| 摘要 |
FIELD: chemical industry, shipbuilding. ^ SUBSTANCE: proposed invention is designed to increase corrosion resistance and wear resistance of machine parts and units, particularly, ship equipment accessories. Proposed method includes preliminary heating of part, forming of underlayer, obtaining of surface layer by delivering powder to surface to be treated and in radiating the surface by laser beam for 0.005 - 2.0 s. Preliminary heating pf part is carried out to 300-400°C. Underlayer is formed by delivering metal powder onto surface to be treated of material, hardness not than HRC30 and irradiating the powder layer by laser beam. To form surface layer, mixture of powders of material, hardness higher than HRC60 and metal powder, hardness less than HRC30, ratio (3-4):1, respectively, is used. Subsequent irradiation is carried out by laser beam, radiant density 104-106W/cm2 so that depth of penetration in underlayer is 0.3-0.7 of its thickness, ratio of thickness of surface layer to thickness of underlayer is maintained within (1-3):1. Tempering is carried out at temperature of 300±20°C with holding for 1±0.2 h and subsequent cooling in the air. ^ EFFECT: provision of flawless wear-resistant surface on cast iron and high-carbon steel by means of laser beam. ^ 3 cl, 1 tbl |
