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Content available remote Computer simulation of hardness and microstructure of casted steel 100Cr6
Smoljan B., Iljkić D., Maretić M.
Archives of Materials Science and Engineering
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2016
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Vol. 78, nr 1
23--28
EN
Purpose: The research purpose is to upgrade the mathematical modelling and computer simulation of casting of steel. Design/methodology/approach: Based on theoretical analyses of physical processes which exist in casting systems the proper mathematical model is established and computer software is developed. Findings: On the basis of control volume method, the algorithm for prediction of mechanical properties and microstructure distribution in steel casting has been developed. Research limitations/implications: The computer simulation of casting of steel is consisted of two parts: numerical calculation of transient temperature field in process of solidification and cooling of casting to the final temperature, and of numerical calculation of mechanical properties. Practical implications: The hardness and microstructures of casting has been predicted based on CCT diagrams. Physical properties that were included in the model, such as heat conductivity coefficient, heat capacity and surface heat transfer coefficient were obtained by the inversion method. Originality/value: The algorithm is completed to solve 3-D situation problems such as the casting of complex cylinders, cones, spheres, etc. The established model of steel casting can be successfully applied in the practice of casting
2
Content available remote Adhesivity of electroless Ni-P layer on austenitic stainless steel
Smoljan B., Iljkić D., Maretić M.
Archives of Materials Science and Engineering
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2016
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Vol. 80, nr 2
53--58
EN
Purpose: Optimization of testing of adhesivity of electroless deposited nickel-phosphorous coatings on austenitic stainless steel substrate. Design/methodology/approach: The main study has been focused on comparison of testing methods of adhesivity of electroless nickel-phosphorous coatings and analyses of influence of heat treatment on adhesivity of electroless nickel-phosphorous. Findings: It was found out that adhesivity of electroless nickel-phosphorous coatings can be successfully characterized by Vickers hardness tester. Research limitations/implications: The study was not extended to other types of deposited layers in order to be able to bring a general decision about applicability of this method in the testing of adhesivity of deposited layers. Practical implications: Based on experimental results it was found out that heat treated nickel-phosphorous coating have higher microhardness than non-heat treated electroless nickel-phosphorous coatings. High microhardness of heat treated nickel-phosphorous coating is connected with formation of Ni3P phase. Moreover, better adhesivity can be achieved by application of proper activation process before electroless coating. Originality/value: Standard Vickers hardness method was successfully applied in testing of adhesivity of electroless nickel-phosphorous coatings on austenitic stainless steel substrate.
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