Heat Treatment Of Metals
Mostrando 13-24 de 27 artigos, teses e dissertações.
-
13. An elastoplastic numerical model of rolling contact applied to analyze the fatigue of railroad wheels / Modelo numerico elastoplastico de contato com rolamento aplicado a analise de fadiga de rodas ferroviarias
This work proposes a wheel-rail contact model based on finite element method to estimate the fatigue life to shelling, until the beginning of the crack of a railroad wheel class C of a heavyhull Brazilian railroad from Serra dos Carajás. The main contribution of this work is the elastoplastic approach with the inclusion of the residual stress generated by t
Publicado em: 2008
-
14. Age-hardening of Ti-35Nb-7Zr-5Ta alloy for orthopaedic implants
Bone injuries and failures often require the inception of implant biomaterial. Research in this field has received increasing attention recently. In particular, porous metals are attractive due to its unique physical, mechanical, and new bone tissue ingrowth properties. The aim of this work is to investigate age hardening behavior of Ti-35Nb-7Zr-5Ta alloy pr
Materials Research. Publicado em: 2007-09
-
15. Avaliação da remoção mono e multicomponente de Cu, Zn e Ni em argila bentonita nacional / Cu, Zn and Ni single and multicomponente study using Bentonite
Continuous technological development leads inevitably to residue generation. These grow in volume and toxicity as the increase of industrial processes complexity grow. Due to their high toxicity and non biodegradability, heavy metals specifically can, in extremely low concentrations, be harmful to human health and the environment under any type of exposure.
Publicado em: 2007
-
16. Estudo do comportamento ao desgaste e corrosÃo dos aÃos inoxidÃveis AISI 316L e AISI 420 depositados pelo processo de aspersÃo tÃrmica a arco elÃtrico
Mechanical components behavior in service, are extremely dependent on the surface quality, the contact between areas and the environment where they are applied. Particularly, corrosion and ware damage, directly and indirectly, mechanical components surface that result in rise production and maintenance cost due to no programmed equipments stops to repair or
Publicado em: 2007
-
17. Normalizing heat treatment effect on low alloy steel weld metals
In equipment manufacturing, there are occasions that the base metal (BM) need to be hot or cold worked prior to welding. After welding, the components have to be submitted to a normalizing heat treatment in order to recover its original mechanical properties. In this work four different low alloy steel weld metals (WM) both in the as welded condition and aft
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2004-03
-
18. Study about the influence of the agitation and the severity of state of hardness of the cooling middle in the determination of critical speeds of state of hardness / Estudo da influencia da agitação e da severidade de tempera do meio de resfriamento na determinação de velocidades criticas de tempera
Estuda-se a influência da variação da agitação e da severidade de têmpera do meio de resfriamento sobre as curvas e taxas de resfriamento durante o processo de têmpera do aço. Os ensaios foram realizados com amostras dos aços 1045, 8620 e 8640, temperadas em água e salmoura, promovendo-se a variação do estado de agitação do refrigerante. Os dad
Publicado em: 2004
-
19. Electrochemical studies on the biocompatible alloys Ti-50Zr (at.%) and Ti-13Nb-13Zr (m/m). / Estudos eletroquímicos das ligas biocompatíveis Ti-50Zr (at.%) e Ti-13Nb-13Zr (m/m).
Studies on the anodic growth of the oxides that passivate the biocompatible alloys Ti-50Zr (at.%) and Ti-13Nb-13Zr (m/m), on the electrochemical/electrical parameters and the morphology, composition and structure of these oxides were carried out in this work. The oxides were grown by both the potentiodynamic and the galvanostatic routes, in different electro
Publicado em: 2004
-
20. CORRELAÇÃO ENTRE MICROESTRUTURA E PROPRIEDADES MECÂNICAS EM METAL DE SOLDA COM DIFERENTESTEORES DE MN, SUBMETIDO A TRATAMENTOS TÉRMICOS / MICROSTRUCTURE AND MECHANICAL PROPERTIES CORRELATIONS FOR HEATTREATED STEEL WELD METALS WITH DIFFERENT MN CONTENT
Traditionally, both Cr-Mo class steels and the weld metals produced in joining such materials have been considered to be susceptible to the phenomenon of temper embrittlement. The current study evaluates 2,25%Cr-1,0%Mo type weld metals with varying Mn levels (0,4%- 1,1%), produced using coated electrodes with an SMAW process. The welded joints were subjected
Publicado em: 2002
-
21. STUDY OF THE USE OF MAGNETITE AS ADSORBER OF Cu2+., Pb2+., Ni2+ AND Cd2+ IN AQUEOUS SOLUTION. / Estudo da Utilização de Magnetita como Material Adsorvedor dos Metais Cu2+ , Pb2+ , Ni2+ e Cd2+ , em Solução.
Various references on the use of ferrous compounds as non - conventional adsorption materials can be found in literature. According to the literature, such materials as hematite, galvanic slag and blast furnace slag were successfully used in liquid waste treatment for heavy metals removal. Thus, the use of abundant ferrous metallurgy slag may prove to be eff
Publicado em: 2000
-
22. The heat shock response in HeLa cells is accompanied by elevated expression of the c-fos proto-oncogene.
Several known inducers of the heat shock response (heat stress, arsenite, and heavy metals) were shown to cause a significant elevation of c-fos mRNA in HeLa cells. Heat stress resulted in a time- and temperature-dependent prolonged elevation in the level of c-fos mRNA, which was accompanied by increased translation of c-fos protein and its appearance in the
-
23. Selective activation of human heat shock gene transcription by nitrosourea antitumor drugs mediated by isocyanate-induced damage and activation of heat shock transcription factor.
Treatment of cultured human tumor cells with the chloroethylnitrosourea antitumor drug 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) selectively induces transcription and protein synthesis of a subset of the human heat shock or stress-induced genes (HSP90 and HSP70) with little effect on other stress genes or on expression of the c-fos, c-myc, or beta-actin ge
-
24. Role of heat shock transcription factor in yeast metallothionein gene expression.
The induction of Saccharomyces cerevisiae metallothionein gene transcription by Cu and Ag is mediated by the ACE1 transcription factor. In an effort to detect additional stimuli and factors that regulate metallothionein gene transcription, we isolated a Cu-resistant suppressor mutant of an ACE1 deletion strain. Even in the absence of metals, the suppressor m