standard tensile test sample with a gauge length of 50mm made from a 1.2mm thick TRIP780 cold-rolled steel plate according to GB / T228-2010.

[0037] The cleaning steps for the fully cleaned TRIP780 cold-rolled sheet are: first use acetone to remove rust and oil, and then use alcohol to clean it to avoid uneven heating during heat treatment.

[0038] Step 2: Transition ...

Embodiment 2

[0048] A heat treatment method for improving the para-austic morphology and improving the mechanical properties of TRIP steel, comprising the following steps:

[0049] Step 1: Austenitizing pretreatment system

[0050] Select fully cleaned TRIP780 cold-rolled sheet as the initial material, put it in a salt bath, perform austenitizing pretreatment, and then water quench to obtain austenitizing pretreated steel plate; among them, the temperature of austenitizing pretreatment The temperature is 925℃, and the time of austenitizing pretreatment is 90s;

[0051] The fully cleaned TRIP780 cold-rolled steel plate is a standard tensile test sample with a gauge length of 50mm made from a 1.2mm thick TRIP780 cold-rolled steel plate according to GB / T228-2010.

[0052] The cleaning steps for the fully cleaned TRIP780 cold-rolled sheet are: first use acetone to remove rust and oil, and then use alcohol to clean it to avoid uneven heating during heat treatment.

[0053] Step 2: Transition ...

Embodiment 3

[0063] A heat treatment method for improving the para-austic morphology and improving the mechanical properties of TRIP steel, comprising the following steps:

[0064] Step 1: Austenitizing pretreatment system

[0065] Select fully cleaned TRIP780 cold-rolled sheet as the initial material, put it in a salt bath, perform austenitizing pretreatment, and then water quench to obtain austenitizing pretreated steel plate; among them, the temperature of austenitizing pretreatment The temperature is 925℃, and the time of austenitizing pretreatment is 90s;

[0066] The fully cleaned TRIP780 cold-rolled steel plate is a standard tensile test sample with a gauge length of 50mm made from a 1.2mm thick TRIP780 cold-rolled steel plate according to GB / T228-2010.

[0067] The cleaning steps for the fully cleaned TRIP780 cold-rolled sheet are: first use acetone to remove rust and oil, and then use alcohol to clean it to avoid uneven heating during heat treatment.

[0068] Step 2: Transition ...

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Abstract

The invention discloses a heat treatment method for improving residual austenite morphology and improving TRIP steel mechanical property and belongs to the technical field of new material heat treatment. The heat treatment method comprises the steps that a TRIP steel cold-rolled sheet is placed in salt bath and is preprocessed under the temperature of 905-945 DEG C for 60-120 s in an austenitizingmode and then quenched; the austenitizing preprocessed steel sheet is placed in the salt bath and is subjected to two-phase region transfer under 760-820 DEG C for 60-180 s; the steel sheet of the two-phase structure of ferrite and austenite is rapidly placed in a bainite transition zone of 460-520 DEG C and is subjected to isothermal quenching for 15-35 s; the steel plate is rapidly placed in abainite transition zone of 380-440 DEG C and subjected to isothermal quenching for 205-225 s and then is quickly subjected to water quenching, so that the high strength and high-ductility TRIP steel is obtained. A plurality of evenly-distributed thin-film-shaped residual austenites can be acquired by reasonable selection and interworking of technological parameters, the TRIP effect can be better performed, strength and plasticity of the TRIP steel are improved and the method is expected to be an effective process achieving the lightweight of automobiles.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of new materials, and in particular relates to a heat treatment method for improving the morphology of para-alcohol and improving the mechanical properties of TRIP steel. Background technique [0002] In order to solve the environmental problems and energy crisis brought about by the rapid economic development, the steel industry and the automotive steel industry have undergone transformation and development in recent years. The lightweight and safe production of automotive steel has become the main goal of current research and application. TRIP steel (Transformation Induced Plasticity Steel) has both high strength and good ductility, and is widely used in automobile companies. Its excellent mechanical properties mainly depend on the TRIP effect and the multiphase structure in TRIP steel. The TRIP effect refers to the phenomenon that the material is transformed from the soft phase austenit...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/20C21D9/00
CPCC21D1/18C21D1/20C21D9/0081C21D2211/001C21D2211/002C21D2211/005Y02P10/20
Inventor 刘沿东李俊博许森刘芳策王帅
Owner NORTHEASTERN UNIV
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