39 KB2657 KB34 KB199920252011Grum, JanezŽagar, Sebastjanštevilka:4letnik:57str. 334-344ISSN:0039-2480COBISSID:11989531URN:URN:NBN:SI:doc-O25DY8VDenAssociation of Mechanical Engineers and Technicians of Slovenia et al.Zveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikaluminijeve zlitinealuminium alloyaluminium alloyshrapavost površinematerialimicrohardnessmikrotrdotaresidual stressesshot peeningsurface integritytopografija površineudarno utrjevanjezaostale napetostiSurface integrity after mechanical hardening of various aluminium alloys|The paper presents two types of aluminium alloys, EN AW 2007 and EN AW 6082, treated by shot peening in which the surfaces of the metals were subjected to cold deformation under different treatment conditions. For this purpose, S170 steel particles with a diameter of 0.5 mm and a hardness of 56 HRC were used with different air pressures and mass flows, providing Almen intensity levels between 10A and 28A. The treated surfaces were studied in terms of surface integrity at macro- and microscopic levels, and the surface roughness, microhardness profiles, and residual stresses of each treated surface layer were recorded. Research results reveal significant differences between the properties recorded in the surface integrity examination, which are based on the selected shot peening parameters. This means that these parameters substantially impact the surface conditions and the surface layer. The microscopic analysis confirmed that the sharpest treatment conditions result in surface deformations which may cause cracks and subsequently lead to the mechanical part's collapseNamen prispevka je predstaviti dve vrsti aluminijevih zlitin AlCu4PbMgMn (2007-T351) in AlSi1MgMn (6082-T651), ki sta bili mikro površinsko utrjeni z različnimi pogoji udarnega utrjevanja s kinetično energijo kroglic. Udarno mikroutrjevanje površine je bilo izvedeno s kaljenimi jeklenimi kroglicami premera 0,5 mm, oznake S170 s trdoto 56 HRC, z različnimi tlaki zraka in z masnimi pretoki, ki zagotavljajo različne Almenove intenzitete. Cilj raziskave je, da z eksperimentalnimi metodami raziščemo zvezo med pogoji udarnega utrjevanja aluminijevih zlitin ter hrapavostjo in topografijo površine z mikroskopskimi preiskavami poškodb na površini, podprto z analizo mikrostrukture, trdote in zaostalih napetostiTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo