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Convective flow during arc welding processes mainly depends on electromagnetic force, Marangoni force, and buoyancy force. The Marangoni flow (caused by surface tension gradient,dγ/dT)and the buoyancy driven flow are the major factors in controlling weld penetration in austenitic stainless...
Isochronal annealing of cold worked commercial pure aluminum (99.5%) and Al-1wt% Mn alloys was demonstrated between room temperature and 823 K. The stages of recovery and recrystallization were studied using microhardness and positron annihilation lifetime measurements. Apositive correlation was...
Microstructures of 25Cr35Ni heat-resistant cracking tube after service were investigated and degradation mechanism of tube material was discussed. Results reveal that three distinguished zones, that is, internal oxide, carbide free, and internally carburized zones, will gradually develop in the...
Observations were made during tensile testing of some zinc-base alloys (37.5% Al) comprised of nickel/silicon at different strain rates and temperatures. The zinc-base alloy without nickel/silicon was also tested under identical conditions to see the effects of the alloying elements on the...
A relationship is established between the heat transfer coefficient on the external surface of a mold and the ambient temperature and pressure within the operating range typical of pressure-infiltration casting of metal-matrix composites. This relationship is based on existing data and...
Aluminum-lithium alloys have shown promise for aerospace applications, and National Aeronautics and Space Administration (NASA) has selected the aluminum-lithium Alloy 2195 for the main structural alloy of the super light weight tank (SLWT) for the space shuttle. This alloy has significantly...
This work employs the PVD process to deposit coatings of single layer TiN, binary layer TiN/TiCN, multilayer TiN⇔⇔N, and sequenced TiN⇔CN⇔N multilayer coatings with variable individual TiN-layer and TiCN-layer thicknesses on tungsten carbide disks and inserts.
Surface nitriding of commercially pure (CP) titanium was carried out using high power CO
laser at pure nitrogen and dilute nitrogen (N
+ Ar) environment. The hardness, microstructure, and melt pool configuration of the laser melted titanium in helium and argon atmosphere was compared...
Important uses in the future for metal-matrix composites are in aerospace, weaponry, and high-speed power plants in which the inertial force produced by great acceleration is a load of high strain rate. Therefore close attention is given to the mechanical behavior of a composite at high strain...
Electrolytic nickel powder and water-atomized Fe36Ni alloy powder were consolidated into combined compacts with the “two-layer pressing” technique. The compacts, 1.6 mm thick, were sintered at 1200 and 1300‡C in hydrogen, and then rolled into strips 0.8 mm thick. The rolled and annealed strips...
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