TY - CHAP A1 - Juijerm, Patiphan A1 - Altenberger, Igor A1 - Noster, Ulf A1 - Scholtes, Berthold T1 - Residual stress relaxation and cyclic deformation behavior of deep rolled AlMg4.5Mn (AA5083) at elevated temperatures T2 - Materials Science Forum N2 - The cyclic deformation behavior of deep rolled and polished aluminium wrought alloy AlMg4,5Mn in the temperature range 20-300°C has been investigated. Results of quasistatic tension and compression tests of untreated specimens in the temperature range 20-300°C are presented. To characterize the fatigue behavior for stress-controlled tests as a function of test temperature, s-n curves, cyclic deformations curves and mean strains as a function of number of cycles are given. The residual stress- and work hardening states near the surface of deep rolled aluminium alloy AlMg4.5Mn before and after fatigue tests were investigated by X-ray diffraction methods. The investigated AlMn4.5Mn aluminium alloy shows cyclic hardening until fracture at all stress amplitudes in stress-controlled fatigue tests at 25-150°C. With increasing temperature the deformation behavior shifts from cyclic hardening to cyclic softening. Below a certain stress amplitude at a given temperature deep rolling led to a reduction of the plastic strain amplitude as compared to the untreated state through cyclically stable near-surface work hardening as indicated by stable FWHM-values. This reduction in plastic strain amplitude is associated with enhanced fatigue lives. The effectiveness of deep rolling is governed by the cyclic and thermal stability of near-surface work hardening rather than macroscopic compressive residual stresses. Since near-surface work hardening is known to retard crack initiation, deep rolling is also effective in temperature- and stress ranges where macroscopic compressive residual stresses have relaxed almost completely, but where near-surface work hardening prevails. Above certain stress amplitudes and temperatures, deep rolling has no beneficial effect on the fatigue behavior of AlMg4.5Mn. This is a consequence of instable near-surface microstructures, especially instable near-surface work hardening. KW - deep rolling KW - residual stress relaxation KW - high temperature fatigue Y1 - 2005 U6 - https://doi.org/10.4028/www.scientific.net/MSF.490-491.436 VL - 490-491 SP - 436 EP - 441 PB - Trans Tech Publications ER - TY - BOOK A1 - Altenberger, Igor A1 - Wagner, Lothar A1 - Mhaede, Mansour A1 - Juijerm, Patiphan A1 - Noster, Ulf T1 - Effect of Deep Rolling on the Cyclic Performance of Magnesium and Aluminium Alloys in the Temperature Range 20-250°C T3 - The 10th International Conference on Shot Peening (ICSP), Conference Proceedings, Tokyo Japan, 15th to 18th September, 2008 N2 - Mechanical surface treatments such as deep rolling or laser-shock peening can markedly affect the cyclic performance of light-weight alloys, especially if significant thick work hardened surface regions are induced. At room temperature, the cyclic deformation behaviour is strongly influenced by the nature of the induced near-surface microstructures provided that they remain stable during fatigue loading. At elevated temperatures, the stability of near-surface work hardening and local microstructures plays an even more important role since the process-induced residual compressive stresses are likely to anneal out partially or completely. This overview illustrates to what extent deep rolling can effect the cyclic performance of various wrought light alloys being fatigue loaded in stress control at ambient and elevated temperatures. KW - Deep Rolling KW - Aluminum Alloys KW - Magnesium Alloys KW - High Temperature Fatigue Y1 - 2008 UR - https://www.researchgate.net/publication/273319235_Effect_of_Deep_Rolling_on_the_Cyclic_Performance_of_Magnesium_and_Aluminium_Alloys_in_the_Temperature_Range_20-250C ER -