Conference Proceedings

Investigation Of Argon Protection Behavior In Ingot Casting Process

Published: 2014
Authors: ZHOU Tongjun

This paper describes the development of argon protection in the ingot casting process, and the production process of totally enclosed argon protection in a 40-tons production line. The influences of some related factors on the oxygen content are analyzed.

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Inhibition Effect Of Phenylamine On The Corrosion Of Austenitic Stainless Steel (Type 304) In Dilute Sulphuric Acid

Published: 2014
Authors: R.T. Loto, C. A. Loto and A.P.I. Popoola

The corrosion of austenitic stainless steel (type 304) in dilute sulphuric acid solutions in addition to recrystalized sodium chloride concentrates in the presence of specific proportions of phenylamine was studied with the aid of polarization resistance technique, electrode potential monitoring and coupon method. Results showed the overwhelming influence of the compound in corrosion inhibition with an inhibition efficiency of 97.5% from coupon analysis and 86.10% from polarization test at highest observed concentration of the inhibitor.

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Effect Of Cobalt Content On Fatigue Lifetimes And Short Fatigue Crack Growth Behavior Of Tungsten-Cobalt Cemented Carbides

Published: 2014
Authors: Hiroko Mikado, Sotomi Ishihara, Noriyasu Oguma, Kenichi Masuda, Shingo Kawamura

Fatigue lifetimes and crack growth behavior of the cemented carbides with different Co content were investigated. Effect of the Co content on the fatigue lifetimes is found to be minimal within the Co content, 13 -18 wt% tested in the present study.

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Efficient Method Of Structural And Electronic Properties Modification Of Amorphous As-S-Se Chalcogenide Films

Published: 2014
Authors: Korobova N., Almasov N., Prikhodko O., Timoshenkov S., Tsendin K.

Chalcogenide glassy semiconductors (CGS) are promising materials for various elements of electronic and optical instrumentation creation. These semiconductors are unique objects of various electronic processes investigation in structurally disordered condensed media [1, 2], Representation of CGS atomic structure is continuously evolving.

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Experimental And Numerical Studies On Multistage Strength Degradation In Notched Concrete Beams Under Repeated Loads: A Review

Published: 2014
Authors: Masaaki Nakano, Zihai Shi, Yukari Nakamura, Cuiping Liu, Hiroshi Tanaka

The multistage strength degradation theory states that fatigue is caused by the sporadic sudden change o f c racking behaviour in a system under cyclic loading, leading to intermittent strength reduction of the system and its eventual failure. To prove this theory, an experimental study on the load-carrying capacity of notched concrete beams was carried out first, in which the sizes of several notches were enlarged sequentially to simulate the growth of cracks under repeated loading

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Co2 Corrosion Of Steels For The Oil & Gas Production And Transportation

Published: 2014
Authors: A. Herrera, A. Forero, R. P. Silva, S. Bott

In the pre-salt fields, in Brazil, oil recovery has been increased by re-injecting carbon dioxide extracted from the wells. Deeper oil/gas reservoirs contain large quantities of CO2 and, therefore, CO2 corrosion is an up to date issue and as such newer attempts are been made to study the mechanisms of the C02 corrosion.

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Monitoring Technology For Integrity Management Of The Hull Structure Of Floating Production, Storage And Offloading (Fpso) Vessel

Published: 2014
Authors: Shan Guan; Graeme Ripley

The FPSO vessel is prone to corrosion and corrosion-induced structural degradation because of the saline marine environment and continuous loading/offloading operation. To assure the structural integrity and safe operation, they must be inspected periodically, and ideally continuously monitored. 16 types of sensing technologies were identified for monitoring of FPSO Vessel.

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Boride Particle Detection In Al Melts Via Laser-Induced Breakdown Spectroscopy

Published: 2014
Authors: S.W. Hudson, D. Apelian

Aluminum alloy castings are becoming commonplace for critical applications in the automotive and aerospace industries where materials failure is not an option. In order to meet such property demands, tight control over the cleanliness of the melt (mitigation of solid particle inclusions) and microstructure must be achieved. In order to control cleanliness, it must first be well defined and measured.

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New Simple Approaches For Designing Eco-Friendly Smart And Functional Coatings For Industrial Applications

Published: 2014
Authors: Abdel Salam Hamdy Makhlouf

A new class of 'smart' or 'self-healing' advanced coatings of multifunctional properties has been developed during the last decade. Such properties add functionality to the materials of construction to protect themselves automatically after mechanical, physical or chemical damages. However, most of the smart coatings techniques available are quite expensive and need further investigation for possible use in real industrial applications.

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Control Of Internal Cracks In The Ingots Of Fe-Cr-Al Alloy Produced By Electroslag Remelting Process

Published: 2014
Authors: Weihua Zhang, Shufeng YangR, Jingshe Li, Xiangzhou Gao

The reasons caused internal cracks in the 200 kg Fe-Cr-Al alloy ingot produced by electroslag remelting (ESR) process were analyzed by industrial experiments and the effects of mold structure, cooling method and intensity, and heating voltage and current were included.

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