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Strategie obróbki cieplnej dla zimnowalcowanych i gorącowalcowanych taśm z karoseryjnych stali średniomanganowych

Morawiec Mateusz, Grajcar Adam, Skowronek Adam, Kozłowska Aleksandra

Hutnik, Wiadomości Hutnicze

2019

Vol. 86, nr 8

267--271

Przedstawiono strategie obróbki cieplnej dla karoseryjnych taśm ze stali średniomanganowych. Celem części badawczej było zbadanie wpływu temperatury wyżarzania międzykrytycznego z zakresu 680-800°C przez 1h na stabilizację austenitu szczątkowego w stali średniomanganowej. Materiałem wykorzystanym w eksperymencie była stal zawierająca 0,16% C, 4,7% Mn, 1,6% Al, 0,2% Mo, 0,2% Si. Zakres pracy obejmował badania dylatometryczne, twardości oraz obrazowanie na mikroskopie świetlnym i skaningowym. Wyżarzanie międzykrytyczne przeprowadzone w temperaturze 700 oraz 680°C umożliwiło wytworzenie w strukturze stabilnego austenitu szczątkowego.

Heat treatment strategies for autobody medium-manganese steel sheets were presented. The aim of the research work was to investigate an effect of intercritical annealing temperature in a range of 680-800°C for 1h on the stabilization of retained austenite in a medium manganese steel. The material used in the experiment was a steel containing 0.16% C, 4.7% Mn, 1.6% Al, 0.2% Mo, 0.2% Si. The scope of the research included dilatometer tests, hardness tests and imaging using light and scanning electron microscopes. Intercritical annealing carried out at 700 and 680°C allowed forming some stable retained austenite in the structure.

The concept of preparation of oesophageal prosthesis based on long-fibre composite materiał

Dobrzański L.A., Nowak A. J., Błażejewski W., Rybczyński R.

Journal of Achievements in Materials and Manufacturing Engineering

2011

Vol. 46, nr 1

18--24

Purpose: In the work, there was investigated the possibility of an application of long-fibrous composite material as a based material for prototype of oesophageal prosthesis (tubular element) with the use of so called arms, using coiling, plaiting and winding techniques. Design/methodology/approach: Coiling, plaiting and winding techniques were used. As a reinforcement, aramid fibres bound with different types of so called silicone rubbers. Selection of winding parameters has been made in order to fabrication of prosthesis with appropriate mechanical parameters. Findings: Technological tests have given promising results. In the summary, comments and technological remarks are described. For prototype of prosthesis manufacturing, components, which in the form of composite materials are characterized by biocompatibility, have been used, that is medical silicone and aramid fibres. Research limitations/implications: The pilot investigation of fabricated prototypes of internal oesophageal prosthesis show that it is necessary to change the fabrication technology onto dry winding followed by closing obtained reinforcement in a mould and saturation with silicone. The idea is to get better silicone content and connected with it better elasticity and tightness of the prosthesis. Originality/value: Accepted method of winding is the most effective due to fabrication of prototypes of internal oesophageal prosthesis in laboratory. In industry, probably the better method will be plaiting, e.g.: as in the case of high-pressure hose of applied hydraulics.