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Powder metallurgy high-toughness cold-work mould steel and preparation method thereof

A cold work die steel and powder metallurgy technology, applied in the field of iron-based alloys, can solve the problem of high production cost, achieve the effects of fine MC carbide, uniform steel structure, and improved nucleation rate

Active Publication Date: 2015-04-29
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the high content of V and Nb in this cold work die steel, the production cost is high

Method used

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  • Powder metallurgy high-toughness cold-work mould steel and preparation method thereof
  • Powder metallurgy high-toughness cold-work mould steel and preparation method thereof
  • Powder metallurgy high-toughness cold-work mould steel and preparation method thereof

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Embodiment Construction

[0034] In the following, the cold work die steel of the present invention and its preparation method will be further explained in detail in combination with examples. In this specification, the content of alloying elements in steel is expressed in mass percentage, unless otherwise specified.

[0035] In the cold work die steel of the present invention, a certain amount of element Nb is added together with a certain amount of element V. As mentioned above, the function of Nb is to reduce the nucleation barrier of MC carbides and promote the formation of finer MC carbides, thereby improving the toughness of the steel of the present invention.

[0036] In order to achieve satisfactory overall performance, each alloy composition in the steel of the present invention should be controlled within the range given above, and the function of each alloy element in the present invention will be described in detail below.

[0037] C: C is one of the constituent elements of MC carbide, the...

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Abstract

The invention belongs to the technical field of iron-base alloy containing vanadium or niobium, and provides powder metallurgy high-toughness cold-work mould steel. The powder metallurgy high-toughness cold-work mould steel comprises the following chemical components in percentage by mass: 2.5%-6.0% of V, 0.2%-2.5% of Nb, 0.5%-2.0% of C, less than or equal to 2.0% of Si, 0.2%-1.5% of Mn, 4.0%-5.6% of Cr, less than or equal to 3.0% of Mo and the balance of iron and inevitable impurities, wherein Nb in the cold-work mould steel does not exist in the form of a NbC phase and is dissolved in a MC-type carbide phase formed by V, the MC-type carbide phase is at a dispersion distribution state, and the volume fraction of the MC-type carbide phase in the cold-work mould steel is 1.5%-12.0%. The invention also provides a method for preparing the cold-work mould steel. The cold-work mould steel prepared by using the method has good wear resistance while having high toughness.

Description

technical field [0001] The invention belongs to the technical field of iron-based alloys containing vanadium or niobium, and specifically relates to a novel powder metallurgy high-toughness cold-working die steel and a preparation method thereof. Background technique [0002] Mold is an extremely important and indispensable special basic process equipment in industrial production. The use of molds to mass produce parts has high production efficiency, high consistency, low energy consumption materials, and high precision and complexity. It has been paid more and more attention by various industrial production departments. The main failure forms of cold working dies include wear, fracture and plastic deformation. The main evaluation indicators of cold working die materials include four aspects: wear resistance, impact toughness, bending strength and hardness. [0003] The wear resistance of cold work die steel mainly depends on the hard second phase in the steel, the type of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/26C21D8/00B22F9/08B22F3/24
Inventor 李小明钟海林霍光王学兵卢广峰匡星况春江吴立志
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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