We have determined the metallographic cooling rates for 13 IVA irons using the most recent and most accurate metallographic cooling rate model. Group IVA irons have cooling rates that vary from 6600 C/Myr at the low-Ni end of the group to 100 C/Myr at the high-Ni end of the group. This large cooling rate range is totally incompatible with cooling in a mantled core which should have a uniform co...

Metallographic, micro-X-ray spectral and X-ray structural analyses have been carried out. The quenching temperature increase from 900 to 1150 °C leads high abrasive wear resistance in Ni-hard chromium-nickel cast iron. initial hardness decreased before the test 60 35 HRC due fact that phase composition of metal base changes during medium-carbon martensite with secondary cementite retained metas...

The microstructure and tensile failure evolution of AA5754O aluminum alloy CMT joints were investigated in this study. First, the properties observed using a hardness test metallographic test. studied situ CT tests. defects heat-affected zone mainly composed pores with large sphericity. softening was due to decrease effective bearing area increase number defects. There shrinkage sphericity less...

Abstract The high-purity ethylene dichloride (EDC) head tower is an important pressure vessel in the vinyl chloride production process. During manufacturing process, bending test of 2 product specimens broke. In this paper, failure analysis fracture welding plate was carried out, and a systematic analysis, including chemical composition, mechanical properties, microstructure, out. causes welded...

The joining of a 6-mm thickness Al 6061 to AISI 1018 steel has been performed by the combined effects of fusion and solid state welding. The process is derived from friction stir welding (FSW) but with an adjustable offset of the probe location with respect to the butt line. Metallographic studies by optical microscopy, electron probe microscopy, and the utilization of the X-ray diffraction tec...

Abstrac t -With increasing miniaturization in microelectronics the wirebonds used in IC packages are witnessing a thrust towards fine pitch wirebonding. To have a precise control over loop height of the wirebond for fine pitch wirebonding, it is imperative to do mechanical characterization of the wirebond. The present work studies the mechanical properties of gold wire and wirebond using nanoin...

The results of a metallographic study of grey cast iron water pipes are reported. These pipes had been installed between 1885 and 1973 in eight different water systems. Each pipe had been extracted during scheduled maintenance or failure repairs to provide data for a larger study to produce a methodology for determining the residual life of grey cast iron pipes. This metallographic study was co...

The electron microprobe (EMP) is an electron optical instrument in which compositional and topographic information are obtained from regions ~lban in diameter on a specimen. Photographs of compositional and topographic changes in 1-mm 2 to 20-/din 2 areas on various types of specimens can also be obtained which are strikingly similar to optical photomicrographs. This paper discusses the various...

EFFECT OF TREATMENT SOLUTION ON THE MICROSTRUCTURE AND MICROHARDNES TERNARY Ni-Al-Nb ALLOY DOPED WITH TITANIUM. Nickel-based superalloys have been widely used in various applications, which require high strength at temperatures. Most types of these is age-hardenable because they γ’ particles' chemical composition Ni3(Al, Ti) γ’-phase matrix. This research will be alloy added alloying elements T...