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Tensile Properties of Additively Manufactured C-18150 Copper Alloys
Congyuan Zeng,Hao Wen,Benjamin C. Bernard,Huan Ding,Jonathan R. Raush,Paul R. Gradl,Michael Khonsari,Shengmin Guo 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
The efect of aging processes on the tensile properties of C-18150 copper alloy samples, made by laser powder-bed-fusionadditive manufacturing (AM) process with three diferent fabrication orientations (horizontal, angled, and vertical to the builddirection), are investigated. For the as-fabricated C-18150 AM parts, horizontal and angled fabrication directions result inmarginally better tensile strengths and much improved strain-to-failure values than those of vertically built AM parts. Afterthe aging treatment, tensile strength can be signifcantly enhanced with a sacrifce of the strain-to-failure value. Moreover,the highest tensile strength is achieved by treating the as-fabricated samples at an aging temperature of 500 °C for 2 h. At800 °F (427 °C), both tensile strength and ductility are smaller than low temperature values (room temperature and 400 °F/204 °C). Phase constituents, microstructure, and composition distribution of the AM parts are characterized to gain insightinto the measured tensile properties.
( Bernard Benjamin P Albano ),( Josephine C Gutierrez ),( Jose P Tirona ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Identifi cation of outcome predictors in stroke remains important for the application of early aggressive treatment and establishment of a reliable prognosis. Methods: The objective was to determine the clinical characteristics of Filipino patients with hemorrhagic stroke and identify parameters that predict early neurological deterioration (END) and death. Charts of hemorrhagic stroke patients that met the inclusion criteria were reviewed. Relevant data on admission were recorded. Canadian Stroke Score (CSS) and Glasgow Coma Scale (GCS) on the fi rst 3 hospital days and mortality at any time during hospital stay were also recorded. Results: Eighty-eight patients were included (49 male), mean age was 56.7+12.9. The most common presenting symptom was hemiparesis (29.5%), and the most common location was striatocapsular (31.8%). Forty nine patients (55.7%) had severe stroke and 31 (35.2%) had severe impairment of consciousness. Fifty six patients (67%) had ECG abnormalities. The incidence of END was 38.6% (95%CI 28.9, 49.1), while in-hospital mortality rate was 29.5% (95% CI 20.7, 39.7). Conclusions: Independent predictors of in-hospital death were high systolic blood pressure (SBP), “severe” stroke, presence of intra-ventricular (IV) extension and subarachnoid hemorrhage (SAH). Independent predictors of END were high SBP, “severe” stroke and presence of leukocytosis. In hemorrhagic stroke, the ECG score has a role in risk stratifi cation and that aggressive SBP reduction may signifi cantly reduce the occurrence of END and in-hospital mortality.