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A two-stage homogenization process for h13 die steel

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

Active Publication Date: 2022-03-22
NORTHEASTERN UNIV LIAONING
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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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  • A two-stage homogenization process for h13 die steel
  • A two-stage homogenization process for h13 die steel
  • A two-stage homogenization 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

A two-stage homogenization treatment process for H13 mold steel, which belongs to the field of material technology and specifically includes: after the casting of H13 mold steel is completed, it is first subjected to a one-stage homogenization process through a 720‑820°C / 1‑3h homogenization process, and then The 1150-1230℃ / 1-3h homogenization process performs secondary homogenization treatment, and the total holding time is 2-6h. A two-stage homogenization treatment is used to reduce or eliminate alloy element segregation and eutectic carbides in as-cast H13 steel, improve the uniformity of the alloy structure, and obtain a fine grain structure. This process has the advantages of simple operation, wide applicability, and reduced actual process costs.

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 Patents(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 LIAONING
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