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Authors: Lindsey Goodman and Eric Caldwell
As oil and gas extraction moves deeper and farther offshore, many technical challenges arise. Deeper wells are often produced with flowing wellhead temperatures in excess of 300°F (150°C), and equipment is subject to hydrostatic conditions nearing 5,000 psi (345 bar) hydrostatic pressure. Despite high temperatures of produced fluids, it is often necessary to insulate subsea production equipment and flow-lines to prevent blockages such as hydrates and waxes that can form during shutdowns.
Authors: Xiangzhou Gao, Jingshe Li, Shufeng Yang
In order to improve the center segregation of 50CrMo billet, a three-dimensional numerical model for continuous casting process was established to investigate the influence law of process parameters on secondary dendrite arm spacing (SDAS) and equiaxed crystal ratio.
Authors: P. Karandikar, E. Klier, M. Watkins, Brandon McWilliams, and M. Aghajanian
Metal matrix composites (MMCs) combine the desirable characteristics of metals (ductility, thermal conductivity) and ceramics (high hardness, high stiffness, low thermal expansion). For many armor (multi-hit capability) and structural applications, ductility is very critical.
Authors: Manabendra Kumar Maity, Avtandil K Bairamov, Eissa Al-Zahrani
A package boiler of a utility plant in a petrochemical plant experienced premature corrosion and leakage in the water wall tubes resulting in an emergency shutdown.
Authors: J. Toribio, D. Vergara and M. Lorenzo
A hydrogen diffusion simulation through the wall of a nuclear reactor pressure vessel of the type WWER-440 is shown in this paper, using a numerical model of hydrogen diffusion assisted by stresses and strains. The nuclear reactor pressure vessel is composed by a bi-material of stainless steel, acting as a cladding material, and low carbon steel, acting as a base material.
Authors: ZHOU Tongjun, L IU Junzhan, LUO Hui
During ingot casting process, the parametric changes of molten steel pouring process often cause both ingot surface and internal quality defects.
A cleavage fracture is produced, usually at low temperature, under a condition of high triaxial stress-that is, at the root of the notch-or at a high deformation rate, as for example by impact loading.
Authors: Pavel Suchmann, Petr Martinek
Chemical composition of steels used for heavy-duty parts of car gearboxes is usually defined by technical standards, in which certain deviations from nominal composition are allowed. However practical experience shows that in many cases even such small deviations can significantly influence the steel's behaviour during hardening.
Effects Of Trace Elements On Microstructure And Thermal Properties Of Al-Zn-Cu Based Alloys Using Extrusion
Authors: Yong-Ho Kim, Jung-Han Kim, Hyo-Sang Yoo, Jung-Won Choi and Hyeon-Taek Son
Thermal properties and microstructure of Al-4Zn-2Cu-x(x=2wt%Mg, 2wt%Sn, 0.7wt%Mg- 0.7wt%Sn-0.7wt%Ca) alloys on cast and extrusion have been investigated with extrusion temperature of 400 °C. Al-4Zn-2Cu alloy was composed of Al and Al2Cu phases. By adding Mg contents, Al2Mg3Zn3 phase was increased and Al2Cu phase was decreased respectively.
Authors: M. Chakraborty
There has been a considerable interest in the ternary Al-Ti-B system amongst the aluminium casting fraternity.