Directional solidification high-boron high-vanadium high-speed steel and production method thereof

A technology of directional solidification and high-speed steel, which is applied in the manufacture of tools, casting equipment, metal processing equipment, etc., can solve the problems of high brittleness of eutectic boron carbide, high brittleness of high-boron high-speed steel, and easy peeling of hot rolls, etc., to achieve Uniform distribution, reducing internal stress, and improving filling performance

Active Publication Date: 2021-11-30
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

High-boron high-speed steel has high hardness, but the eutectic boron carbide itself is brittle, has a coarse structure, and is distributed in the matrix in a network sha

Method used

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  • Directional solidification high-boron high-vanadium high-speed steel and production method thereof
  • Directional solidification high-boron high-vanadium high-speed steel and production method thereof
  • Directional solidification high-boron high-vanadium high-speed steel and production method thereof

Examples

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Example Embodiment

[0042] A directional solidification method for preparing high-boron high vanadium high speed steel, directional solidification preparation process, better control of grain-oriented solidification structure, forming a continuous columnar grain structure, the following steps:

[0043] Sl, the pig iron, scrap, low carbon ferrochrome, ferromanganese, boron, iron, vanadium iron, pure iron, molybdenum, tungsten, iron, ferrosilicon as the raw material melting furnace smelting were added, followed by addition of 0.148 in the bottom of the ~ 0.152g aluminum wire deoxy, dideoxy method using the hearth, the molten steel melted down after the hot pack, at the bottom of argon refining 8 ~ 15min, to obtain component passing clean high boron impurity-free steel, high vanadium high speed steel used for step S2;

[0044] Material i.e. pig iron, scrap, low carbon ferrochrome, ferromanganese, boron, iron, vanadium iron, pure iron, molybdenum, tungsten, iron, ferrosilicon, ferrotitanium, the mass fra...

Example Embodiment

[0056] Example 1

[0057] Preparation of directionally solidified specimens

[0058]The present invention selects pig iron, scrap, low carbon chrome, manganese iron, boron iron, vanadium iron, industrial pure iron, molybdenum iron, tungsten iron, silicon iron, titanium iron alloy as raw materials. The 25.176% of scrap steel (chemical composition of scrap and its mass fraction of 0.300% C, 0.300% Si, 0.500% Mn, the margin is Fe), 41.852% of the pure iron (the chemical composition mass fraction of the pure iron is 0.003% C, 0.020% Si, 0.150% Mn, the margin is Fe), 1.038% manganese iron (the mass fraction of manganese iron is 6.410% C, 1.630% Si, 65.900% Mn, the remaining amount is Fe), 0.463% silicon ( The chemical component mass fraction of silicon iron is 0.100% C, 73.100% Si, the remaining amount is Fe), 4.893% of the pig iron (the mass fraction of the chemical composition of pig iron is 4.270% C, 0.900% Si, 0.113% Mn, the margin is Fe) 8.520% low carbon chromium (low carbon chro...

Example Embodiment

[0062] Example 2

[0063] Directional solidification test

[0064] The present invention selects pig iron, scrap, low carbon chrome, manganese iron, boron iron, vanadium iron, industrial pure iron, molybdenum iron, tungsten iron, silicon iron, titanium iron alloy as raw materials. The 25.177% of scrap steel (chemical composition of scrap steel and the mass fraction of 0.300% C, 0.300% Si, 0.500% Mn, the remaining amount is Fe), 41.852% of the pure iron (the chemical composition mass fraction of the pure iron is 0.003% C, 0.020% Si, 0.150% Mn, the margin is Fe), 1.038% manganese iron (the mass fraction of manganese iron is 6.410% C, 1.630% Si, 65.900% Mn, the remaining amount is Fe), 0.463% silicon ( The chemical component mass fraction of silicon iron is 0.100% C, 73.100% Si, the remaining amount is Fe), 4.893% of the pig iron (the mass fraction of the chemical composition of pig iron is 4.270% C, 0.900% Si, 0.113% Mn, the margin is Fe) 8.520% low carbon chromium (low carbon chrom...

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Abstract

The invention discloses directional solidification high-boron high-vanadium high-speed steel and a production method thereof. The production method of the directional solidification high-boron high-vanadium high-speed steel comprises the following steps: with pig iron, waste steel, low-carbon ferrochrome, ferromanganese, ferroboron, ferrovanadium, industrial pure iron, ferromolybdenum, ferrotungsten, ferrosilicon and/or ferrotitanium as raw materials, conducting smelting treatment at the temperature of 1580-1600 DEG C, and then conducting refining treatment to obtain molten high-boron high-vanadium high-speed steel; and subjecting the molten high-boron high-vanadium high-speed steel to overheating heat preservation treatment, then controlling the pouring temperature to be 1420-1430 DEG C for directional solidification treatment, and waiting for the temperature to drop to the room temperature to obtain the directional solidification high-boron high-vanadium high-speed steel. The high-boron high-vanadium high-speed steel is produced by adopting a directional solidification technology, and the grain orientation of a solidification structure can be well controlled through the directional solidification technology, so that the high-boron high-speed steel presents certain orientation, a continuous columnar crystal structure is formed, thus various kinds of performance of the material is greatly improved, and compared with common high-boron high-speed steel, the high-boron high-speed steel has better performance.

Description

technical field [0001] The invention belongs to the technical field of directionally solidified metal wear-resistant materials, and in particular relates to a directionally solidified high-boron and high-vanadium high-speed steel and a preparation method thereof. Background technique [0002] High-speed steel is an early and widely used wear-resistant material. It is mainly composed of two basic components: one is the hard phase carbide, which makes the high-speed steel wear better; the other is the metal wrapped around the carbide. Matrix, which makes high-speed steel have better toughness and ability to absorb impact. Among the alloying elements of high-speed steel, vanadium has a significant impact on high-speed steel. Vanadium is beneficial to the formation of MC-type carbides, and it also significantly promotes lamellar M 2 Formation of C-type carbides against skeletal M 6 The formation of C-type carbides, thereby improving the wear resistance of high-speed steel. T...

Claims

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Application Information

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IPC IPC(8): C22C33/06B22D27/04C22C38/32C22C38/02C22C38/04C22C38/22C22C38/28C22C38/06C22C38/24B22D46/00C21C7/06C21C7/072
CPCC22C33/06B22D27/045C22C38/32C22C38/02C22C38/04C22C38/22C22C38/28C22C38/06C22C38/24B22D46/00C21C7/06C21C7/072B22D29/00
Inventor 马胜强郭鹏佳邢建东檀旭吕萍付沙沙
Owner XI AN JIAOTONG UNIV
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