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H13 steel hard surface surfacing layer heat treatment method

A heat treatment method and surfacing layer technology, applied in heat treatment furnaces, heat treatment equipment, welding equipment, etc., can solve problems such as the influence of mechanical properties of surfacing layers, uneven tissue composition, and dislocations

Pending Publication Date: 2021-09-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, some welding defects in the welding area, such as dislocations, welding residual stress, uneven tissue composition, etc., will have an adverse effect on the mechanical properties of the surfacing layer

Method used

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  • H13 steel hard surface surfacing layer heat treatment method
  • H13 steel hard surface surfacing layer heat treatment method
  • H13 steel hard surface surfacing layer heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Cut the H13 steel with a wire cutting machine as the welding matrix. Before surfacing, the sample is mechanically ground with 400 mesh, 600 mesh, 800 mesh and 1000 mesh sandpaper, rinsed with tap water, placed in absolute ethanol for ultrasonic vibration to remove the particles attached to the surface, and after drying, ultrasonically cleaned in sodium hydroxide to remove The grease on the surface of the sample was finally rinsed with distilled water, ultrasonically oscillated with anhydrous ethanol, dried, and set aside.

[0022] (2) Overlay welding: the preheating temperature is 250-300°C, the interlayer temperature is 200-250°C, the wire diameter is 1.2mm, the welding current is 100-140A, the arc voltage is 17-25V, and the welding speed is 5mm / s , The polarity of the power supply is DC reversed. Chemical composition of hardfacing layer: C 0.03-0.07%, Si 0.40-0.60%, Mn 1.00-1.35%, Cr 9.50-13.50%, Mo 0.30-0.65%, V 0.06-0.15%, Ni 1.15-1.80%. The hardness and wear ...

Embodiment 2

[0027] (1) With embodiment 1.

[0028] (2) With embodiment 1.

[0029] (3) with embodiment 1.

[0030] (4) Heat treatment: Temper the processed mold and cool it to room temperature in air to obtain the finished product. The tempering temperature is 450°C, the holding time is 1h, and the heating rate is 10°C / min.

[0031] (5) Observation by transmission electron microscope of the hard surface welding layer obtained by the above steps shows that the structure of the welding layer is refined, welding defects are reduced, and no "secondary hardening" occurs. The hardness of the surfacing layer is 330.8±6.4HV 0.2 . After the friction and wear test, the mass loss of the surfacing layer was 14.9±0.2mg.

Embodiment 3

[0033] (1) With embodiment 1.

[0034] (2) With embodiment 1.

[0035] (3) with embodiment 1.

[0036] (4) Heat treatment: Temper the processed mold and cool it to room temperature in air to obtain the finished product. The tempering temperature is 450°C, the holding time is 2h, and the heating rate is 10°C / min.

[0037] (5) Observation by transmission electron microscope of the hard surface welding layer obtained by the above steps shows that the structure of the welding layer is refined, welding defects are reduced, and the effect of "secondary hardening" is obvious. The hardness of the surfacing layer is 370.0±6.3HV 0.2 . After the friction and wear test, the mass loss of the surfacing layer was 11.8±1.3mg.

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Abstract

The invention discloses an H13 steel hard surface surfacing layer heat treatment method. H13 steel is used as a welding base body for surfacing, a prepared hard surface surfacing layer is subjected to finish machining so as to reach the size required by a mold, the machined mold is subjected to tempering treatment and air cooling to the room temperature, and a finished product is obtained. The tempering temperature ranges from 250 DEG C to 650 DEG C, and the tempering heat preservation time ranges from 0.5 h to 6 h. According to the method, the welding defects such as dislocation, welding residual stress and uneven structural components in the hard surface surfacing layer on the H13 steel surface are eliminated through post-welding tempering heat treatment. The structure and mechanical properties of the surfacing layer are improved by reasonably controlling the tempering temperature, the heat preservation time and the heating rate.

Description

technical field [0001] The invention relates to the field of mold processing and heat treatment, in particular to a heat treatment method for a hard surface surfacing layer of H13 hot work mold steel. Background technique [0002] H13 hot work die steel has the advantages of low cost, high strength, good ductility, good wear resistance, good impact toughness, etc., and is widely used as a mold manufacturing material. This type of mold bears relatively complex loads during service, requiring its surface to have high hardness and wear resistance. However, after a period of service, the surface of the mold is severely worn and cracked, which directly threatens the production and personal safety of employees. Therefore, a new mold must be replaced immediately, which will cause an increase in production costs and a waste of resources. The service life of the mold can be significantly extended and its performance can be increased by re-repair or surface strengthening technology....

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/18B23K9/18B23K9/04
CPCC21D9/0068C21D1/18B23K9/04B23K9/18
Inventor 高志明王心悦胡文彬王吉会田秋成史庆志
Owner TIANJIN UNIV
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