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Authors: Elias Jelis, Stacey Kerwien, Nuggehalli M. Ravindra and Matthew Clemente
Direct Metal Laser Sintering (DMLS) is an emerging additive manufacturing process with the capability to manufacture small parts with complex geometries which otherwise cannot be produced by subtractive manufacturing techniques. Most components produced by DMLS are fully dense and have mechanical properties that are comparable to wrought material
Hydrogen Embrittlement Of Cold Drawn Prestressing Steel: Influence Of The Straining History During Drawing
Authors: J. Toribio, M. Lorenzo and D. Vergara
Residual stresses and plastic strains generated in cold drawn wires during the conforming process affect fracture performacne and structural integrity of these components in both air and aggressive environments.
Authors: PEI Xinhua, Tang Shuai
In this paper, the physical metallurgy behavior of Ti containing high strength steel sheet under intensive cooling process after hot-rolling was studied. The results show that the intensive cooling broaden the bainite transformation field. The phase transformation incubation period are shorten and the CCT curve moves to bottom left.
Authors: SZ Qamar, T Pervez
Though a relatively new development, swelling elastomers are now widely used in various difficult situations in the oil and gas industry such as water shutoff and other types of zonal isolation. Swell packers were initially used for repair of old and damaged wells, but they are now increasingly used for higher productivity and profitability through developments like slim well design and cementless completions.
Authors: Dr. Nikolai I. Kobasko
In the paper superstrengthening phenomenon is discussed which is based on self- regulated thermal process taking place during transient nucleate boiling mode. Superstrengthening means additional strengthening of a material when cooling rate within the martensite range is high enough and compressive stresses are formed at the surface of steel parts. The main attention is paid to self - regulated thermal process because it allows metallurgists to optimize superstrengthening phenomenon by maximizing density of dislocations in material and making optimal condition for precipitation of fine carbides in steels and irons.
Authors: Ahmed A. Al-Joubori and C. Suryanarayana
We present here our results on the synthesis of iron-carbon alloys (steel and cementite) starting from blended elemental iron and carbon powders. The powder particle size decreased and the lattice strain increased with increasing milling time, as determined from the width of the X-ray diffraction peaks and also confirmed by scanning electron microscopy.
Authors: Raghavan Srinivasan, M. Ashraf Imam
Aluminum alloys contain dispersoids, namely thermodynamically stable second phase particles ranging in size from 0.1 to 1.0 um, which are used, for example, to control grain size. The presence of second phase particles could have a beneficial or detrimental effect on fatigue behavior depending on their properties and distribution with in the aluminum matrix. Hard non-shearable particles promote cross-slip and deformation homogenization that delays fatigue crack initiation, while shearable particles result in planar slip, which promote strain reversal and crack closure and slows crack propagation.
Authors: Carlo Dellabiancia, Lorenzo Rolla, Cristian Schiffini
In this paper are schematically shown some typical failures found in naval field. Such failures involved several materials which are used in different types of boats, ships and or equipment.
Authors: Kenichi Masuda, Sotomi Ishihara, Yuki Tochikawa, Arthur J. McEvily, Masaki Okane, Seiichi Nishino
In this study, fatigue tests were conducted on aluminum alloy 7075-T6 to study fatigue crack growth and crack closure behavior of the material. The experiments included the determination of the crack-opening levels Kop as a function of AK, the rate of fatigue crack growth da/dN as a function of AKeff, where AKef (= Kmax-Kop) is the effective stress intensity factor range.
Authors: R. Ebara , M. Endo , H.J. Kim , J. Nakahigashi
This paper reviews fatigue strength, fatigue crack initiation and fatigue crack propagation behavior of protium treated ultra-fine grained Ti-6Al-4V alloy in air and in 3% NaCl aqueous solution. First the protium treatment procedure for Ti-6Al-4V alloy and characteristics of ultra- fine grained Ti-6Al-4V alloy such as microstructure and mechanical properties is briefly summarized.