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Heat treatment process for ultra-fine grain structure of annealed hot work die steel

A technology of hot work die steel and hot work die, which is applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., and can solve the problems affecting the toughness of steel

Active Publication Date: 2022-04-29
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a heat treatment process for ultra-fine crystallized structure of annealed hot work die steel, which overcomes segregation bands, liquid carbides, non-metallic inclusions, coarse grain boundaries, etc. in the existing banded segregation structure Some structural defects affect the toughness of steel

Method used

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  • Heat treatment process for ultra-fine grain structure of annealed hot work die steel

Examples

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Embodiment 1

[0019] This example provides a heat treatment process for ultra-fine grained structure of annealed hot work die steel. The heat treatment material is annealed H13 (4Cr5MoSiV1) hot work die steel (meeting the requirements of GB / T 1299-2014 standard), processed according to requirements Form the mold blank, depending on the size of the mold, leave a machining allowance of 1.5mm to 2mm, and install multiple thermocouples for temperature detection on different areas such as the center and surface of the mold; including the following steps:

[0020] (1) The first high-temperature homogenization: This process includes two-stage preheating, heating the mold to be heat-treated to 500°C at a heating rate of 80°C / h for 1 hour, and raising the temperature to 800°C at a heating rate of 80°C / h ℃ heat preservation for 1h; heat up to 1050°C at a heating rate of 80°C / h, and when the core temperature is 5°C lower than the set austenitization temperature, heat preservation for 1h; round steel or...

Embodiment 2

[0027] This example provides a heat treatment process for ultra-fine grained structure of annealed hot work die steel. The heat treatment material is annealed H13 (4Cr5MoSiV1) hot work die steel (meeting the requirements of GB / T 1299-2014 standard), processed according to requirements Form the mold blank, depending on the size of the mold, leave a machining allowance of 1.5mm to 2mm, and install multiple thermocouples for temperature detection on different areas such as the center and surface of the mold; including the following steps:

[0028] (1) The first high-temperature homogenization: This process includes two-stage preheating, heating the mold to be heat-treated to 550°C at a heating rate of 70°C / h for 1 hour, and raising the temperature to 830°C at a heating rate of 70°C / h ℃ heat preservation for 1h; heat up to 1080°C at a heating rate of 70°C / h, and when the core temperature is 8°C lower than the set austenitization temperature, heat preservation for 1h; round steel or...

Embodiment 3

[0035] This example provides a heat treatment process for ultra-fine grained structure of annealed hot work die steel. The heat treatment material is annealed H13 (4Cr5MoSiV1) hot work die steel (meeting the requirements of GB / T 1299-2014 standard), processed according to requirements Form the mold blank, depending on the size of the mold, leave a machining allowance of 1.5mm to 2mm, and install multiple thermocouples for temperature detection on different areas such as the center and surface of the mold; including the following steps:

[0036] (1) The first high-temperature homogenization: This process includes two-stage preheating, heating the mold to be heat-treated to 600°C at a heating rate of 50°C / h for 1 hour, and raising the temperature to 850°C at a heating rate of 50°C / h ℃ heat preservation for 1 hour; heat up to 1100 ℃ at a heating rate of 50 ℃ / h, and when the core temperature is 10 ℃ lower than the set austenitization temperature, heat preservation for 1 hour; round...

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Abstract

The invention discloses a heat treatment process for an ultra-fine grain structure of annealed hot work die steel, and belongs to the technical field of heat treatment of hot work die steel. The heat treatment material is an annealed hot-working die blank, and a plurality of thermocouples for detecting temperature are mounted on the core part and the surface of the die; comprising the steps of first-time high-temperature homogenization, first-time air / water alternate quenching, first-time high-temperature tempering, second-time high-temperature quenching after tempering, stress relief annealing, mold quenching and tempering and the like. The method has the beneficial effects that the heat treatment process is completely utilized for regulation and control, liquation carbides, martensite structures and austenite grains can be refined at the same time, and the impact toughness is improved while the material strength is kept. And the grain size can be improved from 6-7 grades to 8-10 grades, the transverse impact toughness can be improved by 15% or above, and the room-temperature plasticity is also improved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of hot work die steel, and in particular relates to a heat treatment process for ultra-fine crystallized structure of annealed hot work die steel. Background technique [0002] Die-casting is a production technology with high degree of mechanization and production efficiency. It is an advanced less-cutting process and is considered to be the most effective production process for mass production of castings with high-quality surfaces. Copper, aluminum and other metal die-casting molds usually use H13 (4Cr5MoSiV1), 4Cr5Mo1V and 4Cr5Mo2V hot work die steel, and thermal fatigue cracks (hereinafter referred to as thermal cracks) are one of the most important failure forms that affect the life of copper, aluminum and other metal die-casting dies. First, the change of mechanical stress induced by heat is an important reason for hot cracking on the surface of the mold, and plastic strain plays a ke...

Claims

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Application Information

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IPC IPC(8): C21D1/00C21D1/18C21D1/30C21D1/773C21D6/00C21D11/00
CPCC21D1/00C21D1/18C21D1/30C21D1/773C21D6/002C21D6/008C21D11/00
Inventor 周健马党参迟宏宵樊译
Owner CENT IRON & STEEL RES INST
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