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Intergranular Corrosion of AISI 304 Heat Treated at 800℃ Varying Range Times

Journal of Chemistry and Chemical Engineering 2015年第4期9卷 262-268页

作者： Pedro Rupf Pereira Viana Luiza Venturini yasmin siqueira souza Metallurgical and Materials Engineering Departament Federal Institute of Espirito Santo Vitoria-ES 29040-780 Brazil Chemical Engineering Departament Pitfgoras College Linhares-ES 29901-398 Brazil

Austenitic stainless steels, when exposed to welding conditions or aging for length of service, it＇s observed the formation of numerous deleterious phases, such as several kinds of carbides type MC, M6C, M7C3, M23C6, and intermetallic secondary phases （sigma, chi, laves）, which cause the process of intergranular corrosion. The aim of this work was verifying the formation of the types of carbides and/or intermetallic phases existing in the stainless AISI 304 at 800 ℃, varying the timing of heat treatment between 30, 360 and 1,440 min. The optical microscopy analysis revealed the predominant formation of the carbide type M23C6. The results of DL-EPR （double loop electrochemical potentiokinetic reactivation） tests showed a gradual increase in the precipitation of this carbide with the increase of treatment time. The potentiodynamic polarization showed that the precipitation of this carbide reduce the formation of the Cr2O3 passive layer, suggesting that the precipitate carbide to be predominantly of the Cr23C6 type.

关键词： Intergranular corrosion M23C6 DL-EPR pitting corrosion.

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Highlighting COVID-19:What the imaging exams show about the disease

引用

World Journal of Radiology 2021年第5期13卷 122-136页

作者： Lorena Sousa de Carvalho Ronaldo Teixeira da Silva Júnior Bruna Vieira Silva Oliveira yasmin Silva de Miranda Nara Lúcia Fonseca Rebouças Matheus Sande Loureiro Samuel Luca Rocha Pinheiro Regiane Santos da Silva Paulo Victor Silva Lima Medrado Correia Maria José souza Silva Sabrina Neves Ribeiro Filipe Antônio França da Silva Breno Bittencourt de Brito Maria Luísa Cordeiro Santos Rafael Augusto Oliveira Sodré Leal Márcio Vasconcelos Oliveira Fabrício Freire de Melo Department of Instituto Multidisciplinar em Saúde Universidade Federal da BahiaVitória da Conquista 45029-094BahiaBrazil

Coronavirus disease 2019(COVID-19),a global emergency,is caused by severe acute respiratory syndrome coronavirus *** gold standard for its diagnosis is the reverse transcription polymerase chain reaction,but considering the high number of infected people,the low availability of this diagnostic tool in some contexts,and the limitations of the test,other tools that aid in the identification of the disease are *** this scenario,imaging exams such as chest X-ray(CXR)and computed tomography(CT)have played important *** is useful for assessing disease progression because it allows the detection of extensive consolidations,besides being a fast and cheap *** the other hand,CT is more sensitive for detecting lung changes in the early stages of the disease and is also useful for assessing disease *** note,ground-glass opacities are the main COVID-19-related CT *** emission tomography combined with CT can be used to evaluate chronic and substantial damage to the lungs and other organs;however,it is an expensive *** ultrasound(LUS)has been shown to be a promising technique in that context as well,being useful in the screening and monitoring of patients,disease classification,and management related to mechanical ***,LUS is an inexpensive alternative available at the ***,magnetic resonance imaging,although not usually requested,allows the detection of pulmonary,cardiovascular,and neurological abnormalities associated with ***,it is important to consider the challenges faced in the radiology field in the adoption of control measures to prevent infection and in the follow-up of post-COVID-19 patients.

关键词： SARS-CoV-2 COVID-19 Pneumonia Pandemic Radiology Tomography

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