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
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[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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