INFLUENCE OF THE CYCLICAL MECHANIC-THERMAL PROCESSING ON THE STRAIN HARDENING IN THE SURFACE LAYERS OF STEEL PARTS

Bissesar, Sanjeevkoemar¹; Alfonso Brindis, Eleno¹; Abdoel Wahid, Faizel¹; Tchiquendja Eleno, Francisco²

¹ Anton de Kom University of Suriname; ² Universidad de Matanzas "Camilo Cienfuegos

doi:10.20906/CPS/COB-2015-0196

Resumo

Nowadays, one of the most important problems in the face of academia and engineering is to upgrade the parts' reliability and their life period. Among the used techniques for achieving this aim, highlights the fact of guaranteeing the required quality indicators in their surface layers (a given surface roughness magnitude; the appropriated level, degree and penetration depth of strain hardening; and the appropriated level, sign and penetration depth of the residual stresses). Substantially on these factors dependent the fatigue strength, the wear resistance and the corrosion stability of machine parts. That is why the objective of this study was to investigate the influence of the two and three cyclic mechanic-thermal processing on the strain hardening in the surface layers of the AISI 1045 steel parts. In this sense, various experiments are carried out, using the full factorial experiment for five factors (number of cycles, degree of plastic deformation, force, temperature and time) at 2-level. As results were obtained both exponential models of the degree and penetration depth dependences of the strain hardening on the main cold plastic deformation and ageing parameters. In all the experiments the surface roughness were improved till 0.32. 0.16 micrometers.

Palavras-chave: cyclical; mechanic-thermal; processing; strain; hardening