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Ultrafine grained dual-phase steel material and production method thereof

An ultra-fine-grain, dual-phase steel technology, applied in the field of metal materials, can solve the problems of low tensile strength and yield strength, and achieve high strength, strong corrosion resistance, and superior wear and corrosion resistance.

Active Publication Date: 2013-08-21
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem of low tensile strength and yield strength of steel existing in the prior art, the present invention provides an ultra-fine-grained dual-phase steel material and a preparation method thereof, the purpose of which is to make the prepared There are a large number of martensitic structures and submicron ultrafine grains in hot-rolled steel materials, and there are nanoscale twinned lamellar structures at the same time. Certain plastic deformation ability

Method used

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  • Ultrafine grained dual-phase steel material and production method thereof
  • Ultrafine grained dual-phase steel material and production method thereof
  • Ultrafine grained dual-phase steel material and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] Fe-(13.5~14.5)Cr-(2.3~2.7)Mn-(6.1~6.9)Ni-(0.01~0.03)C is used as the basic alloy composition for batching, and the composition range of other trace alloy elements is: (0.023 ± 0.002 )V, (0.075 ± 0.015 )Mo, the alloy material was smelted in a vacuum induction furnace, and the inert gas Ar was introduced into the furnace as a protective gas, and the smelted molten steel was cast and heated to 1150°C, kept for 1h, and the ingot was opened The billet is made into a square billet with a cross-section of 100 mm×100 mm, and the hot rolling is controlled by two stages. The hot rolling temperature in the first stage is 1050 °C, which is the austenite recrystallization temperature, and the hot rolling temperature in the second stage is 820 °C, which is The austenite non-recrystallization temperature, the relative reductions in the two stages are 35% and 15% respectively, and the plate thickness is 8 mm after 6 passes. Rapid cooling at a rate of 50°C / s, cooling to 650°C, heat pres...

Embodiment 2

[0035] Fe-(13.5~14.5)Cr-(2.3~2.7)Mn-(6.1~6.9)Ni-(0.01~0.03)C is used as the basic alloy composition for batching, and the composition range of other trace alloy elements is: (0.023 ± 0.002 )V, (0.075 ± 0.015 )Mo, the alloy material was smelted in a vacuum induction furnace, and the inert gas Ar was introduced into the furnace as a protective gas, and the smelted molten steel was cast and heated to 1150°C, kept for 1h, and the ingot was opened The billet is made into a square billet with a cross-section of 100 mm×100 mm, and the hot rolling adopts two-stage controlled rolling. The hot rolling temperature of the first stage is 1150 °C, which is the austenite recrystallization temperature, and the hot rolling temperature of the second stage is 950 °C, which is The austenite non-recrystallization temperature, the relative reductions in the two stages are 35% and 15% respectively, and the plate thickness is 8 mm after 6 passes. Rapid cooling at a rate of 80°C / s, cooling to 650°C, h...

Embodiment 3

[0041] Fe-(13.5~14.5)Cr-(2.3~2.7)Mn-(6.1~6.9)Ni-(0.01~0.03)C is used as the basic alloy composition for batching, and the composition range of other trace alloy elements is: (0.023 ± 0.002 ) V, (0.075 ± 0.015 ) Mo, the alloy material was smelted in a vacuum induction furnace, and the inert gas Ar was introduced into the furnace as a protective gas, and the smelted molten steel was cast into an ingot and heated to 1150 ° C, kept for 1 hour, and the ingot was opened The billet is made into a square billet with a cross-section of 100 mm×100 mm. The hot rolling adopts two-stage controlled rolling. The hot rolling temperature in the first stage is 1100 °C, which is the austenite recrystallization temperature, and the hot rolling temperature in the second stage is 900 °C, which is The austenite non-recrystallization temperature, the relative reductions in the two stages are 35% and 15% respectively, and the plate thickness is 8mm after 6 passes. Rapid cooling at a rate of 80°C / s, co...

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Abstract

The invention belongs to the technical field of metal materials, and particularly relates to ultrafine grained dual-phase steel material and a production method thereof. The ultrafine grained dual-phase steel material comprises, in weight percentage, 13.5-14.5% of Cr, 6.1-6.9% of Ni, 2.3-2.7% of Mn, 0.33-0.37% of Si, 0.60-0.90% of Cu, 0.10-0.03% of C, 0.021-0.025% of V, 0.60-0.90% of Mo, 0.02% ofP, 0.04% of S and the balance of Fe. The microstructure of the ultrafine grained dual-phase steel material is formed by coaxial ultrafine grains distributed in random orientation, the diameter of each grain is 500-2000 nanometers, microstructure of each grain is formed by austenite and martensite, yield strength of the steel material at room temperature is 1100-1600MPa, tensile strength of the steel material is 1200-1850MPa, and elongation of the steel material is 10-20%. By reasonable component design and process control, the produced hot-rolled steel material has martensitic structure, submicron ultrafine grains and nano-scale twin-lamella structure, and the structures cooperate together so that the steel material has ultrahigh strength and certain plastic deformation.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to an ultrafine-grain dual-phase steel material and a preparation method thereof. Background technique [0002] Steel is the most versatile of all metals, with applications in industries ranging from aerospace to nuclear energy to naval and petrochemical. At present, the total tonnage of world shipbuilding orders is 356.3 million tons. Chinese shipyards account for 69.4% of the world's total water transportation equipment construction, and South Korea only accounts for 23%. It is a big country, but it is not the number one shipbuilding power, mainly because it is restricted by high-performance steel materials. Compared with steel for civil large ships, the special features of steel for aircraft carrier mainly include: seawater corrosion resistance; antimagnetic; high temperature resistance, high strength, toughness and good welding performance, etc. In recent years, develo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C33/04C21D8/02C21D1/26
Inventor 申勇峰李晓旭薛文颖
Owner NORTHEASTERN UNIV LIAONING
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