Processing technology of jet-molded high-speed steel

Abstract

The high-speed steel comprises the following chemical components in percentage by weight: 0.67%-0.71% of C, 0.61%-0.65% of Si, 6.48%-6.53% of W, 4.76%-4.82% of Mo, 3.01%-3.11% of Cr, 1.89%-1.93% of V and 4.52%-4.58% of Co, and the high-speed steel is prepared through the processes of molten steel smelting, high-pressure injection molding, annealing treatment, quenching and tempering treatment and the like in sequence. The high-speed steel formed through annealing and isothermal repeated quenching and tempering jet machining after Co is added is large in overall hardness and high in tensile strength, the precipitation number of high-speed steel carbides is increased by adding Co, the precipitation strengthening effect of the carbides is enhanced, then the tempering hardness of the high-speed steel is improved, the hardness decreasing trend is slowed down, and the service life of the high-speed steel is prolonged. And the high-speed steel shows relatively high tempering resistance stability.

Description

technical field

[0001] The invention relates to the technical field of high-speed steel processing, and more specifically, the invention relates to a spray-forming high-speed steel processing technology. Background technique

[0002] High-speed steel is a tool steel with high hardness, high wear resistance and high heat resistance, also known as high-speed tool steel or front steel, commonly known as white steel, high-speed steel has good process performance, good strength and toughness, so it is mainly It is used to manufacture complex thin-edged and impact-resistant metal cutting tools, as well as high-temperature bearings and cold extrusion dies, etc.;

[0003] The prior art has the following deficiencies: the treatment process of high-speed steel and the types of metal additives are few, which leads to a small amount of carbide precipitation during the processing of high-speed steel, reduces the overall hardness and tensile strength of high-speed steel, and has poor temp...

Examples

Embodiment 1

[0039] Sample preparation for the microstructure of the high-speed steel sample: use a wire cutting machine to cut the sample into small pieces, 10mm in height, and grind and polish to obtain a metallographic sample, use 4% nitric acid alcohol for corrosion, and conduct metallographic testing under a Zeiss metallographic microscope For tissue observation, the morphology of matrix and carbide was observed under FEI-Siron field emission scanning electron microscope.

Embodiment 2

[0041] Carbon replica sample preparation: mount the high-speed steel sample with cold mounting materials to make a mosaic sample, grind the sample, polish and corrode, choose picric acid as the corrosion agent, and the specific composition ratio is 1g picric acid + 5m1 hydrochloric acid + 500m1 methanol, Corrosion for 3 minutes, after the sample is corroded, carry out vacuum sputtering coating and carbon spraying. The film time and coating thickness are controlled by computer to ensure the uniformity and thickness of the carbon film. After the sample is coated, use a blade to divide the coating surface into 3mmX3mm. Square grid, using the electrolytic film removal method, the time is 5min, so that the size of the removed film is consistent with the size of the copper mesh, after the film is removed, use the copper mesh to pick up the carbon film, then wash it in alcohol, and finally dry it on filter paper That's it.

Embodiment 3

[0043] Hardness performance test: FR-3e digital Rockwell hardness tester is used, the loading load is 150kg, and the loading position is close to the center of the carbon film sample, within 1 / 2 of the radius.

technical field

[0001] The invention relates to the technical field of high-speed steel processing, and more specifically, the invention relates to a spray-forming high-speed steel processing technology. Background technique

[0002] High-speed steel is a tool steel with high hardness, high wear resistance and high heat resistance, also known as high-speed tool steel or front steel, commonly known as white steel, high-speed steel has good process performance, good strength and toughness, so it is mainly It is used to manufacture complex thin-edged and impact-resistant metal cutting tools, as well as high-temperature bearings and cold extrusion dies, etc.;

[0003] The prior art has the following deficiencies: the treatment process of high-speed steel and the types of metal additives are few, which leads to a small amount of carbide precipitation during the processing of high-speed steel, reduces the overall hardness and tensile strength of high-speed steel, and has poor temp...

Examples

Embodiment 1

[0039] Sample preparation for the microstructure of the high-speed steel sample: use a wire cutting machine to cut the sample into small pieces, 10mm in height, and grind and polish to obtain a metallographic sample, use 4% nitric acid alcohol for corrosion, and conduct metallographic testing under a Zeiss metallographic microscope For tissue observation, the morphology of matrix and carbide was observed under FEI-Siron field emission scanning electron microscope.

Embodiment 2

[0041] Carbon replica sample preparation: mount the high-speed steel sample with cold mounting materials to make a mosaic sample, grind the sample, polish and corrode, choose picric acid as the corrosion agent, and the specific composition ratio is 1g picric acid + 5m1 hydrochloric acid + 500m1 methanol, Corrosion for 3 minutes, after the sample is corroded, carry out vacuum sputtering coating and carbon spraying. The film time and coating thickness are controlled by computer to ensure the uniformity and thickness of the carbon film. After the sample is coated, use a blade to divide the coating surface into 3mmX3mm. Square grid, using the electrolytic film removal method, the time is 5min, so that the size of the removed film is consistent with the size of the copper mesh, after the film is removed, use the copper mesh to pick up the carbon film, then wash it in alcohol, and finally dry it on filter paper That's it.

Embodiment 3

[0043] Hardness performance test: FR-3e digital Rockwell hardness tester is used, the loading load is 150kg, and the loading position is close to the center of the carbon film sample, within 1 / 2 of the radius.

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