Wyniki wyszukiwania - BazTech

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Effect of heat treatment on the microstructure and mechanical properties of a low-carbon X80 pipeline steel

Acosta-Cinciri B. C., López-Granados N. M., Ramos-Banderas J. A., Hernández-Bocanegra C. A., Garnica-González P., López-Corpus J. A.

Materials Science Poland

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2021

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Vol. 39, No. 1

103--112

EN

In this work, the effect of heat treatment conditions on the microstructure and mechanical properties of an American Petroleum Institute (API) X80 steel with a low carbon content of ~0.02% wt., destined for the manufacture of pipelines and pipeline transmission systems by welding, was investigated. Samples were heat treated under different conditions and then were characterized by scanning electron microscopy (SEM), orientation image microscopy (OIM), and electron backscattered diffraction (EBSD). The results showed that when the steel is fastly cooled from the austenitic field (990°C), the mechanical properties increase significantly [ultimate tensile strength (UTS) >1,100 MPa, yield strength (YS) 900 MPa, and elongation 27%] due to the high percentage of martensite (M) present in the microstructure (95%). In contrast, when the cooling rate decreases and the treatment conditions remain at/or above the bainitic/martensitic transformation (from 990°C to 600°C and 450°C), the mechanical properties are decreased by almost 50% because of the decrease in the percentage of martensite (18%). However, the percentage of elongation increases significantly (38%) due to the presence of other micro-constituents resulting from the phase transformation. On the other hand, the best combination of mechanical properties (UTS above 800 MPa and YS between 610 MPa and 720 MPa) was obtained when the steel acquired a dual-phase microstructure [(martensite/austenite)-(ferrite/martensite)] since the amount of martensite is conserved between 45% and 82%, in combination with the other micro-constituent present in the steel that allows us to achieve elongation percentages close to 30%.

2

Frequency Dependent Mismatch Correction Scheme for Zero-IF Receivers

Hibner R., Zieliński R. J.

International Journal of Electronics and Telecommunications

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2018

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Vol. 64, No. 1

13--18

EN

This paper shows effective method of linear distortions compensation in zero-IF receivers. With application of frequency domain processing a computation efficient method was developed that allows to correct quadrature mismatch in Zero-IF receiver along with gain and group delay independent of receiving signal type. Method was implemented and tested on hardware platform confirming its effectiveness. This method makes it possible to build high sensitivity devices to monitor spectrum in very wide frequency ranges.

3

AI and IQ- the comparison and the measuring methods

Lubieniecka-Kocoń K.

Archives of Transport System Telematics

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2010

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Vol. 3, iss. 4

27-31

EN

The hereby article is to present the notions of two concepts: human and artificial intelligence. The paper first offer the short presentation of their most common definitions. Both terms are widely known, however, not often are they viewed from the same perspective. Thus, the most intriguing part is to treat both issues in the similar, if not the same, way, using close assessment tools. Furthermore, the ways, methods and the approaches towards the assessment tools are provided. Finally, the comparison between those two concepts is shown, together with the idea of ITS as an example of AI.

4

Inteligentne Strategie Przedsiębiorczości

Swarcewicz R.

Logistyka

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1998

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nr 2

23-24