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Strengthening and toughening heat treatment process for cold work die steel matrix

A cold work die steel, strengthening and toughening technology, applied in the field of strengthening and toughening heat treatment process, can solve the problems of low impact toughness of steel matrix and insufficient strength and toughness of the matrix, and achieve the effect of improving crack resistance and anti-adhesion performance.

Pending Publication Date: 2022-08-02
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the key factors affecting the deterioration of the carbide impact toughness, the larger the particle size of the carbide, the more obvious the sharp corner shape, the lower the impact toughness of the steel matrix
Therefore, the wear resistance and toughness of cold work die steel are a pair of contradictory performance indicators, and the conventional high wear resistance cold work die steel cannot overcome the problem of insufficient strength and toughness of the matrix

Method used

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  • Strengthening and toughening heat treatment process for cold work die steel matrix
  • Strengthening and toughening heat treatment process for cold work die steel matrix
  • Strengthening and toughening heat treatment process for cold work die steel matrix

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Embodiment 1

[0031] A heat treatment process for strengthening and toughening a cold work die steel matrix in this embodiment, the heat treatment material is Cr12Mo1V1 cold work die steel with a specification of Φ90mm (meeting the requirements of the GB / T 1299-2014 standard), and Φ90mm×200mm are respectively used for conventional heat treatment (for ratio) and experiments were carried out using the protocol of the invention (Example 1). After heat treatment, the impact, bending and metallographic samples were cut at the radius of 1 / 2 of the steel for microstructure analysis of performance testing. The conventional heat treatment (comparative example) process is: 1030 ℃ quenching + 500 ℃ tempering, its metallographic structure see figure 1 shown.

[0032] A cold work die steel matrix strengthening and toughening heat treatment process provided in this embodiment includes the following steps:

[0033] (1) The first pass of high temperature austenitization: heat the raw material or mold bla...

Embodiment 2

[0040] The invention provides a heat treatment process for strengthening and toughening a cold work die steel matrix. The heat treatment material is Φ90mm specification D2 cold work die steel (meeting the requirements of the GB / T 1299-2014 standard), and 40mm×280mm die blanks are respectively subjected to conventional heat treatment. Compared with the strengthening and toughening heat treatment of the matrix, the two processes are compared. After treatment, the impact, bending and metallographic samples were cut at the longitudinal 1 / 4 of the billet for microstructure analysis of performance testing. The conventional heat treatment process is: quenching at 1030°C + tempering at 540°C.

[0041] A cold work die steel matrix strengthening and toughening heat treatment process provided in this embodiment includes the following steps:

[0042] (1) The first pass of high temperature austenitization: heat the raw material or mold blank to 1160°C at a heating rate of 30°C / h, keep it ...

Embodiment 3

[0049] The invention provides a heat treatment process for strengthening and toughening a cold work die steel matrix. The heat treatment material is Φ90mm specification D2 cold work die steel (meeting the requirements of the GB / T 1299-2014 standard), and 40mm×280mm die blanks are respectively subjected to conventional heat treatment. Compared with the strengthening and toughening heat treatment of the matrix, the two processes are compared. After treatment, the impact, bending and metallographic samples were cut at the longitudinal 1 / 4 of the billet for microstructure analysis of performance testing. The conventional heat treatment process is: quenching at 1030°C + tempering at 540°C.

[0050] A cold work die steel matrix strengthening and toughening heat treatment process provided in this embodiment includes the following steps:

[0051] (1) The first pass of high temperature austenitization: heat the raw material or mold blank to 1180°C at a heating rate of 50°C / h, keep the...

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Abstract

The invention discloses a strengthening and toughening heat treatment process for a cold-work die steel matrix, and belongs to the technical field of heat treatment of cold-work die steel. The method comprises the following steps: first-pass high-temperature austenitizing: heating a raw material or a die blank to 1140-1180 DEG C at a heating rate of 30-50 DEG C / h, preserving heat for 1-2 hours after the temperature is reached, and then performing oil cooling or rapid high-pressure air cooling to below 150 DEG C; high-temperature recovery treatment: immediately performing high-temperature heating recovery treatment on the raw material or the mold blank, charging at room temperature, heating to 840-860 DEG C along with the furnace at a heating rate of 30-50 DEG C / h, preserving heat for 1.9-2.1 hours, discharging from the furnace, and air-cooling to room temperature; carrying out second-pass austenitizing; carrying out third-pass austenitizing; and the high-temperature tempering treatment is continuously repeated twice. The heat treatment technology has the advantages that the heat treatment technology of three-time austenitizing, one-time high-temperature recovery treatment and two-time tempering treatment is adopted, so that the cracking resistance, fracture resistance and fracture resistance of the cold-work die steel of the die are improved, and meanwhile, the adhesion resistance of the cold-work die steel is improved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of cold work die steel, and particularly relates to a heat treatment process for strengthening and toughening a cold work die steel matrix. Background technique [0002] Cold work die steel is mainly used to manufacture various dies for pressing metal materials at room temperature, including punching dies, drawing dies, bending and flanging dies, imprinting dies, cold extrusion dies, cold heading dies, Rolling dies and powder pressing dies, etc. Since the metal is formed in a cold state at room temperature, the stress and friction force of the cold work die during the working process are very large, and the performance requirements of the cold work die steel are very strict. When the part is formed, the metal and the mold cavity surface move relative to each other, that is, the mold is subjected to considerable compressive stress and friction. In order to ensure the dimensional accuracy an...

Claims

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Application Information

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IPC IPC(8): C21D1/25
CPCC21D1/25Y02P10/20
Inventor 迟宏宵周健马党参刘继浩
Owner CENT IRON & STEEL RES INST
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