Characterization And Classification On Ultrasound Signals Using Dct Transformation

2210 Words Sep 22nd, 2014 9 Pages
Microstructural characterization and classification on ultrasound signals Using DCT transformation in PCA framework
Masoud Vejdannik a, Ali Sadr b a,b School of Electrical Engineering, Iran University of Science & Technology (IUST), Narmak, Tehran 16844, Iran a, b
Nb-bearing nickel-based superalloys, like the Inconel 625 alloy studied here, exhibit an outstanding combination of mechanical properties and resistance to pitting, crevice and intergranular corrosion due to the stiffening effect of chromium, molybdenum and niobium in its nickel matrix. These properties make precipitation hardening treatments unnecessary [--]. The extraordinary resistance against a wide range of organic and mineral acids is due to their excellent anti-corrosive properties, mainly at high temperatures. These alloys are commonly found in the marine, aerospace, chemical and oil and gas industries [--].
The Inconel 625 alloy in particular has greater applicability, especially in highly corrosive environments such as the oil and gas industry, than many other Nickel (Ni) based alloys. Nowadays, this alloy is used widely in the weld overlay of the inner surface of carbon steel pipes and other equipment for the offshore industry. However, further studies of this alloy, such as this paper, are necessary to increase the overall knowledge of its properties.
During welding of an Inconel 625 alloy, there is an…
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