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A ferritic steel plate strengthened by nano-scale spherical cementite and its preparation method

A ferrite and cementite technology, applied in the field of metallurgy, can solve the problems of inability to meet the impact resistance of the transportation and manufacturing industry, inability to industrially promote, and high processing costs, and achieves suppression of migration and growth. The effect of good processability

Inactive Publication Date: 2017-06-13
NORTHEASTERN UNIV LIAONING +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yield strength and tensile strength of ordinary ferritic steel can be increased to 150MPa and 320MPa respectively after microalloying (Jing Cainian, Wang Zuocheng, Han Futao, Zhang Wenping, Yi Yanhong, hot-rolled Ti-IF steel in ferritic area Microstructure and properties of special steel, Volume 2, 23-25 ​​(2006)), however, its low strength cannot meet the requirements of the transportation and manufacturing industry for impact resistance and low specific mass
[0013] 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-containing ferritic 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 is high, because 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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  • A ferritic steel plate strengthened by nano-scale spherical cementite and its preparation method
  • A ferritic steel plate strengthened by nano-scale spherical cementite and its preparation method
  • A ferritic steel plate strengthened by nano-scale spherical cementite and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Nanoscale spherical cementite strengthened ferritic steel plate, chemical composition by mass percentage: Cr: 1.05%, Mo: 1.00%, Mn: 0.72%, Ni: 0.60%, Al: 0.45%, C: 0.42%, The balance is Fe and unavoidable impurities; the microstructure of the ferritic steel plate is equiaxed ferrite grains, nano-scale spherical cementite is dispersed in the ferrite grain boundary area, and the diameter of the grains is 0.4-0.5 μm , the size of nano-scale spherical cementite is 70-80nm; the thickness of ferritic steel plate is 1.7mm.

[0048] The preparation method of the nanoscale spherical cementite strengthened ferritic steel plate comprises the following steps:

[0049] Step 1, smelting:

[0050] According to the chemical composition of the nano-scale spherical cementite-strengthened ferritic steel sheet, it is melted under the protection of argon at a melting temperature of 1500 ° C, and cast into an ingot;

[0051] The impurity components in the ingot are as follows: Cu: 0.02%, S...

Embodiment 2

[0064] Nano-scale spherical cementite strengthened ferritic steel plate, chemical composition by mass percentage: Cr: 1.00%, Mo: 0.97%, Mn: 0.75%, Ni: 0.57%, Al: 0.52%, C: 0.45%, The balance is Fe and unavoidable impurities; the microstructure of the ferritic steel plate is equiaxed ferrite grains, nano-scale spherical cementite is dispersed in the ferrite grain boundary area, and the diameter of the grains is 0.5-0.6 μm , the size of nano-scale spherical cementite is 90-100nm; the thickness of ferritic steel plate is 2mm.

[0065] The preparation method of the nanoscale spherical cementite strengthened ferritic steel plate comprises the following steps:

[0066] Step 1, smelting:

[0067] According to the chemical composition of the nano-scale spherical cementite-strengthened ferritic steel sheet, it is melted under the protection of argon at a melting temperature of 1525°C and cast into an ingot;

[0068] The impurity components in the ingot are as follows: Cu: 0.03%, Si: ...

Embodiment 3

[0081] Nanoscale spherical cementite strengthened ferritic steel plate, chemical composition by mass percentage: Cr: 1.00%, Mo: 0.97%, Mn: 0.75%, Ni: 0.57%, Al: 0.37%, C: 0.39%, The balance is Fe and unavoidable impurities; the microstructure of the ferritic steel plate is equiaxed ferrite grains, nano-scale spherical cementite is dispersed in the ferrite grain boundary area, and the diameter of the grains is 2 to 3 μm. The size of nanoscale spherical cementite is 130-150nm; the thickness of ferritic steel plate is 1.4mm.

[0082] The preparation method of the nanoscale spherical cementite strengthened ferritic steel plate comprises the following steps:

[0083] Step 1, smelting:

[0084] According to the chemical composition of the nano-scale spherical cementite-strengthened ferritic steel sheet, it is melted under the protection of argon at a melting temperature of 1550 ° C, and cast into an ingot;

[0085] The impurity components in the ingot are as follows: Cu: 0.01%, Si...

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Abstract

The invention relates to a ferritic steel plate with a nanaoscale spherical cementite enhancing function and a preparation method of the ferritic steel plate. The steel plate is prepared from, by mass percent, 0.95%-1.05% of Cr, 0.95%-1.00% of Mo, 0.68%-0.75% of Mn, 0.57%-0.62% of Ni, 0.37%-0.52% of Al, 0.39%-0.45% of C and the balance Fe and inevitable impurities. The microstructure of the ferritic steel plate is equiaxed ferritic grains, nanaoscale spherical cementite is dispersed and distributed in the ferritic grain boundary region, the diameter of the grains ranges from 0.4 micrometer to 3 micrometers, and the size of the nanaoscale spherical cementite ranges from 70 nm to 150 nm; and the thickness of the ferritic steel plate ranges from 1.4 mm to 2.0 mm. The preparation method comprises the steps that 1, smelting is carried out under gas shield; 2, hot rolling is carried out after solid solution treatment; 3, warm rolling is carried out after heat treatment; and 4, annealing is carried out to obtain the finished steel plate. According to the steel plate, the yield strength and tensile strength of the steel plate are improved, and the good machining performance and plastic deformation capacity are achieved. The preparation method is simple, and industrial production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a nano-spherical cementite-strengthened ferrite steel plate 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. Currently, the development of steel for industrial use is mainly focused on increasing the strength of the steel while maintaining its formability. New design concepts for the development of lightweight, impact-resistant transport systems require the development of materials with high strength and excellent energy absorption capacity, as well as low specific masses. Increasing the strength can reduce the weight (to meet the needs of energy saving and environmental protection), while improving the plasticity can meet the sha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/12C22C38/04C22C38/08C22C38/06C21D8/02
CPCC21D8/0226C21D8/0231C21D8/0247C21D2211/003C21D2211/005C22C38/04C22C38/06C22C38/08C22C38/12C22C38/18
Inventor 申勇峰王鹏杰冯晓伟杨世全
Owner NORTHEASTERN UNIV LIAONING
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