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Two-stage homogenization treatment process for H13 die steel

A homogenization treatment and two-stage homogenization technology, applied in the field of materials, can solve the problems of coarse grains and high process costs

Active Publication Date: 2021-08-24
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional homogenization is also called first-level homogenization, because the homogenization process requires high temperature and long-term treatment, resulting in high process costs and coarse grains

Method used

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  • Two-stage homogenization treatment process for H13 die steel
  • Two-stage homogenization treatment process for H13 die steel
  • Two-stage homogenization treatment process for H13 die steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A two-stage homogenization treatment process for H13 die steel, the specific operation steps include:

[0022] (1) H13 hot work die steel is prepared by a certain smelting method, the composition is (mass percentage): C 0.41%, Si 1.11%, Mn 0.45%, Cr 5.45%, Mo 1.74%, V 1.15%, unavoidable impurities Content <0.1%, the balance is Fe;

[0023] (2) Put the mold steel into the soaking furnace, firstly perform the first-level homogenization treatment of the cast ingot at 800°C / 3h, and water-cool to room temperature after the heat preservation is completed;

[0024] (3) Place the mold steel after primary homogenization treatment in a soaking furnace, perform secondary homogenization treatment at 1200°C / 1h, and water cool to room temperature after heat preservation.

[0025] The microstructure of the H13 die steel sample after two-stage homogenization treatment is as follows: figure 1 shown. figure 1 (a) shows the dendrite segregation morphology. It can be seen that the dendr...

Embodiment 2

[0027] A two-stage homogenization treatment process for H13 die steel, the specific operation steps include:

[0028] (1) H13 hot work die steel is prepared by a certain smelting method, the composition is (mass percentage): C 0.37%, Si 1.01%, Mn 0.35%, Cr 5.15%, Mo 1.47%, V 1.01%, unavoidable impurities Content <0.1%, the balance is Fe;

[0029] (2) Put the die steel into the soaking furnace, and firstly perform the first-level homogenization treatment of the cast ingot at 800°C / 2h, and then water-cool to room temperature after the heat preservation is completed;

[0030] (3) Place the mold steel after primary homogenization treatment in a soaking furnace, perform secondary homogenization treatment at 1200°C / 2h, and water cool to room temperature after heat preservation.

[0031] The microstructure of the H13 die steel sample after two-stage homogenization treatment is as follows: figure 2 shown. figure 2 (a) shows the dendrite segregation morphology. It can be seen that...

Embodiment 3

[0033] A two-stage homogenization treatment process for H13 die steel, the specific operation steps include:

[0034] (1) H13 hot work die steel is prepared by a certain smelting method, the composition is (mass percentage): C 0.33%, Si0.89%, Mn 0.26%, Cr 4.82%, Mo 1.28%, V 0.83%, unavoidable impurities Content <0.1%, the balance is Fe;

[0035] (2) Put the die steel into the soaking furnace, firstly perform the first-level homogenization treatment of the cast ingot at 800°C / 1h, and water-cool to room temperature after the heat preservation is completed;

[0036] (3) Place the mold steel after primary homogenization treatment in a soaking furnace, perform secondary homogenization treatment at 1200°C / 3h, and water cool to room temperature after heat preservation.

[0037] The microstructure of the H13 die steel sample after two-stage homogenization treatment is as follows: image 3 shown. image 3 (a) shows the dendrite segregation morphology. It can be seen that the dendrit...

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Abstract

The invention provides a two-stage homogenization treatment process for H13 die steel, and belongs to the technical field of materials. The two-stage homogenization treatment process specifically comprises the following steps that after casting of the H13 die steel is completed, first-stage homogenization treatment is carried out through a homogenization process at 720-820 DEG C for 1-3 h, then second-stage homogenization treatment is carried out through a homogenization process at 1150-1230 DEG C for 1-3 h, and the total heat preservation time is 2-6 h. A two-stage homogenization treatment mode is adopted, so that alloy element segregation and eutectic carbides of as-cast H13 steel are reduced or eliminated, the uniformity of an alloy structure is improved, and a fine grain structure is obtained. The two-stage homogenization treatment process has the advantages of being simple and convenient to operate, wide in applicability, and capable of reducing the actual process cost.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a two-stage homogenization treatment process for H13 die steel. Background technique [0002] Dendrite segregation is common in as-cast H13 die steel, which contains a large amount of alloying elements such as chromium, molybdenum, and vanadium. Dendrite segregation causes certain damage to the mechanical properties of H13 steel and affects its performance. In traditional industrial production, the common method is to use high-temperature homogenization treatment to accelerate the diffusion process of alloying elements, and place the H13 ingot in Ac 3 The above temperature is kept for a long time to fully diffuse the segregated elements between dendrites. Conventional homogenization is also called first-level homogenization. Since the homogenization process requires high temperature and long-term treatment, the process cost is high and the crystal grains are coars...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C22C38/02C22C38/04C22C38/22C22C38/24
CPCC21D6/002C21D6/005C21D6/008C22C38/02C22C38/04C22C38/22C22C38/24C21D2211/001C21D2211/004
Inventor 李长生李恩韩亚辉任津毅
Owner NORTHEASTERN UNIV
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