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FEM simulation of Ductility Minimum Temperature (DMT) phenomenon in CuNi25 alloy

Sakiewicz P., Nowosielski R., Babilas R., Gąsiorek D., Pawlak M.

Journal of Achievements in Materials and Manufacturing Engineering

2013

Vol. 61, nr 2

274--280

Purpose: The aim of this paper was to check by three dimensional Finite Element Method simulations the possibility of existence the non-uniform deformation hypothesis as a cause of Ductility Minimum Temperature phenomenon (DMT) in CuNi25 alloy. The necessary information and mechanical properties have been collected during elevated temperature tensile tests and other research and analysis of microstructure changes in material after deformation at the range of DMT existence. Experimental results were compared with three dimensional finite element method (FEM) simulation. Design/methodology/approach: Numerous techniques were used to characterize properties of material: high temperature tensile tests, finite element method, transmission electron microscopy, scanning electron microscopy. Findings: During the experimental studies the course of elongation curves has been determined. The stress in material after deformation at elevated temperature was analysed by FEM simulation. It has been confirmed the possibility of existence the inhomogeneous deformation hypothesis as a cause of DMT phenomenon. Practical implications: Understanding of material properties during high temperature deformation leads to selection of the appropriate production parameters and reductions of cost, helps to avoid destruction of material during production or operating. FEM simulations can help to reduce the costs of multiple destructive tests to determine material properties. Originality/value: FEM simulation and investigations of this CuNi25 alloy complete knowledge about mechanical properties of this material and help us develop correct parameters for more effective technologies for material production and exploitation.

Changes of microstructure in CuNi25 alloy deformed at elevated temperature

Sakiewicz P., Nowosielski R., Griner S., Babilas R.

Archives of Materials Science and Engineering

2011

Vol. 50, nr 2

98-109

Purpose: The aim of this paper was to present behaviour of CuNi25 alloy during elevated temperature tensile tests and describe changes of microstructure of material after deformation at the range of the Ductility Reduced Area (DRA) in which the phenomenon of Ductility Minimum Temperature (DMT) is situated. Design/methodology/approach: Numerous techniques were used to characterize properties of material: high temperature tensile tests, transmission electron microscopy (TEM), HRTEM, FFT. Findings: During the experimental studies the course of elongation and reduction of area curves has been determined. Morphology of material after deformation at elevated temperature was analysed. Research limitations/implications: Further studies should be undertaken in order to correlate effects, processes and mechanism existing and superimpose in material in range of Ductility Minimum Temperature phenomenon, it should help us understand high temperature properties of mentioned material. Practical implications: Knowledge about material properties during high temperature deformation leads to selection of the appropriate production parameters. Misapplication of parameters leads to multiplication of costs and often destruction of material during production or operating. Correct selection of technical and economical parameters of material production processes gives us supremacy in economic and technological competition. Originality/value: Investigations of this CuNi25 alloy complete knowledge about mechanical properties and help us develop correct parameters for more effective technologies for material production.