Material with high wear resistance

Abstract

Preparing a material with isotropic, mechanical properties and improved wear resistance and high hardness potential, comprises preparing hot isostatic pressing (HIP) blank or HIP block from a ledeburitic tool steel alloy in a press molding process by spraying a liquid metal alloy with nitrogen to a powder and hot isostatic pressing, heating the HIP block and / or a semi-manufactured product from a coarse-grain, subjecting the HIP block to 10[deg] C below a melting temperature of the lowest melting structural phase, and further processing the blank to thermally treated tools. Preparing a material with isotropic, mechanical properties and improved wear resistance and high hardness potential, comprises preparing hot isostatic pressing (HIP) blank or HIP block from a ledeburitic tool steel alloy in a press molding process by spraying a liquid metal alloy with nitrogen to a powder and hot isostatic pressing, heating the HIP block and / or a semi-manufactured product from a coarse-grain at a temperature of 1100[deg] C, subjecting the HIP block to 10[deg] C below a melting temperature of the lowest melting structural phase with a time period of about 12 hours for increasing average carbide phase size of the material to at least 65%, and further processing the blank to thermally treated tools with high resistance to wear and abrasion. The material has surface in a round shape, and a matrix of the material is homogenized. An independent claim is included for material with isotropic, mechanical properties and improved wear resistance having thermally treated condition at a carbide phase ratio of in M 6C and Mc of 7 vol.%, where the matrix has an average carbide-phase size of 2.8 mm and a carbon concentration of 0.45-0.75 wt.%.

Description

technical field [0001] The invention relates to the production of ledeburitic tool steels by means of powder metallurgy methods, the PM material having homogeneous mechanical properties, improved wear resistance and high hardness potential. Background technique [0002] High-alloy tool steels that solidify ledeburite due to their composition, often locally have coarse carbides and carbide accumulations in the structure in the as-cast state, which are formed into strips during hot forming of the ingot Orientation, and finally form carbide rows or deformation structures depending on the deformation direction. This microstructure results in an inhomogeneous characteristic of the material with respect to the stress direction of the respective parts. [0003] In order to obtain homogeneous and improved material properties of high-alloy tool steels, it is known to use a powder metallurgy production method which ensures a uniform distribution of small carbides in the matrix. [0...

AI Technical Summary

Problems solved by technology

[0005] A material produced in this form is as homogeneous as possible in its mechanical properties and is well processable, but has only a limited hardness potential due to the matrix structure

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