Dynamic Versus Quasi Static Fracture Toughness of Additively Manufactured AlSi10Mg Alloy by Selective Laser Melting Technique

Selective Laser Melting (SLM) is currently one of the more advanced manufacturing and prototyping processes, allowing the 3D-printing of complex parts through the layer-by-layer deposition of powder materials melted by laser. This work concerns the study of the fracture toughness of maraging AISI 18Ni300 steel implants by SLM built over two different conventional steels, AISI H13 and AISI 420, ranging the scan rate between 200 mm/s and 400 mm/s. The SLM process creates an interface zone between the conventional steel and the laser melted implant in the final form of compact tension (CT) samples, where the hardness is higher than the 3D-printed material but lower than the conventional steel. Both fully 3D-printed series and 3D-printed implants series produced at 200 mm/s of scan rate showed higher fracture toughness than the other series built at 400 mm/s of scan rate due to a lower level of internal defects. An inexpressive variation of fracture toughness was observed between the implanted series with the same parameters. The crack growth path for all samples occurred in the limit of interface/3D-printed material zone and occurred between laser melted layers.

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Fabrication of magnesium using selective laser melting technique

Rapid Prototyping Journal ◽

10.1108/13552541111184206 ◽

2011 ◽

Vol 17 (6) ◽

pp. 479-490 ◽

Cited By ~ 56

Author(s):

Chi Chung Ng ◽

Monica Savalani ◽

Hau Chung Man

Keyword(s):

Selective Laser Melting ◽

Laser Melting ◽

Melting Technique

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Fracture Toughness Behaviour of 316L Stainless Steel Samples Manufactured Through Selective Laser Melting

Volume 6A: Materials and Fabrication ◽

10.1115/pvp2018-84393 ◽

2018 ◽

Cited By ~ 2

Author(s):

Catrin M. Davies ◽

Ruijan Zhou ◽

Olivia Withnell ◽

Richard Williams ◽

Tobias Ronneberg ◽

...

Keyword(s):

Heat Treatment ◽

Fracture Toughness ◽

Selective Laser Melting ◽

316L Stainless Steel ◽

Compact Tension ◽

Crack Plane ◽

Laser Melting ◽

Growth Plane ◽

Toughness Testing ◽

Tension Fracture

Selective laser melting (SLM) is a relatively new manufacturing technique which offers many benefits. However the utilisation of SLM manufactured components depends on the assurance of their integrity during operation. Fracture toughness testing (JIC) has been performed on as-built compact tension fracture mechanics samples manufactured in three orthogonal directions. When the crack growth plane was transverse to the interface of the build layers, the fracture toughness values were found to be similar to those manufactured using conventional techniques. However, the fracture toughness is significantly reduced when the crack plane is parallel to the interface of the build layers. Simple heat treatments have been performed on Charpy fracture samples and the resulting impact energy values indicate that the fracture toughness of a component may be improved by heat treatment.

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