Nitrogen intensified high-carbon twin crystal inducement plastic steel material and its production technique

A technology of twinning induced plasticity and iron and steel materials, applied in temperature control, manufacturing tools, heat treatment equipment, etc., can solve the problems of difficult industrial production of TWIP steel and affecting the quality of galvanizing of cold-rolled sheets, and achieves low cost and simple preparation method , good application prospects

Inactive Publication Date: 2009-05-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the composition of traditional TWIP steel is Fe-25Mn-3Al-3Si-0.03C (Document 1: Georg Frommeyer, Udo Brux, PeterNeumann.Supra-ductile and high-strength manganese-TRIP/TWIP steels for high energy absorption purposes, ISIJ International , V43(2003) 3: 438-446.) Among them, the Al content is relatively high, because Al

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Using traditional vacuum smelting and hot rolling, cold rolling process to prepare steel plate

[0022] Smelting process: Vacuum smelting in an electromagnetic induction furnace, filled with argon for protection. C%: 0.52wt%, Mn%: 23.77wt%, N%: 0.088wt%, S%<0.008wt%, P%<0.02wt%, Al%: <1wt%, Si%<1wt%, balance It is Fe.

[0023] Rolling process: the heating temperature of the steel material is 1200°C, and the heat preservation is 3 hours for homogenization treatment. Hot rolled on a 350 two-roll hot rolling mill to obtain a hot-rolled sheet with a thickness of about 2.5 to 3.5mm, with a total deformation of 80 to 90%. The starting and finishing temperatures are 1100°C and 950°C respectively. Cold rolling on a roll cold rolling mill, and cold rolling to a test sheet with a thickness of 1.0 mm.

[0024] 2. Heat treatment process: 1.0mm thick cold-rolled steel plate is kept in a heating furnace at 700°C for 10 minutes, and then cooled to room temperature at a cooling r...

Embodiment 2

[0028] The difference from Example 1 lies in: the control of the heat treatment temperature, only the heat treatment temperature is controlled at 700°C, kept for more than 20 minutes, and cooled to room temperature at a cooling rate of 30°C / s.

[0029] Under the same process conditions, high-strength, high-plastic twin-induced plasticity steel is also prepared. The steel material also has a microstructure of annealing twins and stacking faults in the austenite matrix observed by a transmission electron microscope, and its grain size is 2- 5 μm. The mechanical properties of the steel material at room temperature: yield strength 515MPa, tensile strength 1020MPa, elongation 71%.

Embodiment 3

[0031] 1. Using traditional vacuum smelting and hot rolling, cold rolling process to prepare steel plate

[0032] Smelting process: Vacuum smelting in an electromagnetic induction furnace, filled with argon for protection. C%: 0.57wt%, Mn%: 29.14wt%, N%: 0.18wt%, S%<0.008wt%, P%<0.02wt%, Al%: <1wt%, Si%<1wt%, balance It is Fe.

[0033] Rolling process: the heating temperature of the steel material is 1200°C, and the heat preservation is 3 hours for homogenization treatment. Hot rolled on a 350 two-roll hot rolling mill to obtain a hot-rolled sheet with a thickness of about 2.5 to 3.5mm, with a total deformation of 80 to 90%. The starting and finishing temperatures are 1100°C and 950°C respectively. Cold rolling on a roll cold rolling mill, and cold rolling to a test sheet with a thickness of 1.0 mm.

[0034] 2. Heat treatment process: 1.0mm thick cold-rolled steel plate is kept in a heating furnace at 700°C for 10 minutes, and then cooled to room temperature at a cooling ra...

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Abstract

The invention relates to a technology for improving an iron and steel metallic material, in particular to a nitrogen-strengthened high-carbon twin-crystal induced plastic steel material and a method for preparing the same. The steel material is characterized by comprising the following component ranges: 0.2 to 1.0 percent of C, 15 to 35 percent of Mn, 0.04 to 0.2 weight percent of nitrogen content in control, less than 1 weight percent of Al, less than 1 weight percent of Si, less than 0.008 percent of S, less than 0.02 percent of P, and the balance being Fe. The stacking fault energy is controlled to between 20 and 60 mJ.mm<2>. The technology can obtain the proportions of strength and plasticity of different levels through process control so as to obtain the tensile strength of between 995 and 1,530MPa, the yield strength of between 470 and 1,340 MPa and the specific elongation of between 13 to and 71.5 percent. The steel material does not have a turning point of the flexible brittleness. The high-strength high-plasticity steel materials prepared by the technology can be used in the industries such as railway steel rail, saloon sedan manufacturing, engineering machinery, oil-gas delivering pipeline and liquefied natural gas container, military industry, and have important value and great application space.

Description

technical field [0001] The invention belongs to the field of iron and steel material preparation, and relates to a nitrogen-enhanced high-carbon twinning-induced plastic iron and steel material and a preparation method thereof Background technique [0002] Twin-induced plasticity steel is a pure austenitic carbon steel mainly composed of Fe and Mn. After annealing, the structure at room temperature is austenite, accompanied by a small amount of flaky annealing twins and stacking faults. After stretching, the grains A large number of mechanical twins are generated inside, and the plasticity is induced by hindering the movement of dislocations through the twin boundaries, so that the matrix has high ductility and high plasticity. [0003] In recent years, research on the superior high strength (600-1200MPa), high plasticity (maximum elongation up to 95%), and high toughness (-196°C steel has a total strain of 65%) of twin-induced plasticity steel has made a kind of New means ...

Claims

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Application Information

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IPC IPC(8): C22C38/06B21B37/74C21D9/52
Inventor 米振莉唐荻江海涛代永娟吕建崇
Owner UNIV OF SCI & TECH BEIJING
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