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“Interactive Power Devices for Efficiency in Automotive with Increased Reliability and Safety” – the European Project Concerning the Main Automotive and Transport Application Domains

Kadlec J., Kuchta R., Novotny R., Hajduga A., Sekrecki M., Roszczyk P., Dybowski J., Kalbarczyk J., Zieliński W., Bańbura P., Burliński R.

Archiwum Motoryzacji

2015

Vol. 69, no. 3

31--64

The overall objective of the IDEAS project is to develop advanced packaging for power supply components and new generation memory systems applicable to Electric and ICE propelled vehicles, with paying attention to considering also the aspects that have not been addressed yet in the running ENIAC and ARTEMIS Automotive projects. A major challenge related to electronic devices in the automotive applications is the reliability of power supply systems which must be capable to assure the functionality of subsystems in all operating conditions, inclusive of ageing. The control systems, which rely on multicore microcontrollers and complex software architectures, require increasingly stringent constraints from the memory devices which need to be designed for very high bandwidth, speed and reliability. In the following thesis, a few aspects of the IDEAS project will be presented: a review of important factors that affect the reliability and life-cycle endurance of NAND flash memories, multispeed gear application in electric drives and its influence on the energy efficiency. The problem of electromagnetic compatibility of electronic devices will also be dealt with in the paper

Background of branched crack formation in surface zone of continuously-cast Ti-Nb microalloyed steel slab

Bekeč P., Longauerová M., Vojtko M., Milkovič O., Kadlec J., Tréfa G., Grimplini G.

Journal of Achievements in Materials and Manufacturing Engineering

2014

Vol. 67, nr 2

58--64

Purpose: This work deals with the study of the background to the formation of branched cracks in a continuously-cast slab, at pulling rate 0.43 m.min-1. Design/methodology/approach: Samples were taken from the individual cut-outs for further analyzes. Macroscopic analysis was used to evaluate the surface quality of the analysed slabs using a Leica Wild M3Z macroscope. The microstructure was observed with an OLYMPUS VANOX-T light microscope. For the evaluation of the concentration profile of the selected elements in planes parallel to the slab surface, wavelength dispersive X-ray analysis (WDX) was used with a Camebax-MICROanalyzer. Findings: The results of the work show that branched cracks extended to a depth of 10 mm below the slab surface and occurred mostly below oscillation marks. Cracks were mostly present in the edge parts of the slab, where they were also deeper in comparison with locations in the middle of the slab width. Microstructural analysis confirmed heterogeneity of ferrite grain sizes in the slab surface skin. Wavelength-dispersive X-ray analysis of a sample with a branched crack showed chemical heterogeneity of harmful elements, mainly S and As. Research limitations/implications: Precipitation of microalloying elements in connection with the cementite can lead to higher probability of surface crack formation, as also confirmed in this study. Originality/value: of this work is background of branched crack formation in surface zone of continuously-cast Ti-Nb microalloyed steel slab.