FATIGUE AND TENSILE FRACTURE SURFACE MORPHOLOGIES OF ADDITIVE MANUFACTURED AUSTENITIC STAINLESS STEEL

• Main Authors: Penn RAWN, Vadiraja SUDHAKAR
• Format: Article
• Language: English
• Published: Politehnium Publishing House 2019-03-01
• Series: European Journal of Materials Science and Engineering
• Subjects: fracture morphologies; 316l stainless steel; laser powder bed fusion processing (lpbf); fatigue and tensile fractures.
• Online Access: http://ejmse.tuiasi.ro/articles/EJMSE_04_01_04_Rawn.pdf

Fatigue and tensile fracture surface morphologies of laser additive manufactured (LAM) stainless steel (using powder bed fusion method) were investigated. Both fatigue and tensile fracture surface morphologies were determined using LEO-VP SEM instrument. The fracture surface features were studied as a function of global energy density, one of the main LPBF processing parameters used in producing 316L SS test specimens. The fracture surface morphologies were also compared with the wrought 316L SS fractured specimens. It has been demonstrated that relatively higher energy density (irrespective of the specimen build angle orientations) specimens resulted in predominantly ductile fracture, while lower energy produced relatively brittle fracture surface characteristics, in tensile fractured specimens. Among fatigue fractured specimens, LPBF processed specimens at 90º build angle demonstrated relatively higher ductile fracture characteristics.