Tucho, W.M.; Sletsjøe, A.T.; Sayyar, N.; Hansen, V. Optimizing Tensile Properties and Hardness of Inconel 718 by Cold Rolling. Metals2024, 14, 455.
Tucho, W.M.; Sletsjøe, A.T.; Sayyar, N.; Hansen, V. Optimizing Tensile Properties and Hardness of Inconel 718 by Cold Rolling. Metals 2024, 14, 455.
Tucho, W.M.; Sletsjøe, A.T.; Sayyar, N.; Hansen, V. Optimizing Tensile Properties and Hardness of Inconel 718 by Cold Rolling. Metals2024, 14, 455.
Tucho, W.M.; Sletsjøe, A.T.; Sayyar, N.; Hansen, V. Optimizing Tensile Properties and Hardness of Inconel 718 by Cold Rolling. Metals 2024, 14, 455.
Abstract
The as-received commercial Inconel 718 material was solid solution heat treated (ST), cold rolled (CR), and precipitation hardened (PH) to investigate the effects of deformation on tensile properties, hardness, and texture. Three sets of specimens (0%, 20% and 50% CR) were STed at 1100 C/1h, CR and aged (720 °C/8 h + 650 °C/8 h) for the analysis. Ultimate tensile strength (UTS), 0.2% yield strength (YS) and elongation of 50% deformed condition were 1645 MPa, 1512 MPa, and 3.8 %, respectively. The 20 % deformation resulted in a balanced UTS (1348 MPa), YS (1202 MPa) and elongation (11%). Contributions of precipitation hardening to the strength was decreasing, while contribution of CR increases with increasing percentage of deformation. Correspondingly, the size and quantities of decreased with increasing deformation level. In CR specimens, a high density of nano/micro twins were generated with the twin planes oriented perpendicular to the RD-ND surface. The preferred rotation of the crystals generated the gradient of orientation and internal features of the large austenitic grains. The cross-slip of screw dislocations induced a complete β-fibre, consisting of {110}, {112}, and{123}, with doubled intensity at higher deformation. In addition, the specimens tended to be highly susceptible to the twinning-induced orientation emerged by a predominant ⫽ND. An incomplete but intense α-fibre clustered between {110} and {110} was characterized in the as-deformed condition. Besides achieving highest strength, the current work demonstrates the effects of CR on the material strength without the complex influences of precipitate.
Engineering, Metallurgy and Metallurgical Engineering
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