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Nano-structured ultrahigh-strength dual-phase steel and production method thereof

An ultra-high-strength, nano-structured technology, applied in the direction of manufacturing tools, heat treatment baths, quenching agents, etc., can solve the problems of complex process, limited improvement of toughness and plasticity, etc., achieve simple heat treatment process, improve strength and toughness, and short heat treatment cycle Effect

Inactive Publication Date: 2012-05-23
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantage is that multiple times of salt bath medium heat treatment are required, and the process is relatively complicated; moreover, the volume fraction of retained austenite obtained is generally less than 10%, which has limited improvement in toughness and plasticity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A nanostructured ultra-high-strength dual-phase steel and a manufacturing method thereof. First austenitize the billet at 900-1050°C for 0.2-0.5 hours; then quench it in a water bath at 50-100°C and keep it warm for 4.0-10.0 minutes; Distribution + tempering, the time is 0.4 to 1.0 hours; finally water quenched to room temperature.

[0021]The chemical composition and content of the billet are: C is 0.71-0.90wt%, Si is 1.00-1.50wt%, Mn is 1.50-2.00wt%, Cr is 1.00-1.60wt%, Mo is 0.05-0.60wt%, Al 0.05~0.60wt%, Nb 0.05~0.2wt%, Ti 0.05~0.2wt%, V 0.05~0.2wt%, P<0.015wt%, S<0.010wt%, the rest is Fe and unavoidable Impurities; wherein, Si+Mn+Cr+Mo+Al≤6.00wt%, Nb+Ti+V≤0.30wt%.

[0022] The tensile strength of the ultra-high-strength nanostructure dual-phase steel produced in this embodiment is 1800-2300MPa, the hardness is 550-640HV, the elongation is 20-30%, and the fracture toughness is 25-35MPam 1 / 2 Ultra-high-strength nanostructured dual-phase steel.

Embodiment 2

[0024] A nanostructured ultra-high-strength dual-phase steel and a manufacturing method thereof. First austenitize the billet at 870-1020°C for 0.25-0.55 hours; then quench it in a water bath at 20-80°C and keep it warm for 3.0-9.0 minutes; then in a weak reducing atmosphere at 350-600°C Carry out carbon distribution + tempering, the time is 0.2-0.7 hours; finally water quenching to room temperature.

[0025] The chemical composition and content of the billet are: C is 0.75-0.95wt%, Si is 1.50-2.00wt%, Mn is 1.00-1.50wt%, Cr is 1.00-1.60wt%, Mo is 0.40-1.00wt%, Al 0.40-1.00wt%, Nb 0.05-0.2wt%, Ti 0.05-0.2wt%, P<0.015wt%, S<0.010wt%, the rest is Fe and unavoidable impurities; among them, Si+Mn+ Cr+Mo+Al≤6.00wt%, Nb+Ti≤0.30wt%.

[0026] The tensile strength of the ultra-high-strength nanostructure dual-phase steel produced in this embodiment is 2100-2500MPa, the hardness is 600-680HV, the elongation is 17-27%, and the fracture toughness is 23-33MPam 1 / 2 Ultra-high-strength na...

Embodiment 3

[0028] A nanostructured ultra-high-strength dual-phase steel and a manufacturing method thereof. First austenitize the billet at 850-1000°C for 0.3-0.6 hours; then quench it in a water bath at 0-60°C and keep it warm for 1.0-7.0 minutes; then proceed in a salt bath at 330-530°C Carbon distribution + tempering, the time is 0.01 to 0.65 hours; finally water quenching to room temperature.

[0029] The chemical composition and content of the billet are: C is 0.80-1.00wt%, Si is 1.20-1.70wt%, Mn is 1.30-1.80wt%, Cr is 1.00-1.60wt%, Mo is 0.10-0.60wt%, Al 0.10-0.60wt%, Ti 0.05-0.2wt%, V 0.05-0.2wt%, P<0.015wt%, S<0.010wt%, the rest is Fe and unavoidable impurities; among them, Si+Mn+ Cr+Mo+Al≤5.00wt%, Ti+V≤0.30wt%.

[0030] The tensile strength of the ultra-high-strength nanostructure dual-phase steel produced in this embodiment is 2150-2550 MPa, the hardness is 630-700 HV, the elongation is 15-25%, and the fracture toughness is 20-30 MPam 1 / 2 Ultra-high-strength nanostructured d...

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Abstract

The invention relates to nano-structured ultrahigh-strength dual-phase steel and a production method thereof. The production method comprises the following steps: austenitizing steel billet at 850-1,050 DEG C for 0.2-0.6 hour; water-bath quenching at 0-100 DEG C, and holding the temperature for 1.0-10.0 minutes; performing carbon distribution and tempering at 300-600 DEG C for 0.01-1.0 hour; and fnally quenching with water to room temperature. The medium for carbon distribution and tempering is one of salt bath, inert gas atmosphere and weak reducing atmosphere. The steel billet comprises thefollowing chemical components in percentage by weight: C 0.71-1.00, Si 1.00-2.00, Mn 1.00-2.00, Cr 1.00-1.60, Mo 0.05-1.00, Al 0.05-1.00, Nb 0.00-0.2, Ti 0.00-0.2%, V 0.00-0.2%, P less than 0.015%, Sless than 0.010%, and Fe and unavoidable impurities as balance, wherein the sum of the contents of Si, Mn, Cr, Mo and Al is less than or equal to 6.00%, and the sum of the contents of Nb, Ti and V isless than or equal to 0.30%. The production method provided by the invention has the characteristics of low cost, simple process and short heat treatment cycle; and the produced steel plate has good properties and wide application range.

Description

technical field [0001] The invention belongs to the technical field of ultra-high strength steel. In particular, it relates to a nanostructured ultra-high-strength dual-phase steel and a manufacturing method thereof. Background technique [0002] It is generally believed that the tensile strength exceeds 1500N / mm 2 The alloy structural steel is ultra-high strength steel. Ultra-high-strength steel is developed on the basis of alloy structural steel. Through special alloy composition and heat treatment process design, it has reached an ultra-high strength level. It is mainly used to manufacture aircraft landing gear and main beams, and solid rocket motor shells. , high-speed centrifuge rotating cylinder and other structural components subjected to high stress. Traditional ultra-high-strength steels are usually classified according to chemical composition and strengthening mechanism: [0003] (1) Low-alloy ultra-high-strength steel is developed on the basis of alloy quenche...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C22C38/34C22C38/38C21D1/18
CPCC22C38/34C21D6/00C22C38/04C21D2211/001C22C38/22C21D2211/008C22C38/06C21D1/25C22C38/26C21D6/002C22C38/02C21D6/008C21D1/46C22C38/28C21D1/60C22C38/38C22C38/24
Inventor 吴开明胡锋万进邱金鳌郑花
Owner WUHAN UNIV OF SCI & TECH
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