Investigating Discrepancies in Vibration Bending Fatigue Behavior of Additively Manufactured Titanium 6Al-4V

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Onome Scott-Emuakpor ◽  
Casey Holycross ◽  
Tommy George ◽  
Luke Sheridan ◽  
Emily Carper ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Fatigue Life ◽  
Scanning Electron Microscope ◽  
Stress Amplitude ◽  
Fatigue Behavior ◽  
Sem Analysis ◽  
Bending Fatigue ◽  
Grain Structures ◽  
Life Model ◽  
Scanning Electron

The vibration bending fatigue life uncertainty of additively manufactured titanium (Ti) 6Al-4V specimens is studied. In this investigation, an analysis of microscopic discrepancies between ten fatigued specimens paired by stress amplitude is correlated with the bending fatigue life scatter. Through scanning electron microscope (SEM) analysis of fracture surfaces and grain structures, anomalies and distinctions such as voids and grain geometries are identified in each specimen. These data along with previously published results are used to support assessments regarding bending fatigue uncertainty. The understanding gained from this study is important for the future development of a predictive vibration bending fatigue life model.

Investigating Discrepancies in Vibration Bending Fatigue Behavior of Additively Manufactured Titanium 6Al-4V

2018 ◽  
Author(s):  
Onome Scott-Emuakpor ◽  
Casey Holycross ◽  
Tommy George ◽  
Luke Sheridan ◽  
Emily Carper ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Stress Amplitude ◽  
Fatigue Behavior ◽  
Sem Analysis ◽  
Concentration Effects ◽  
Bending Fatigue ◽  
Grain Structures ◽  
Life Model ◽  
Microscopic Features ◽  
Cold Rolled

The vibration bending fatigue life uncertainty of additively manufactured Titanium (Ti) 6Al-4V specimens is studied. In this investigation, an analysis of microscopic discrepancies between 10 fatigued specimens paired by stress amplitude is correlated to the bending fatigue life scatter. Through scanning electron microscope (SEM) analysis of fracture surfaces and grain structures, anomalies and distinctions such as voids and grain geometries are identified in each specimen. This data along with previously published results are used to support assessments regarding bending fatigue uncertainty. Corrections on stress and scatter based on microscopic features are implemented to the stress versus fatigue life comparisons. The results of this investigation show that the bending fatigue life uncertainty can be bounded by cold-rolled Ti 6Al-4V data when correcting the tested stress amplitude values with stress concentration effects and variation due to microstructure geometries. The understanding gained from this study is important for future development of a predictive vibration bending fatigue life model that will include the probability of geometry, density, and location of voids as an artifact of LPBF build parameters.

Preparation and Characterization of Ni/ZrCoCe Stack Getter Films

2019 ◽  
Vol 944 ◽  
pp. 619-624
Author(s):  
Peng Yuan ◽  
Yao Zong Sui ◽  
Xiao Zhang ◽  
Hao Liu ◽  
Feng Wei ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Magnetron Sputtering ◽  
Film Surface ◽  
Protective Layer ◽  
Sem Analysis ◽  
And Diffusion ◽  
Highly Porous ◽  
Scanning Electron

In order to improve the oxidation resistance of the ZrCoCe getter, highly porous Ni/ZrCoCe stack getter films were grown by the magnetron sputtering method. Scanning electron microscope (SEM) analysis indicate that the Ni/ZrCoCe stack film is composed of isolated columns. The film surface with cauliflower-like topography is formed among finely packed nanocrystals. Gas sorption investigation shows that the Ni/ZrCoCe stack film can be activated at 300 °C for 30 min and exhibits more favorable sorption capability than ZrCoCe bi-layered film. XPS results show that the Ni protective layer can play an important role in protecting the ZrCoCe film against oxidation. It can also improve the surface dissociation and diffusion of H2.

Oxidation of Manganese-Containing Aluminum Alloys Studied by SEM

2014 ◽  
Vol 794-796 ◽  
pp. 1095-1100
Author(s):  
Shawn C. Wilson ◽  
Anne Kvithyld ◽  
Thorvald Abel Engh ◽  
Gabriella Tranell
Keyword(s):  
Electron Microscope ◽  
Chemical Composition ◽  
Scanning Electron Microscope ◽  
Oxide Film ◽  
Current Knowledge ◽  
Sem Analysis ◽  
Muffle Furnace ◽  
Mn Content ◽  
Small Clusters ◽  
Scanning Electron

During remelting of aluminum manganese-containing alloys, some industrial experience has indicateda tendency toward increased oxidation losses when compared to unalloyed Al. A goal of thiswork is to increase current knowledge of oxidation of Mn-containing aluminum. An oxidation studywas performed on 99.99% Al, Al-1%Mn and Al-5%Mn materials in a muffle furnace in air. Theseoxidized materials were analyzed in the Scanning Electron Microscope using Energy Dispersive xraySpectroscopy (EDS) both for chemical composition and to analyze the structure of the oxide thatwas formed. The main findings from the SEM analysis of the oxidized 99.99% Al, Al1%Mn andAl5%Mn materials are: 1) The oxides formed on the Al1Mn and Al5Mn materials contained onlyminute amounts of Mn. However, small clusters of Mn metal were found among the Al2O3 particleson the surface of the Al1Mn and Al5Mn samples. 2) Dissolved Mn increased from the surface to theinterior, and Mn-rich particles were present in the interior of the Al1Mn and Al5Mn samples. 3) Theoxide layer thickness increases with Mn content, and the oxide film is more fragmented.

SEM Analysis on a New Kind of Phosphate Flame Retardant

2011 ◽  
Vol 347-353 ◽  
pp. 2223-2226
Author(s):  
Hua Fei
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Bisphenol A ◽  
Flame Retardant ◽  
Sem Analysis ◽  
Char Layer ◽  
Abs Resin ◽  
Scanning Electron

The microscope characters of flame-retardant PC/ABS by a new kind of phosphate flame retardant, bisphenol-a bis (dipenyl phosphate) (BDP), is carried out in this paper using Scanning Electron Microscope (SEM). The result shows that flame retardant and unflame retardant materials before combustion and after indicate that these lame retardant materials after combustion shape countless closed holes which form sprangly cellular coking char layer, which also make out that BDP play the condensation flame retardant role in PC/ABS resin.

The Effect of CaCO3 Addition on Physical Properties of ZnO-Based Crystal Glaze

2012 ◽  
Vol 620 ◽  
pp. 12-16 ◽  
Author(s):  
Abdul Rashid Jamaludin ◽  
Shah Rizal Kasim ◽  
Zainal Arifin Ahmad
Keyword(s):  
Electron Microscope ◽  
Calcium Carbonate ◽  
Scanning Electron Microscope ◽  
Physical Properties ◽  
Crystallization Temperature ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

The effects of calcium carbonate (CaCO3) addition on the physical properties of ZnO-based crystal glaze batches were investigated. Samples were fired at different gloss firing temperatures ranging from 1180-1220°C with 3 hours soaking at 1060°C crystallization temperature. X-ray diffraction (XRD) analysis identifiedthe crystal phase occurred as willemite (Zn2SiO4) and the scanning electron microscope (SEM) analysis indicated that willemite crystals are in the acicular needle like shape that formed spherulite. The intensities of willemite peaks decreased with CaCO3 addition and completely vanished at 5.0 wt% CaCO3. Varied formation of spherulites developed of the surface of crystal glaze as the flows of the glaze stretched further as the amount of CaCO3 increased.

SEM analysis of dental enamel morphological structures on the basis of their replicas in patients with systemic calcium deficiency

2009 ◽  
Vol 4 (2) ◽  
pp. 190-195
Author(s):  
Ewa Bałczewska ◽  
Leszek Klimek ◽  
Aleksandra Palatyńska-Ulatowska
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Periodontal Diseases ◽  
Dental Enamel ◽  
Microscopic Analysis ◽  
Calcium Deficiency ◽  
Sem Analysis ◽  
Mineral Density ◽  
Dental Tissues ◽  
Scanning Electron

AbstractThe aim of the present study is to examine microscopically the surface of dental enamel by using a scanning electron microscope (SEM), using their replicas formed in female patients with diagnosed periodontal diseases and systemic calcium deficiency. Replicas of dental enamel surfaces in patients referred for treatment of periodontal diseases were subjected to microscopic analysis. The replicas, after coating with platinum-palladium alloy, were examined under the scanning electron microscope at magnifications of 15–5000 x. Densitometric examinations of spine (L2 - L4 segment) revealed bone mineral density BMD T-score lower than −2.5 in 5 patients, in the range of −1.5 to −2.5 in 10 patients, and higher than −1.5 in the remaining patients. Non-homogenous images of surfaces in the form of light and dark areas were observed. Light areas corresponded to damaged surfaces of dental tissues. Patients with higher systemic calcium deficiency had areas lighter in color. More of these areas were found in patients with higher systemic calcium deficiency. It can be assumed that the calcium deficit is likely to appear in the selected dental tissues, particularly in the dental enamel.

scholarly journals Characterization of Fe Doped AC/TiO2

2019 ◽  
Vol 8 (12S) ◽  
pp. 1146-1147
Keyword(s):  
Activated Carbon ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Anatase Phase ◽  
Sol Gel ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Abstract: The photocatalytic composite Fe doped AC/TiO2 has been prepared by sol-gel method. The prepared Fe doped AC/TiO2 composite were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD).The SEM analysis showed that Fe and TiO2 were attached to the Activated Carbon surfaces. The X-Ray Diffraction data showed that Fe doped AC/TiO2 composite mostly contained anatase phase.

scholarly journals The Effect of Root Canal Taper on the Removal of Smear Layer Using Different Irrigating Solutions: A Scanning Electron Microscope Study

2014 ◽  
Vol 02 (03) ◽  
pp. 138-144
Author(s):  
Atul Jain ◽  
Sonal Sinha ◽  
Rachana Bahuguna ◽  
Neeraj Kumar ◽  
Raju Chauhan
Keyword(s):  
Electron Microscope ◽  
Citric Acid ◽  
Scanning Electron Microscope ◽  
Root Canal ◽  
Electron Microscope Study ◽  
Sem Analysis ◽  
Smear Layer ◽  
Irrigation Regime ◽  
Scanning Electron Microscope Study ◽  
Scanning Electron

Abstract Aim: This study was carried out to evaluate the combined effect of taper and different irrigating agents on the cleanliness of root canal. Materials & Methods: 45 extracted mandibular premolars were divided into three groups, according to the taper produced, 2%, 4% and 6% with Hero Shaper files respectively, which were further divided into subgroups, according to the irrigation regime followed. The teeth were split and subjected to SEM analysis. Results: The results showed that the canals prepared to a taper of 6% and irrigated with 5.2% NaOCl and 25% Citric acid had less debris and smear layer, which was statistically significant. Conclusion: It was concluded that a taper of 6% facilitates irrigant delivery in the canal and 25% Citric acid is more potent demineralising agent than 17% EDTA.

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