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Alloy tool steel in multi-type super-fine carbonates

A technology of alloy tool steel and carbide, which is applied in the field of tool and die steel, can solve the problems of lack of high-carbon medium-alloy steel varieties, decrease in hardness, difficulty in refining carbides, etc., and achieve high hardness, high sharpness, and high wear resistance sexual effect

Inactive Publication Date: 2009-06-03
DALIAN MARITIME UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, when people try to improve the wear resistance and increase the alloy content to make it a high-carbon medium-alloy steel, the refinement of carbides becomes a problem
At this time, since the amount of retained austenite after quenching is much higher than that of high-carbon low-alloy steel, it is bound to require a higher tempering temperature, which will lead to a decrease in hardness.
Therefore, tool and die steels at home and abroad have always lacked high-carbon medium-alloy steel varieties.

Method used

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  • Alloy tool steel in multi-type super-fine carbonates
  • Alloy tool steel in multi-type super-fine carbonates
  • Alloy tool steel in multi-type super-fine carbonates

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Embodiment Construction

[0022] Such as Figure 1 ~ Figure 3 A multi-type ultrafine carbide medium alloy tool steel is shown. The composition and content are shown in Table 1, the heat treatment process is shown in Table 2, and the mechanical properties are shown in Table 3. The manufacturing process route of molds and cutting tools is: forging→annealing→straightening→rough grinding→quenching→straightening→(cold treatment)→tempering→straightening→grinding→finished product.

[0023] Table 1 Composition Weight %

[0024] C Si mn Cr W Mo V Ni S P Fe 0.76-

0.85 0.45-

0.6 0.25-

0.45 1.7-2.

1 1.7-1.

95 0.9-1.

05 0.3-0.

4 0.25-0.

6

≤0.015

≤0.02

margin

[0025] Table 2 Heat treatment process

[0026] work

sequence Process and description hardness Organization and Notes retreat

fire ...

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Abstract

This invention relates to alloying and heat treatment craft of tool die steel, it belongs to one kind of DM8B-2 multi-types superfine carbide high carbon alloy tool steel. Using alloy design method which voluntarily developing, do the phase equilibrium thermo dynamics, electronic / atom level binding energy computation,quenching and the tempered hardness computation as well as to synthesis appraisal its toughness and sintensity. Its ingredient characteristic is appropriate C quantity and Cr / (W+Mo) ratio, reasonable Si, Mn as well as few Ni; Its microstructure characteristic has the superfine carbide, annealing carbide size is between 0.05-0.8mum, when quenching, the undissolved carbide size should not to be smaller than 0.5mum. after quenching to add 200degree C-300degree C, tempering may enable the tempering hardness to achieve 61-64HRC by using carbide precipitation hardening. It has high yield strength and the impact toughness.In the thin edge cutting tool, cutting die and weightily attacking die areas, it has widespread application prospect.

Description

technical field [0001] The invention relates to tool and die steel, in particular to the design and heat treatment process of DM8B-2 type alloy steel. technical background [0002] Carbide refinement has an important influence on the performance improvement of tool and die steel. However, when people try to improve the wear resistance and increase the alloy content to make it a high-carbon medium-alloy steel, the refinement of carbides becomes a difficult problem. At this time, since the amount of quenched retained austenite is much higher than that of high-carbon low-alloy steel, it is bound to require a higher tempering temperature, which will lead to a decrease in hardness. Therefore, tool and die steels at home and abroad have always lacked high-carbon medium-alloy steel varieties. With the development of the processing industry, when thin-edged tools, shearing dies and heavy impact dies are required to have a longer service life and better processing quality than high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/46C21D1/26C21D1/18C21D11/00
Inventor 马永庆张洋
Owner DALIAN MARITIME UNIVERSITY
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