Composite technique of steel member surface shot-blasting and plasma low-temperature boriding

A technology of plasma infiltration and compound process, which is applied in the field of steel surface modification heat treatment process, can solve the problems of large deformation of mold steel and mold, achieve the effects of improving wear resistance, reducing boronizing temperature, and simplifying the process

Inactive Publication Date: 2009-02-11
SHANGHAI UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to improve the defect in the prior art that the mold steel mold deformation is large due to the high boronizing vortex, and use the characteristics of the fine gr...

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  • Composite technique of steel member surface shot-blasting and plasma low-temperature boriding

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Embodiment 1

[0013] Embodiment one: the steel piece sample that adopts is the hot working die steel H13 steel, at first this mold steel steel piece sample is carried out shot peening treatment on the stage of shot blasting machine; Spray material is cast steel projectile, and its grain The diameter is 0.25mm, the hardness of the cast steel projectile is 48HRC; the spray angle is 60°; the spray pressure is 4.6kg; the shot peening time is 45 minutes. Then, put the above-mentioned shot-peened mold steel sample in the heat treatment furnace, and pass BF into the furnace. 3 , Ar and H 2 mixed gas; BF 3 The flow rate of Ar is 40ml / min; the flow rate of Ar is 25ml / min; 2 The flow rate of the furnace is 25ml / min; the air pressure in the furnace is controlled within the range of 450-500Pa after feeding the combined gas; the heat treatment temperature of plasma boronizing is 560°C (the general tempering temperature of hot work die steel is 580-620°C, which is lower than General tempering te...

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Abstract

The invention relates to a technique which includes carrying out ball blast on the surface of a mould steel part and then plasma boriding to form a composite layer, belonging to the technical field of steel surface modification heat treatment. The technique is characterized in that: first, carrying out ball blast on the surface of a mould steel part; second, inletting gaseous mixture of BF3, Ar and H2 into heat treatment furnace for carrying out plasma boriding at a low temperature; the temperature for plasma boriding is from 510 DEG C to 610 DEG C , lower than the tempering temperature which is within 580-620 DEG C for general hot-work mould steel, and much lower than the temperature for traditional plasma boriding which ranges from 850 DEG C to 950 DEG C; finally, a composite layer of ball blast layer and boriding layer is formed on the surface of the steel part. The composite layer has the advantages of high hardness and strong rotproofness. As boriding is carried out at low temperature, gross distortion of the steel part under high-temperature treatment is avoided. The invention can prolong the service life of the mould steel.

Description

technical field [0001] The invention relates to a process method for forming a composite layer by shot peening on the surface of a mold steel steel part and then performing plasma boronizing, which belongs to the technical field of steel surface modification heat treatment process Background technique [0002] Boronizing treatment can form a boride layer with special physical properties on the surface of the material, thereby endowing the surface of the material with high hardness, high wear resistance, corrosion resistance, high temperature oxidation resistance and other excellent properties, and significantly improving the service life of the mold. Hot work die steel is mainly used to manufacture metal or liquid metal pressing molds heated above the recrystallization temperature, such as hammer forging dies, machine forging dies, hot extrusion dies and die-casting dies. H13, the most widely and most representative of hot work die steels, can serve at 600°C and is widely us...

Claims

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Application Information

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IPC IPC(8): C23F17/00C21D7/06C23C8/38
Inventor 吴晓春王庆芳
Owner SHANGHAI UNIV
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