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Subboundary-reinforced high-strength interstitial free steel containing Ti, and preparation method thereof

An interstitial-free steel and high-strength technology, applied in the field of metallurgy, can solve the problems of low specific mass, low strength, and high processing costs, and achieve strong dislocation absorption capacity, high room temperature tensile strength, and good plastic deformation capacity. Effect

Active Publication Date: 2014-01-29
NORTHEASTERN UNIV
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  • Abstract
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Problems solved by technology

The yield strength and tensile strength of ordinary IF steel can be increased by 150MPa and 320MPa respectively after microalloying (Jing Cainian, Wang Zuocheng, Han Futao, Zhang Wenping, Yi Yanhong, Microstructure of hot-rolled Ti-IF steel in ferrite zone and Properties, Special Steels, Volume 2, 23-25 ​​(2006)), however, its low strength cannot meet the requirements of the automotive industry for impact resistance and low specific mass
[0008] German scientists Rana et al. (R. Rana, W. Bleck, S.B. Singh, O.N. Mohanty., Development of high strength interstitial free steel by copper precipitation hardening, Materials Letters, Vol. 61, 2919-2922(2007)) through vacuum melting - The yield strength of the IF steel prepared by the hot rolling-aging treatment method is ~456MPa, and the tensile strength is ~566MPa. However, since this method needs to add 1.16% of the metal element Cu, the cost of the IF steel will inevitably increase, which is not conducive to the market compete
[0009] Cooperation between scientists from Turkey, the United States and Germany (O. Saray, G. Purcek, I. Karaman, T. Neindorf, H.J. Maier, Equal-channel angular sheet extrusion of interstitial-free (IF) steel: Microstructural evolution and mechanical properties, Mater. Sci. Eng. A, Vol.528, 6573-6583(2011)), the Ti-IF steel prepared by vacuum melting-hot rolling-equal channel extrusion technology has a yield strength of 459MPa and a tensile strength of 463MPa, but the processing cost Moreover, the sample size prepared by the technology used can only meet the needs of laboratory research and cannot be used for industrial promotion

Method used

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  • Subboundary-reinforced high-strength interstitial free steel containing Ti, and preparation method thereof
  • Subboundary-reinforced high-strength interstitial free steel containing Ti, and preparation method thereof
  • Subboundary-reinforced high-strength interstitial free steel containing Ti, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The chemical composition of the sub-grain boundary strengthened high-strength titanium-containing non-interstitial atom steel of this embodiment is as follows by weight percentage: Mn 0.14%, Ti 0.10%, and the balance is Fe and unavoidable impurities.

[0037] The method for preparing the above-mentioned sub-grain boundary strengthened high-strength titanium-containing interstitial atom-free steel is carried out according to the following steps:

[0038] (1) According to weight percentage, Mn0.14%, Ti0.10%, the balance is Fe. Put metallic Fe, metallic Mn and metallic Ti in a smelting furnace, smelt under protective gas, and then cast into ingots ;

[0039] The impurity components in the ingot are Ni0.01%, Cu0.04%, Si0.176%, Al0.002%, Nb0.019%, V0.075%, Co0.019%, P0.018% in weight percentage, B0.004%, W0.028%, N0.002%, S0.007%;

[0040] (2) Heat the ingot to 1040°C for 1 hour for solution treatment, perform hot rolling at 840°C, with a deformation of 63%, and control the final r...

Embodiment 2

[0045] The chemical composition of the sub-grain boundary strengthened high-strength titanium-containing non-interstitial atom steel in this embodiment is as follows by weight percentage: Mn 0.16%, Ti 0.09%, and the balance is Fe and unavoidable impurities.

[0046] The method for preparing the above-mentioned sub-grain boundary strengthened high-strength titanium-containing interstitial atom-free steel is carried out according to the following steps:

[0047] (1) According to weight percentage, Mn0.16%, Ti0.09%, the balance is Fe. Put metallic Fe, metallic Mn and metallic Ti in a smelting furnace, smelt under protective gas, and then cast into ingots ;

[0048] The impurity components in the ingot are Ni0.02%, Cu0.03%, Si0.176%, Al0.003%, Nb0.021%, V0.079%, Co0.014%, P0.015%, B0 in weight percentage .003%, W0.026%, N0.003%, S0.006%;

[0049] (2) Heat the ingot to 1050°C for 1.2h for solution treatment, perform hot rolling at 850°C, with a deformation of 70%, and control the final ro...

Embodiment 3

[0054] The chemical composition of the sub-grain boundary strengthened high-strength titanium-containing non-interstitial atom steel in this embodiment is as follows by weight percentage: Mn 0.12%, Ti 0.08%, and the balance is Fe and unavoidable impurities.

[0055] The method for preparing the above-mentioned sub-grain boundary strengthened high-strength titanium-containing interstitial atom-free steel is carried out according to the following steps:

[0056] (1) According to the weight percentage, Mn0.12%, Ti0.08%, the balance is Fe. Put metallic Fe, metallic Mn and metallic Ti in a smelting furnace, smelt under protective gas, and then cast into ingots ;

[0057] The impurity components in the ingot are Ni0.03%, Cu0.03%, Si0.16%, Al0.004%, Nb0.027%, V0.065%, Co0.013%, P0.018%, B0 .008%, W0.029%, N0.002%, S0.007%;

[0058] (2) Heat the ingot to 1060°C and hold for 1.5h for solution treatment, perform hot rolling at 860°C, with a deformation of 72%, and control the final rolling tem...

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Abstract

The invention belongs to the field of metallurgical technology, and especially relates to subboundary-reinforced high-strength interstitial free steel containing Ti, and a preparation method thereof. The subboundary-reinforced high-strength interstitial free steel comprises 0.12 to 0.16wt% of Mn, 0.08 to 0.10wt% of Ti, the balance Fe and unavoidable impurities. Tensile strength is 540 to 710MPa, and yield strength is 510 to 600MPa. Microstructure of the subboundary-reinforced high-strength interstitial free steel containing Ti is formed by equiaxed ferritic grains, diameter of the equiaxed ferritic grains ranges from 20 to 30 <mu>m, separation distance between geometrically necessary dislocation boundaries ranges from 300 to 500nm, and the size of a cellular structure ranges from 400 to 800nm. The preparation method comprises following steps: Fe, Mn and Ti are subjected to melting and casting so as to obtain ingot casting; the ingot casting is subjected to solution treatment, and hot rolling so as to obtain hot rolled plates; thin steel plates are obtained after further processing; and the thin steel plates are subjected to annealing treatment so as to obtain the subboundary-reinforced high-strength interstitial free steel containing Ti. The subboundary-reinforced high-strength interstitial free steel containing Ti possesses high strength and relatively excellent plasticity and deformability, and possesses significant values for development of the fields of rapid developed automobile industry and machine building industry.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to a sub-grain boundary strengthened high-strength Ti-containing steel without interstitial atoms and a preparation method thereof. Background technique [0002] Steel is the most widely used material among all metals. It is widely used in aviation, nuclear energy, ships, petrochemical and other industrial fields. The performance of steel is closely related to people's life safety. At present, the development of steel for the automotive industry is mainly devoted to improving the strength of steel and maintaining its formability. The new design concept for the development of lightweight and impact-resistant transportation system requires the development of materials with high strength, excellent energy absorption capacity, and lighter than mass. Increasing the strength can reduce the weight of the car (meeting the needs of energy conservation and environmental protection),...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
Inventor 申勇峰徐天帅赵宪明左良
Owner NORTHEASTERN UNIV
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