Case Hardening
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Oxandrolona no tratamento da lipodermatoesclerose: relato de caso
Resumo A lipodermatoesclerose é uma paniculite que se caracteriza por endurecimento e hiperpigmentação da pele envolvendo as panturrilhas, com a aparência de “garrafa de champanhe invertida”. Muitas abordagens terapêuticas têm sido recomendadas, mas o uso de oxandrolona para essa finalidade foi pouco estudado até o momento. Relatamos um caso de li
J. vasc. bras.. Publicado em: 07/11/2019
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2. Strain Hardening of Carbon Steel During Wire Drawing
The Avitzur's limit analysis for the calculation of the drawing force in a wire drawing process is used to study the real behaviour of a carbon steel in an industrial case. The linear hardening assumption, used by Avitzur only for the first step, is extended to the whole process and tested against experimental data. The result shows that the predictions resu
Mat. Res.. Publicado em: 12/03/2018
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3. Myiasis associated with an invasive ductal carcinoma of the left breast: case study
ABSTRACT Most breast cancers originate in the ductal epithelium and are referred to as invasive ductal carcinoma. In this study we report on the clinical procedures adopted to diagnose myiasis in association with infiltrating metastatic breast carcinoma in a female patient. A 41 years old woman came to the Federal Hospital of Andaraí complaining of intense
Rev. Inst. Med. trop. S. Paulo. Publicado em: 01/06/2017
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4. Analysis of precipitate density of an aluminium alloy by TEM and AFM
Abstract The quantification of nanometric precipitates in Al-Zn-Mg-Cu alloys has been performed by a series of experimental techniques. Especially in the AA7050 alloy, after ageing heat treatment, the particles responsible for the hardening become very thin. Typically, these precipitates of nanometric sizes are mainly characterized by transmission electron m
REM, Int. Eng. J.. Publicado em: 2016-12
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5. Progressive deformation behaviour of thin cylindrical shell under cyclic temperature variation using Combined Hardening Chaboche Model
This study intends to evaluate thermal ratchetting deformation due to cyclic thermal loading along the axis of a smooth cylindrical shell. Two cases of progressive deformation behaviour are discussed for different loading methods. The aim of the first case is to recognize the shakedown behaviour of the cylinder under applied loading cycles. Alternatively, se
Lat. Am. j. solids struct.. Publicado em: 2014-11
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6. Case depth in SAE 1020 steel using barkhausen noise
The most widely used thermochemical process for surface hardening of steels is case hardening. Using several different heat treatments, martensitic surface layers were formed on SAE 1020 steel into which carbon had been diffused. Case depths were measured by traditional destructive techniques. Barkhausen noise measurements were made and both the RMS Barkhaus
Mat. Res.. Publicado em: 18/06/2013
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7. Análise do comportamento eletroaeroelástico de uma seção típica para geração piezelétrica de energia / Electroaeroelastic behavior analysis of a typical section for piezoelectric energy harvesting
Converting aeroelastic vibrations into electricity for low power generation has received growing attention over the past few years. In addition to potential applications for aerospace structures, the goal is to develop alternative and scalable configurations for wind energy harvesting to use in wireless electronic systems. The use of a typical airfoil sectio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/02/2012
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8. Analysis by design of experiments of distortion potentials in drawn and induction hardened wire
In this investigation a DoE (Design of Experiments) analysis of distortion for a typical manufacturing process of pre-straightened, cold drawn and induction hardened AISI 1045 cylindrical steel bars was carried out. A careful characterization of the material, including residual stress states and geometrical changes, was done for the different manufacturing s
Materials Research. Publicado em: 24/02/2012
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9. Ultrafine grained structure development in steel with different initial structure by severe plastic deformation
The present work deals with grain refinement of medium carbon steel, having different initial microstructure, modified by either thermal and/or thermomechanical treatment (TM) prior severe plastic deformation. In case of TM treated steel, structure refinement was conducted in two steps. Preliminary structure refinement has been achieved due to multistep open
Matéria (Rio de Janeiro). Publicado em: 2010
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10. Estudo do encruamento dos aços AISI 304 e AISI 409 com uso da técnica de cisalhamento planar simples
This research analyzed the effect of successive changes in the strain path of AISI 304 (type 304N) and AISI 409 stainless steel sheets on their work hardening behavior. Plastic deformation was imposed on these materials employing successive simple planar shear, tension or plane strain. These steels were chosen because of their contrasting work hardening beha
Publicado em: 2009
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11. Effects of carburization time and temperature on the mechanical properties of carburized mild steel, using activated carbon as carburizer
Due to the complexity of controlling parameters in carburization, there has been relatively little work on process variables during the surface hardening process. This work focuses on the effects of the carburizing temperature and time on the mechanical properties of mild steel carburized with activated carbon, at 850, 900 and 950 ºC, soaked at the carburiz
Materials Research. Publicado em: 2009
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12. Numerical analysis of the tunnelling with emphases in the ground-support interaction in shotcrete at early ages / Análise numérica de escavações subterrâneas com ênfase na interação entre o maçiço e o suporte em concreto projetado a baixas idades
This thesis presents a numerical analysis of the ground/support interaction, considering the transient behavior of the shotcrete while the gradual loading of the support occurs, due to progressive advance of the excavation face. The numerical analyses were carried out according to the finite elements method in tunnelling with circular section, under various
Publicado em: 2008