scholarly journals Relationship between Phase Fractions and Mechanical Properties in Heat‐Treated Laser Powder‐Bed Fused Co‐Based Dental Alloys

2020 ◽  
Vol 60 (5-6) ◽  
pp. 607-614
Author(s):  
Jonas Kobylinski ◽  
Leonhard Hitzler ◽  
Robert Lawitzki ◽  
Christian Krempaszky ◽  
Andreas Öchsner ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dental Alloys ◽  
Powder Bed ◽  
Heat Treated

scholarly journals An investigation of the anisotropic properties of heat-treated maraging steel grade 300 processed by laser powder bed fusion

2021 ◽  
Author(s):  
Even W. Hovig ◽  
Amin S. Azar ◽  
Klas Solberg ◽  
Knut Sørby
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Maraging Steel ◽  
Image Correlation ◽  
Powder Bed Fusion ◽  
Material Models ◽  
Powder Bed ◽  
Melt Pool ◽  
Heat Treated ◽  
Anisotropic Mechanical Properties

AbstractIn order to explore the possibilities enabled by laser beam powder bed fusion of metals (PBF-LB/M), reliable material models are necessary to optimize designs with respect to weight and stiffness. Due to the unique processing conditions in PBF-LB/M, materials often develop a dominating microstructure that leads to anisotropic mechanical properties, and thus isotropic material models fail to account for the orientation-dependent mechanical properties. To investigate the anisotropy of 18Ni300 maraging steel, tensile specimens were built in seven different orientations. The specimens were heat treated at two different conditions and tested for their tensile properties using digital image correlation (DIC) technique. The microstructure and fracture surfaces are investigated with scanning electron microscope and electron backscatter diffraction. The tensile properties are typical for the material, with a yield strength in the range of 1850 MPa to 1950 MPa, and ultimate tensile strength in the range of 1900 MPa to 2000 MPa. The elastic modulus is 180 GPa, and the elongation at fracture is in the range of 2–6% for all specimens. The strain fields analysed with DIC reveals anisotropic straining in both the elastic and plastic parts of the flow curve for both direct ageing and solution treatment plus ageing specimens. In the former condition, the elastic anisotropy is dictated by the fraction of melt pool boundaries on the transverse surfaces of the specimens. When the material is solution treated prior to ageing, the melt pool boundary effect was supressed.

scholarly journals An Investigation of the Anisotropic Properties of Heat-Treated Maraging Steel Grade 300 Processed by Laser Powder Bed Fusion

2021 ◽  
Author(s):  
Even Wilberg Hovig ◽  
Amin S Azar ◽  
Klas Solberg ◽  
Knut Sørby
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Maraging Steel ◽  
Image Correlation ◽  
Powder Bed Fusion ◽  
Material Models ◽  
Powder Bed ◽  
Melt Pool ◽  
Heat Treated ◽  
Anisotropic Mechanical Properties

Abstract In order to explore the possibilities enabled by laser beam powder bed fusion of metals (PBF-LB/M), reliable material models are necessary to optimize designs with respect to weight and stiffness. Due to the unique processing conditions in PBF-LB/M, materials often develop a dominating microstructure that leads to anisotropic mechanical properties, and thus isotropic material models fail to account for the orientation-dependent mechanical properties. To investigate the anisotropy of 18Ni300 maraging steel, tensile specimens were built in seven different orientations. The specimens were heat treated at two different conditions and tested for their tensile properties using digital image correlation (DIC) technique. The microstructure and fracture surfaces are investigated with scanning electron microscope and electron backscatter diffraction. The tensile properties are typical for the material, with a yield strength in the range of 1850 MPa to 1950 MPa, and ultimate tensile strength in the range of 1900 MPa to 2000 MPa. The elastic modulus is 180 GPa, and the elongation at fracture is in the range of 2-6% for all specimens. The strain fields analysed with DIC reveals anisotropic straining in both the elastic and plastic parts of the flow curve for both direct ageing and solution treatment plus ageing specimens. In the former condition, the elastic anisotropy is dictated by the fraction of melt pool boundaries on the transverse surfaces of the specimens. When the material is solution treated prior to ageing, the melt pool boundary effect was supressed.

scholarly journals In Situ CT Tensile Testing of an Additively Manufactured and Heat-Treated Metastable ß-Titanium Alloy (Ti-5Al-5Mo-5V-3Cr)

2021 ◽  
Vol 11 (21) ◽  
pp. 9875
Author(s):  
Julius Hendl ◽  
Sina Daubner ◽  
Axel Marquardt ◽  
Lukas Stepien ◽  
Elena Lopez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Tensile Testing ◽  
Fusion Process ◽  
Fracture Mechanisms ◽  
Powder Bed Fusion ◽  
Complex Load ◽  
Powder Bed ◽  
Heat Treated

Additive manufacturing has been considered a suitable process for developing high-performance parts of medical or aerospace industries. The electron beam powder bed fusion process, EB‑PBF, is a powder bed fusion process carried out in a vacuum, in which the parts are melted using a highly focused electron beam. The material class of metastable β‑titanium alloys, and especially Ti‑5Al‑5Mo‑5V‑3Cr, show great potential for use as small and highly complex load-bearing parts. Specimens were additively manufactured with optimised process parameters and different heat treatments used in order to create tailored mechanical properties. These heat-treated specimens were analysed with regard to their microstructure (SEM) and their mechanical strength (tensile testing). Furthermore, in situ tensile tests, using a Deben CT5000 and a YXLON ff35 industrial µ‑CT, were performed and failure‑critical defects were detected, analysed and monitored. Experimental results indicate that, if EB‑PBF-manufactured Ti‑5553 is heat-treated differently, a variety of mechanical properties are possible. Regarding their fracture mechanisms, failure-critical defects can be detected at different stages of the tensile test and defect growth behaviour can be analysed.

scholarly journals Additively Manufactured Commercial Co-Cr Dental Alloys: Comparison of Microstructure and Mechanical Properties

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7350
Author(s):  
Dalibor Viderščak ◽  
Zdravko Schauperl ◽  
Sanja Šolić ◽  
Amir Ćatić ◽  
Matjaž Godec ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Backscatter Diffraction ◽  
The Other ◽  
Dental Alloys ◽  
Insufficient Information ◽  
Powder Bed ◽  
Metal Structures ◽  
Three Point Bending ◽  
Post Hoc ◽  
Backscatter Diffraction

Laser-powder bed fusion (LPBF) is one of the preferred techniques for producing Co-Cr metal structures for dental prosthodontic appliances. However, there is generally insufficient information about material properties related to the production process and parameters. This study was conducted on samples produced from three different commercially available Co-Cr dental alloys produced on three different LPBF machines. Identically prepared samples were used for tensile, three-point bending, and toughness tests. Light microscopy (LM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD) analyses of microstructure were performed after testing. Differences were observed in microstructures, which reflected statistically significant differences in mechanical properties (one-way analysis of variance (ANOVA) and Scheffé post hoc test (α = 0.05)). The material produced on the 3D Systems DMP Dental 100 had 24 times greater elongation ε than the material produced on the Sysma MySint 100 device and the EOS M100 machine. On the other hand, the material produced on the EOS M100 had significantly higher hardness (HV0.2) than the other two produced materials. However, the microstructure of the Sysma specimens with its morphology deviates considerably from the studied group. LPBF-prepared Co-Cr dental alloys demonstrated significant differences in their microstructures and, consequently, mechanical properties.

Static recrystallization impact on grain structure and mechanical properties of heat-treated Hastelloy X produced via laser powder-bed fusion

2021 ◽  
Vol 173 ◽  
pp. 110969
Author(s):  
Ali Keshavarzkermani ◽  
Reza Esmaeilizadeh ◽  
Pablo D. Enrique ◽  
Hamed Asgari ◽  
Norman Y. Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Static Recrystallization ◽  
Grain Structure ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Hastelloy X ◽  
Powder Bed ◽  
Heat Treated

scholarly journals INFLUENCE OF CRYOROLLING ON PROPERTIES OF L-PBF 316L STAINLESS STEEL TESTED AT 298K AND 77K

2019 ◽  
Vol 25 (4) ◽  
pp. 283
Author(s):  
Patrik Petrousek ◽  
Tibor Kvackaj ◽  
Róbert Kocisko ◽  
Jana Bidulska ◽  
Miloslav Luptak ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
316L Stainless Steel ◽  
Strength Properties ◽  
Powder Materials ◽  
Metal Production ◽  
Powder Bed ◽  
Heat Treated ◽  
Static Tensile ◽  
Cryogenic Conditions

<p class="AMSmaintext">The goal of the present work is to evaluate mechanical properties and to analyse the microstructure of 316L stainless steel produced by Laser Powder Bed Fusion (L-PBF) follow by rolling with different thickness reduction under ambient and cryogenic conditions. The samples before rolling were heat treated. The static tensile test was realized at ambient and cryogenic (77K) conditions. The L-PBF powder metal production technology approved that is a key technology in the AM area, especially for metal powder materials. Mechanical properties tested at 298K and 77K shows that the application of various thermo-deformation rolling conditions increases of strength properties. Achieved mechanical properties are comparable to conventional bulk materials. The strength properties after the rolling under ambient and cryogenic conditions were significantly increased.<strong></strong></p>

Crystallographic Differences of Metastable NI2MO in a NI-MO-AL Superalloy

1980 ◽  
Vol 38 ◽  
pp. 158-159
Author(s):  
Michael M. Kersker ◽  
E. A. Aigeltinger ◽  
J. J. IIren
Keyword(s):  
Mechanical Properties ◽  
Air Cooling ◽  
Solution Treated ◽  
Heat Treated ◽  
Metastable Compounds ◽  
Rapidly Solidified

Ni-rich alloys based on approximate ternary composition Ni-8Mo-15A1 (at%) are presently under investigation in an attempt to study the contribution, if any, of the profusion of Mo-rich NixMo metastable compounds that these alloys contain to their excellent mechanical properties. One of the alloys containing metastable NixMo precipitates is RSR 197 of composition Ni-8.96Mo-15.06A1-1.98Ta-.015Yt. The alloy was prepared at Pratt and Whitney Government Products Division, West Palm Beach, Florida, from rapidly solidified powder. The powder was canned under inert conditions and extruded as rod at 1315°C. The as-extruded rod, after air cooling, was solution treated at 1315°C for two hours, air cooled, and heat treated for one hour at 815°C, followed again by air cooling.

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