Aisi 4340 Steel
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Aplicação da técnica de CAMQL na retificação cilíndrica externa do aço AISI 4340 utilizando rebolo de CBN
RESUMO O processo de retificação possui como características o bom acabamento superficial e alta precisão dimensional e geométrica. Assim, peças usinadas por este processo possuem um alto valor agregado por se tratar de um processo de acabamento que é comumente realizado nas últimas etapas da fabricação. Um fator limitador do processo de retificaç
Matéria (Rio J.). Publicado em: 16/09/2019
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2. Analysis of Quenching Parameters in AISI 4340 Steel by Using Design of Experiments
This paper aims to investigate the effects of quenching parameters (temperature and time of austenitizing and cooling rate) on the microstructure, hardness and distortion of AISI 4340 steel by Design of Experiments (DoE). The factorial design was used to determine the influence of the factors on the response variable. After quench samples were characterized
Mat. Res.. Publicado em: 14/11/2018
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3. Numerical stress-life curves for the AISI 4340 steel using two sets of materials properties and different bi-axial stress ratios
Abstract Fatigue assessments by the more robust strain-based approach demand the determination of the local strain history from nominal stresses. For notched members, a cyclic constitutive relation, the stress concentration factor (SCF) and a strain concentration rule are used with this aim in some approximate solutions. The plastic part of the cyclic consti
Lat. Am. j. solids struct.. Publicado em: 29/10/2018
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4. Evaluation of the oil flow using the MQL technique applied in the cylindrical plunge grinding of AISI 4340 steel with cbn grinding wheel
Abstract The grinding process is defined as an abrasive cutting action of a tool known as grinding wheel, which is submitted to high rotations, promoting excellent finishing and accuracy in dimensions, respecting the parameters established in each project. During the machining, the cutting edges of the abrasive grains undergo wearing and this increases the c
REM, Int. Eng. J.. Publicado em: 2018-07
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5. Influence of water in the MQL technique in the grinding of steel AISI 4340 using CBN wheels
Abstract Usually, machining employs cooling methods to avoid high temperatures. In most cases, the cutting fluid is applied with high flow and low pressures. This technique consumes a large amount of cutting fluid that causes serious problems in the environment and in the health of the worker. An alternative to the conventional cooling method is the Minimum
REM, Int. Eng. J.. Publicado em: 2018-07
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6. Surface Integrity Characterization of Hardened AISI 4340 Steel in Grinding Process with Biodegradable Formulations of Cutting Fluids
Surface integrity has significant effect on service performance of a component. The surface integrity of workpieces submitted to grinding process depends on the conditions of cooling produced by cutting fluids, which are used to avoid microstructural damage in the process. However, cutting fluids are harmful to the environment and human health, and appear as
Mat. Res.. Publicado em: 20/02/2017
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7. Effect of Continuous and Pulsed Current on the Metallurgical and Mechanical Properties of Gas Tungsten Arc Welded AISI 4340 Aeronautical and AISI 304 L Austenitic Stainless Steel Dissimilar Joints
In this research work, the weldability of low alloyed AISI 4340 aeronautical steel and AISI 304L austenitic stainless steel joined by continuous current (CC) and pulsed current (PC) gas tungsten arc welding (GTAW) techniques, using ER309L and ERNiCr-3 filler metals was investigated. The main focus of the study involves the investigation on the effect of cont
Mat. Res.. Publicado em: 2015-02
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8. 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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9. Estudo teórico da condução de calor e desenvolvimento de um sistema para a avaliação de fluidos de corte em usinagem / Theoretical study of heat conduction and development of a system for evaluation of cutting fluids in machining
Due to the rapid growth and development of machining processes there has been a demand for environmental sustainability and news cutting fluids have been applied. A reliable assessment of their efficiency in cooling the workpiece, tools and improving productivity is still a requirement. The present thesis presents a theoretical study and a proposal of a syst
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2011
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10. Behavior of surface integrity in cylindrical plunge grinding using different cooling systems
The superficial texture of the material can exert a decisive influence on the application and performance of the machined component. The conventional fluids used in grinding processes are environmental risk and can also be dangerous to the health. The disposal of these toxic fluids is expensive and the contamination in the proximities of the machines can pre
Materials Research. Publicado em: 15/04/2011
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11. Wear evaluation of WC inserts coated with TiN/TiAlN multinanolayers
TiN/TiAlN multilayers were deposited by radio frequency, r.f., reactive magnetron sputtering by using titanium and aluminum targets with 10 cm diameter and 99.99% purity in an argon/nitrogen atmosphere, applying a substrate temperature of 300 ºC. WC inserts were used as substrates to improve the mechanical and tribological properties of TiN/TiAlN multilayer
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-06
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12. Adsorção, absorção, dessorção e difusão de hidrogênio nascente no aço AISI 4340 / Adsorption, absorption, desorption and diffusion of nascent hydrogen on AISI 4340 steel
A fragilização de aços por Hidrogênio é um problema ainda não resolvido nas indústrias petrolíferas e petroquímicas. O Hidrogênio proveniente de reações químicas e eletroquímicas, tais como, corrosão, proteção catódica e reações de processo, é absorvido pelo aço e retido nos defeitos da rede cristalina podendo causar a fragilização do
Publicado em: 2010