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Low-alloy, high-strength and high-toughness composite phase steel and heat treatment method thereof

A heat treatment method and low-alloy technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as not suitable for industrialized large-scale production, short holding time, etc., to ensure process stability and structure uniformity, and low cost , The effect of simple process

Inactive Publication Date: 2013-04-17
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technology controls the quenching temperature in a relatively high temperature range, both between Ms and Mf, and the holding time is also short, counted in seconds, which is not suitable for industrialized large-scale production, and is not suitable for ensuring process stability in the production of larger-sized products Sex and Tissue Uniformity

Method used

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  • Low-alloy, high-strength and high-toughness composite phase steel and heat treatment method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The composition and weight percentage of the steel in the embodiment of the present invention are: C: 0.40%, Si: 0.90%, Mn: 1.80%, Cr: 2.3%, Al: 2.0%, S: 0.0015%, P: 0.0066%, and the rest For Fe.

[0053] The heat treatment steps are:

[0054] (1) Heat the steel at a rate of 15°C / s to the austenitization temperature of 900°C and hold it for 5 minutes to fully austenitize the workpiece;

[0055] (2) Then quench the workpiece to room temperature 20°C to obtain part of supersaturated martensite and austenite without martensitic transformation;

[0056] (3) Then fire at 300°C, and carry out carbon distribution isothermally for 5 minutes, so that the carbon is distributed from the martensite to the retained austenite, so that the retained austenite is rich in carbon and can be stable to room temperature;

[0057] (4) Finally, the workpiece is quenched to room temperature, and a multiphase steel with stable martensite and retained austenite is obtained at room temperature. ...

Embodiment 2

[0062] The composition and weight percentage of the steel in the embodiment of the present invention are: C: 0.49%, Si: 1.90%, Mn: 0.80%, Cr: 3.0%, Al: 4.9%, S: 0.0016%, P: 0.0075%, and the rest For Fe.

[0063] The heat treatment steps are:

[0064] (1) Heat the steel at a rate of 15°C / s to the austenitization temperature of 850°C and hold it for 5 minutes to fully austenitize the workpiece;

[0065] (2) Then quench the workpiece to room temperature 20°C to obtain part of supersaturated martensite and austenite without martensitic transformation;

[0066] (3) Then tempering at 350°C, and isothermal for 10 minutes for carbon distribution, so that the carbon is distributed from martensite to retained austenite, so that the retained austenite is rich in carbon and can be stable to room temperature;

[0067] (4) Finally, the workpiece is quenched to room temperature, and a multiphase steel with stable martensite and retained austenite is obtained at room temperature.

[0068] ...

Embodiment 3

[0070] The components and weight percentages of steel in the embodiment of the present invention are: C: 0.65%, Si: 1.20%, Mn: 2.0%, Cr: 4.0%, Al: 3.0%, S: 0.0015%, P: 0.0066% , and the rest is Fe.

[0071] The heat treatment steps are:

[0072] (1) Heat the steel at a rate of 15°C / s to the austenitization temperature of 900°C and hold it for 5 minutes to fully austenitize the workpiece;

[0073] (2) Then quench the workpiece to -20°C to obtain part of the supersaturated martensite and austenite without martensitic transformation;

[0074] (3) Then tempering at 300°C, and isothermal for 30 minutes for carbon distribution, so that carbon is distributed from martensite to retained austenite, so that the retained austenite is rich in carbon and can be stable to room temperature;

[0075] (4) Finally, the workpiece is quenched to room temperature, and a multiphase steel with stable martensite and retained austenite is obtained at room temperature.

[0076] After testing, the te...

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Abstract

The invention discloses low-alloy, high-strength and high-toughness composite phase steel. The low-alloy, high-strength and high-toughness composite phase steel comprises the following components in mass percentage: 0.40-0.90% of C, 0.5-2.0% of Si, 0.5-3.0% of Mn, 0.5-4.0% of Cr, 2.0-5.0% of Al, less than or equal to 0.01% of S, less than or equal to 0.01% of P and the balance of Fe. The invention further discloses a preparation method of the low-alloy, high-strength and high-toughness composite phase steel, comprising the following steps of: firstly, quickly heating steel to 850-1000 DEG C, and keeping the constant temperature for 2-30min so as to austenitize a workpiece sufficiently; secondly, quickly quenching to -20 to 50 DEG C so as to obtain a partially supersaturated martensite and an austenite without martensitic transformation; thirdly, keeping the constant temperature of the workpiece at 300-600 DEG C for 5-600min for carbon distribution; and finally, quenching to room temperature to obtain the composite phase steel. The preparation method is simple in process; by the preparation method, steel strength is improved, good toughness is ensured, and the low-alloying cost is low; and the preparation method is wide in industrial application prospect.

Description

technical field [0001] The invention relates to an alloy steel in the technical field of materials and a heat treatment method thereof, in particular to a low-alloy ultrahigh-strength toughness multiphase steel and a heat treatment method thereof. Background technique [0002] Advanced high-strength steel is a new type of steel that was gradually developed in the 1970s. Its strengthening method is obviously different from that of traditional high-strength steel. Traditional high-strength steel mainly improves the strength of steel through solid solution strengthening, phase transformation strengthening, dispersion strengthening and fine-grain strengthening to achieve the required performance. Advanced high-strength steel On the basis of traditional strengthening methods, the role of phase transformation strengthening is fully exerted, and at the same time, with appropriate heat treatment methods, two or more phases containing martensite, bainite, ferrite and retained austeni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/34C22C38/18C21D1/18C21D11/00C21D6/00
Inventor 刘和平孙虎儿刘斌李志勇孙凤儿
Owner ZHONGBEI UNIV
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