scholarly journals Structural characterization of biomedical Co–Cr–Mo components produced by direct metal laser sintering

2015 ◽  
Vol 48 ◽  
pp. 263-269 ◽  
Author(s):  
G. Barucca ◽  
E. Santecchia ◽  
G. Majni ◽  
E. Girardin ◽  
E. Bassoli ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Laser Sintering ◽  
Direct Metal Laser Sintering

scholarly journals Tensile Properties Characterization of AlSi10Mg Parts Produced by Direct Metal Laser Sintering via Nested Effects Modeling

Materials ◽  
2017 ◽  
Vol 10 (2) ◽  
pp. 144 ◽  
Author(s):  
Biagio Palumbo ◽  
Francesco Del Re ◽  
Massimo Martorelli ◽  
Antonio Lanzotti ◽  
Pasquale Corrado
Keyword(s):  
Tensile Properties ◽  
Laser Sintering ◽  
Direct Metal Laser Sintering ◽  
Properties Characterization

scholarly journals Microstructural and Mechanical Characterization of a Custom-Built Implant Manufactured in Titanium Alloy by Direct Metal Laser Sintering

2014 ◽  
Vol 6 ◽  
pp. 945819 ◽  
Author(s):  
Maria Aparecida Larosa ◽  
André Luiz Jardini ◽  
Cecília Amélia de Carvalho Zavaglia ◽  
Paulo Kharmandayan ◽  
Davi Reis Calderoni ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Tests ◽  
Laser Sintering ◽  
Direct Metal Laser Sintering ◽  
X Ray Diffraction ◽  
Medical Field ◽  
X Ray ◽  
Craniomaxillofacial Surgery ◽  
The One

Custom-built implants manufacture has always presented difficulties which result in high cost and complex fabrication, mainly due to patients’ anatomical differences. The solution has been to produce prostheses with different sizes and use the one that best suits each patient. Additive manufacturing technology, incorporated into the medical field in the late 80's, has made it possible to obtain solid biomodels facilitating surgical procedures and reducing risks. Furthermore, this technology has been used to produce implants especially designed for a particular patient, with sizes, shapes, and mechanical properties optimized, for different areas of medicine such as craniomaxillofacial surgery. In this work, the microstructural and mechanical properties of Ti6Al4V samples produced by direct metal laser sintering (DMLS) are studied. The microstructural and mechanical characterizations have been made by optical and scanning electron microscopy, X-ray diffraction, and microhardness and tensile tests. Samples produced by DMLS have a microstructure constituted by hexagonal α′ martensite with acicular morphology. An average microhardness of 370 HV was obtained and the tensile tests showed ultimate strength of 1172 MPa, yield strength of 957 MPa, and elongation at rupture of 11%.

scholarly journals Characterization of Nickel Based Superalloys Processed Through Direct Metal Laser Sintering Technique of Additive Manufacturing

2015 ◽  
Vol 21 (S3) ◽  
pp. 465-466 ◽  
Author(s):  
Yaakov Idell ◽  
Carelyn Campbell ◽  
Lyle Levine ◽  
Fan Zhang ◽  
G. Olson ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Laser Sintering ◽  
Direct Metal Laser Sintering

scholarly journals From Powders to Dense Metal Parts: Characterization of a Commercial AlSiMg Alloy Processed through Direct Metal Laser Sintering

Materials ◽  
2013 ◽  
Vol 6 (3) ◽  
pp. 856-869 ◽  
Author(s):  
Diego Manfredi ◽  
Flaviana Calignano ◽  
Manickavasagam Krishnan ◽  
Riccardo Canali ◽  
Elisa Ambrosio ◽  
...  
Keyword(s):  
Laser Sintering ◽  
Direct Metal Laser Sintering ◽  
Metal Parts

Characterization of Internal Stresses in Hybrid Steel Structures Produced by Direct Metal Laser Sintering

2017 ◽  
Vol 885 ◽  
pp. 196-201 ◽  
Author(s):  
István Hatos ◽  
Hajnalka Hargitai ◽  
József Gábor Kovács
Keyword(s):  
Heat Treatment ◽  
Steel Structures ◽  
Hybrid Structure ◽  
Laser Sintering ◽  
Internal Stresses ◽  
Direct Metal Laser Sintering ◽  
Post Heat Treatment ◽  
Thick Part ◽  
Sintering Method

In this study hybrid structure were produced by direct metal laser sintering of maraging steel (MS1) powder onto the surface of commercial mold steels. The over-sintering method should be analyzed to find the optimum pre-and post-heat treatment to minimize the internal stresses. The internal stress is directly proportional to the deformation if the solid thick part is reduced to thin plate like parts. Based on this recognition the deformation of the plates over-sintered with MS1 could be analyzed in order to explore the internal stresses and the effect of different pre-and post-heat treatments were examined.

scholarly journals Effect of plasma nitriding of austenitic stainless steel produced by direct metal laser sintering

2021 ◽  
Vol 27 (4) ◽  
pp. 190-194
Author(s):  
Dorina Kovács ◽  
Dávid Miklós Kemény
Keyword(s):  
Surface Roughness ◽  
Raw Materials ◽  
Plasma Nitriding ◽  
Austenitic Stainless Steels ◽  
Laser Sintering ◽  
Direct Metal Laser Sintering ◽  
Direct Current Plasma ◽  
Wide Range ◽  
Optical Electron

A special additive manufacturing (AM), called as Direct Metal Laser Sintering (DMLS), is a technology that produces 3D workpieces using a wide range of different metals as raw materials. The aim of current research is to investigate the plasma nitriding effect on the DMLS produced samples. The direct current plasma nitriding treatment was achieved at 440 °C for 4 hours with 75%N2 – 25%H2 gas mixture. Before the treatment, the 316L austenitic stainless steels samples were ground with different methods to modify the surface roughness. Scanning electron microscope (SEM), X-ray diffractometer, glow discharge optical electron spectroscopy, Vickers microhardness tester and potentiodynamic corrosion test were used for the characterization of surface properties. The results demonstrated that the surface roughness did not affect the outcome of the plasma nitriding, but the corrosion resistance increases with the decrease of the surface roughness compared to the untreated 3D sample.

Characterization of acoustic signals during a direct metal laser sintering process

2017 ◽  
pp. 1315-1320 ◽  
Author(s):  
Dongsen Ye ◽  
Yingjie Zhang ◽  
Kunpeng Zhu ◽  
Geok Hong ◽  
Jerry Ying
Keyword(s):  
Acoustic Signals ◽  
Laser Sintering ◽  
Sintering Process ◽  
Direct Metal Laser Sintering

New ultrastructural findings about Borrelia burgdorferi by cryofixation, negative staining, thin sectioning and scanning techniques

1990 ◽  
Vol 48 (3) ◽  
pp. 582-583
Author(s):  
S. F. Hayes ◽  
M. D. Corwin ◽  
T. G. Schwan ◽  
D. W. Dorward ◽  
W. Burgdorfer
Keyword(s):  
Lyme Disease ◽  
Borrelia Burgdorferi ◽  
Structural Characterization ◽  
Negative Staining ◽  
Low Speed ◽  
Thin Sectioning ◽  
Ultrastructural Findings

Characterization of Borrelia burgdorferi strains by means of negative staining EM has become an integral part of many studies related to the biology of the Lyme disease organism. However, relying solely upon negative staining to compare new isolates with prototype B31 or other borreliae is often unsatisfactory. To obtain more satisfactory results, we have relied upon a correlative approach encompassing a variety EM techniques, i.e., scanning for topographical features and cryotomy, negative staining and thin sectioning to provide a more complete structural characterization of B. burgdorferi.For characterization, isolates of B. burgdorferi were cultured in BSK II media from which they were removed by low speed centrifugation. The sedimented borrelia were carefully resuspended in stabilizing buffer so as to preserve their features for scanning and negative staining. Alternatively, others were prepared for conventional thin sectioning and for cryotomy using modified procedures. For thin sectioning, the fixative described by Ito, et al.

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