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ADVANCES IN MATERIALS SCIENCE following former ACTA TECHNICA GEDANENSIA in specific field of Materials Science and Engineering Published by Gdańsk Scientific Society under the auspices of Polish Materials Society Volume 5 2005 ISSN 1730-2439 Number 1-3 (6-8) Editor - in - Chief : Andrzej Zieliński Editorial Board: • Advanced Materials J. Łabanowski (Editor) • Environmental Degradation J. Ćwiek • Surface Engineering W. Serbiński Technical Editors: M. Głowacka K. Krzysztofowicz B. Raczkowska G. Wołoszyk International Advisory Panel: R. A. A. M. D. L.A. A. V. K. H. H. E. B. E.J. H. J. J.M. J. A. T. Akid, Great Britain Barbacki, Poland Czyrska-Filemonowicz, Poland Danielewski, Poland Desjardins, France Dobrzański, Poland Dziadoń, Poland Goltsov, Ukraine Haberko, Poland Hanninen, Finland Leda, Poland Łunarska, Poland Major, Poland Mittemeijer, Germany Morawiec, Poland Nowacki, Poland Olive, France Onoro, Spain Pomogailo, Russia Wierzchoń, Poland Editorial Office: Advances in Materials Science, Department of Materials Science and Engineering, Gdańsk University of Technology, 11/12 Narutowicza, 80-952 Gdańsk, Poland. tel. (+48 58) 347 26 98, fax (+48 58) 347 18 15, e-mail: [email protected] Advances in Materials Science publishes scientific and review papers on various aspects of materials science. The preferred topics include: environmental degradation, surface engineering and advanced materials. Both fundamental aspects of materials science and engineering, and application problems can be presented in the published papers. The periodical is open to researchers of all countries, both top experts as well as young scientists. All contributions should be written in English. Papers will be reviewed. AMS is availabe at the website www.pg.gda.pl/mech/kim/ams every 3 months. All papers are printed in hard copy as Volume No 1 – 4 in the end of each year. The supplementary information, as instructions for authors, and full texts of recently printed papers are also available at the website. CONTENTS Page Janusz Ćwiek HYDROGEN DELAYED CRACKING OF HIGH-STRENGTH WELDABLE STEELS................. 5 Jerzy Łabanowski ASSESSMENT OF STRUCTURAL CHANGES AT IN-519 CAST STEEL REFORMER TUBES . 14 Eugeniusz Ranatowski REMARKS ON AN INVERSE MODELLING OF WELDING PROCESSES .................................. 21 Andrzej Zieliński, Waldemar Serbiński RELATION BETWEEN STEEL MICROSTRUCTURE AND ITS PROPERTIES IN INERT AND AGGRESSIVE ENVIRONMENTS ..................................................................................................... 32 Andrzej Drotlew, Bogdan Piekarski, Joanna Tuleja WEAR AND TEAR OF CHARGE-CARRYING ELEMENTS IN CARBURISING FURNACE ..... 41 Jarosław Jakubowicz MORPHOLOGY OF SILICON (111) DURING ELECTROCHEMICAL ETCHING IN NH4F ELECTROLYTES ............................................................................................................................... 49 Jerzy Łabanowski, Krzysztof Krzysztofowicz THE INFLUENCE OF WELDING THERMAL CYCLES ON CORROSION RESISTANCE OF DUPLEX STAINLESS STEEL .................................................................................................. 55 Maciej Ranatowski, Eugeniusz Ranatowski ANALYSIS OF THE FRACTURING PROCESS OF NATURAL COMPOSITE ON EXAMPLE OF THE CORTICAL PART OF BONE .............................................................................................. 63 Maciej Ranatowski, Eugeniusz Ranatowski QUANTITATIVE EVALUATION OF THE FRACTURING PROCESS OF NATURAL COMPOSITE ON EXAMPLE OF THE CORTICAL PART OF BONE ............................................ 69 Małgorzata Suchecka, Andrzej Borisovich, Waldemar Serbiński GREEN’S FUNCTION METHODS FOR MATHEMATICAL MODELING OF UNIDIRECTIONAL DIFFUSION PROCESS IN ISOTHERMAL METALS BONDING PROCESS.................................. 75 Tadeusz Z. Woźniak AUSTENITE DOUBLE DECOMPOSITION INTO BAINITE IN HIGH CARBON STEELS……... 80