Hydrogen Embrittlement
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Tensile Armor Wires Submitted to Slow Strain Rate Tests in a Corrosive Environment and Cathodic Protection: a Comparison Between Two Different Microstructures
Tensile armor in flexible pipes consists of two or more layers of steel wires. Damage to the outer sheath may cause ingress of seawater in the annular space and thus corrosion of the armor wires. This work focused on the susceptibility of these wires to stress corrosion cracking (SCC) and hydrogen embrittlement (HE) using a slow strain rate test (SSRT) under
Mat. Res.. Publicado em: 06/05/2019
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2. The Hydrogen Cold Work Peak in BCC Iron: Revisited, with First Principles Calculations and Implications for Hydrogen Embrittlement
We examine experimental and theoretical results on the cold-work (Snoek-Köster) peak in bcc Fe due to H using density functional theory (DFT). We reaffirm that Seeger’s interpretation of the H cold-work peak (Hcwp), involving motion of H with kinks on non-screw dislocations associated with the intrinsic-dislocation α peak, has experimental backing. Use o
Mat. Res.. Publicado em: 21/06/2018
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3. In Situ Synchrotron Radiation Measurements During Axial Strain In Hydrogen Cathodically Charged Duplex Stainless Steel SAF 2205
The objective of this work is the evaluation of hydrogen effects on the martensitic transformation and strain hardening in Duplex Stainless Steels (DSS) SAF 2205 (UNS S32205/S31803). DSS are two-phase alloys (austenite and ferrite), which are used for applications requiring high mechanical strength, in corrosive environments. Therefore, it is necessary a bet
Mat. Res.. Publicado em: 18/12/2017
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4. Influence of Hydrogenation on Residual Stresses of Pipeline Steel Welded Joints
Hydrogen embrittlement is a phenomenon that affects the performance of steel used for oil and gas pipelines. This paper presents a study of the effect of hydrogenation on the residual stresses of an API 5L X65 steel pipe. Residual stresses were analyzed by X-ray diffraction technique using the sin2Ψ method. The hydrogenation of base metal and welded joint s
Mat. Res.. Publicado em: 15/08/2016
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5. Fragilização por hidrogênio nos aços AISI 4340 (AMS 6414K e AMS 6415S) temperados e revenidos / Hydrogen embrittlement in AISI 4340 steel (AMS 6414K and AMS 6415S) quenched and tempered
O fenômeno da fragilização por hidrogênio no aço AISI 4340 foi investigado devido ao fato do mesmo ser um aço baixa liga de alta resistência bastante suscetível a este fenômeno. A análise foi feita por meio do ensaio de tenacidade à fratura por flexão baseado na norma ASTM E 399 - 09. A matéria prima utilizada foi fabricada segundo dois diferent
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/02/2012
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6. Fragilização por hidrogênio de parafusos cementados / Hydrogen embrittlement of carburized bolts
The main aim of this work is to investigate the effects on hydrogen embrittlement of bolts due to acid pickling, baking, and strip processes performed during zinc plating. Carburized bolts type "hexagon flange head tapping screws", with 6 mm of diameter and 16 mm of thread length were organized into 39 different groups. Acid pickling was evaluated using volu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
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7. Comparação do efeito da fragilização por hidrogênio em aços com resistência à tração acima de 1000 MPa
Este trabalho tem por objetivo avaliar os efeitos do hidrogênio em três diferentes tipos de aços de alta resistência mecânica. São descritos os fenômenos de introdução, difusão e aprisionamento de hidrogênio (H) dentro dos metais, em conjunto com os diferentes tipos de danos provocados devido à presença do hidrogênio. Os materiais de estudo sã
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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8. Effect of hidrogen charging NS4 solution on properties of API 5L X-65 steel / Efeito da hidrogenação em solução NS4 nas propriedades do aço API 5L X-65
O comportamento do aço API 5L X65 foi estudado em solução sintética NS4. Estudou-se o efeito da hidrogenação ao aplicar um potencial catódico nas amostras de tração e de impacto Charpy. Estas amostras foram imersas em solução saturada de sulfato de cobre para evitar a saída de hidrogênio, sendo posteriormente foram testadas à tração e ao impa
Publicado em: 2010
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9. Environmentally induced cracking of API grade steel in near-neutral pH soil
Environmentally induced cracking of pipeline steels in contact with soil have been investigated. Different soils were prepared in order to determine their physical, chemical and bacteriological characteristics. Slow strain rate testing was carried out by using electrolytes obtained from soil samples and NS4 standard solution. Stress vs. strain curves of API
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-06
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10. Effects of the geometrie, of the axial force and of the rotation in the friction welding repair / Efeitos da geometria, da força axial e da rotação no reparo por atrito
Interventions made in the oil industry for repairs in structures and mechanical components, represents nowadays high financial costs. It is even worse since the operations are made in explosion risk areas. The electric arc welding is one of the most common techniques in this kind of repair. However, this technique has many inconveniences, some of them are: h
Publicado em: 2007
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11. Desenvolvimento de um simulador para problemas multi-fÃsicas
Simulation of coupled natural phenomena, such as the evolution of material damage due to mechanical and chemical loads, are becoming more and more important in the engineering pratice. This was influenced by the growth of Computational Mechanics software industry. Despite the computational advance, it still applies software engiheering development techniques
Publicado em: 2007
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12. Development, design and construction of a friction hydro pillar processing equipment / Desenvolvimento, projeto de construção de um equipamento de reparo de trincas por atrito
In the offshore industry, the utilization of conventional process of arc welding processes are frequently used to repair structure defects, such as cracks. These repairs are carried out under water to reduce risks of explosion. Under water welds are subjected to hydrogen embrittlement and severe porosity. An alternative is offered by the friction hydro pilla
Publicado em: 2006