Abstract
In this work, an investigation was made to analyze the surface residual stresses on additive manufactured stainless steel AISI 316L in as-built and post-treated conditions. Direct metal laser sintering was used to fabricate the metal blocks. X-ray residual stress analysis on the as-fabricated surface revealed the presence of an inhomogeneous and irregular distribution of residual stresses in the as-built condition ranging from - 30 MPa to 111 MPa. It was mainly due to the localized laser heat source that caused variations in stresses at a lattice level. Heat treatment was performed for providing relief to the residual stress from the as-built condition showed significant relief of residual stress, which was lesser than 50% compared to as-built condition. Beneficial compressive residual stress induced by shot peening and lapping resulted in high magnitude compressive stresses on the surface. Also, homogeneous distribution of residual stress was found on the peened and lapped surface layer with an average of - 531 MPa and - 554 MPa, respectively.
Highlights
Additive Manufacturing (AM) is one of the modern-day manufacturing methods used in the manufacture of complex-shaped parts, for those seen in aero engine applications, aircraft structural components, and bio-implants, etc. [1,2,3,4,5]
The focus of this study is on the influence of stress relief to heat treatment, shot peening, and lapping on the modification of surface residual stress pattern in AISI 316L fabricated through the use of a laser-based AM process
The present study reveals the analysis of residual stresses on metal blocks of AISI 316L fabricated using the laser-aided additive manufacturing process
Summary
An investigation was made to analyze the surface residual stresses on additive manufactured stainless steel AISI 316L in as-built and post-treated conditions. Direct metal laser sintering was used to fabricate the metal blocks. X-ray residual stress analysis on the as-fabricated surface revealed the presence of an inhomogeneous and irregular distribution of residual stresses in the as-built condition ranging from – 30 MPa to 111 MPa. It was mainly due to the localized laser heat source that caused variations in stresses at a lattice level. Beneficial compressive residual stress induced by shot peening and lapping resulted in high magnitude compressive stresses on the surface. Homogeneous distribution of residual stress was found on the peened and lapped surface layer with an average of – 531 MPa and – 554 MPa, respectively
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