Enhancement of surface characteristics of direct metal laser sintered stainless steel 316L by shot peening

Sugavaneswaran, M.; Jebaraj, A. Vinoth; Kumar, Mithilesh; Lokesh, K.; Rajan, A. John

doi:10.1016/j.surfin.2018.04.010

Cited by 45 publications

(17 citation statements)

References 21 publications

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“…Mechanical treatments such as a shot peening (SP) as a post-treatment are used to improve the as-built surface quality [29]. The shot peening also offers beneficial compressive residual stresses to the component surface and subsurface.…”

Section: Introductionmentioning

confidence: 99%

Additive Manufactured 316L Stainless-Steel Samples: Microstructure, Residual Stress and Corrosion Characteristics after Post-Processing

Santa-aho

Kiviluoma

Jokiaho

et al. 2021

Metals

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Additive manufacturing (AM) is a relatively new manufacturing method that can produce complex geometries and optimized shapes with less process steps. In addition to distinct microstructural features, residual stresses and their formation are also inherent to AM components. AM components require several post-processing steps before they are ready for use. To change the traditional manufacturing method to AM, comprehensive characterization is needed to verify the suitability of AM components. On very demanding corrosion atmospheres, the question is does AM lower or eliminate the risk of stress corrosion cracking (SCC) compared to welded 316L components? This work concentrates on post-processing and its influence on the microstructure and surface and subsurface residual stresses. The shot peening (SP) post-processing levelled out the residual stress differences, producing compressive residual stresses of more than −400 MPa in the AM samples and the effect exceeded an over 100 µm layer below the surface. Post-processing caused grain refinement and low-angle boundary formation on the sample surface layer and silicon carbide (SiC) residue adhesion, which should be taken into account when using the components. Immersion tests with four-point-bending in the heated 80 °C magnesium chloride solution for SCC showed no difference between AM and reference samples even after a 674 h immersion.

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Section: Introductionmentioning

confidence: 99%

Additive Manufactured 316L Stainless-Steel Samples: Microstructure, Residual Stress and Corrosion Characteristics after Post-Processing

Santa-aho

Kiviluoma

Jokiaho

et al. 2021

Metals

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“…By comparing the residual stress test with destructive evaluation and non-destructive evaluation (neutron diffraction method), it is evident that the deformation is predominantly visible on the prism specimens built in the horizontal direction and more confined on vertically built. The use of 45-degree off-axis scanning creates a reduction in residual stress [141]. For 316L stainless steel fabricated through selective laser melting (SLM) technique with high density gives good results in a corrosive atmosphere.…”

Section: Laser Powder Bed Fusion Additive Manufacturingmentioning

confidence: 99%

Conventional and Additively Manufactured Stainless Steels: A Review

Michla

Rajini

Krishnasamy

et al. 2021

Trans Indian Inst Met

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For the last three decades, enormous manufacturing processes have been widely employed in the field of transportation (aviation, automobile and marine) as well as various industrial sectors. Among the invented techniques, conventional manufacturing plays a versatile and cost effective role, but additive manufacturing (AM) possesses a more significant advantage of handling complicated parts or complex geometrical structures. The conventional processes were used from ancient times until the development of other advanced techniques. In recent development of technology, AM technology has shown a tremendous change in the manufacturing field. The process of development in AM began with polymers, then to composites and advanced to nanocomposites, continuously. AM provides a waste-free production management system with enhanced processes. Therefore, this detailed and compendious review describes the different stainless steels fabricated through conventional and AM techniques. It is evident that AM proves better than other several conventional techniques, by three dimensional (3D) printing of quality and complex stainless steels components that are impossible to manufacture through other methods. Notwithstanding, there still need of much efforts to improve AM technique by reducing the manufacturing cost, supporting mass production and printing large stainless steel components.With an increase in invention of various efficient state-of-the-art engineering software, robots in manufacturing, artificial intelligence and smart manufacturing, the aforementioned drawbacks of AM technique/3D printing of various stainless steel structures will be soon eradicated.

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“…Many researchers have reported post-fabrication heat treatment providing relief to the residual stresses effectively [17,18]. A few attempts made in the past showed that shot peening on metal AM parts exhibited the accumulation of high magnitude compressive stresses on the surface layer of the material [19][20][21]. Surface finishing using conventional machining processes has also been suggested to enhance the surface quality, and roughness parameters of metal AM parts [22,23].…”

Section: Introductionmentioning

confidence: 99%

Effect of post-fabrication treatments on surface residual stresses of additive manufactured stainless steel 316L

Kumar¹,

Aravindan²,

Vinoth³

et al. 2021

FME Transactions

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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.

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Enhancement of surface characteristics of direct metal laser sintered stainless steel 316L by shot peening

Cited by 45 publications

References 21 publications

Additive Manufactured 316L Stainless-Steel Samples: Microstructure, Residual Stress and Corrosion Characteristics after Post-Processing

Additive Manufactured 316L Stainless-Steel Samples: Microstructure, Residual Stress and Corrosion Characteristics after Post-Processing

Conventional and Additively Manufactured Stainless Steels: A Review

Effect of post-fabrication treatments on surface residual stresses of additive manufactured stainless steel 316L

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