Keyword: nodular iron

  • INVESSTIGATION OF MICROSTRUCTURAL AND MECHANICAL PROPERTIES OF DIFFERENT TYPE OF CASTINGS

    Materials Science. Non-Equilibrium Phase Transformations., Vol. 3 (2017), Issue 2, pg(s) 60-64

    In this research work are presented results and procedure for investigations different types of castings in order to check their properties according to appropriate standards, to identify type of unknown casting, to detect and analyze different type of defects in castings and to perform failure analyze in order to determine the reasons for fracture. Presented investigations are basic research activities which are performed almost in all research laboratories for investigations of castings.

    They mainly consist of identification of visual inspection, investigation of chemical composition, investigation of mechanical properties and microstructural identification. Completing of the results from performed investigations and their analysis required information about investigated casting can be obtained.

    In this research work are given result of investigations of three castings GJS- 450-10 cast iron, malleable cast iron and Hadfield steel casting.

  • METALLOGRAPHIC ANALYZE OF PARTS FOR BREAKING SYSTEM MADE OF NODULAR CAST IRON EN-GJS-500-7

    Materials Science. Non-Equilibrium Phase Transformations., Vol. 2 (2016), Issue 2, pg(s) 10-12

    In this research work, metallographic investigation of two parts which are implemented to railway wagons breaking system was performed. Both parts are produced from EN-GJS-500-7 nodular iron. One of delivered parts leading nut (part 1) was broken during the exploitation and the second part working nut (part 2) was new. Metallographic investigation based on standard EN 945-1was implemented in order to check the quality of the parts. The reason for breaking of part 1 one was analyzed too. After metallographic preparation, the polished specimens they were analyzed under optical microscope in order to determine form, size, density and distribution of graphite per unite area as first graphite nodules were analyzed after that microstructure of nodular iron. Figures from optical microscope were compared with reference images under the same magnification. After etching the specimens their microstructure was analyzed. It was concluded that quality of the part 2 is much better concerning the requirement of the EN 945 -1 standard.