Dorin BORDEAȘU

26-55 MODIFICAREA REZISTENȚEI LA CAVITAȚIE A BRONZULUI AMPCO 45 PRIN DIVERSE TRATAMENTE DE DURIFICARE

Această intrare a fost publicată în 2014 Revista Volumul 26 și etichetată Constantin BORDEAŞU Dorin BORDEAȘU Ilare BORDEAŞU Rodica BĂDĂRĂU la de

CHANGE THE BRONZE AMPCO 45 RESISTANCE TO CAVITATION BY VARIOUS HARDENING TREATMENTS
This paper presents of the micro hardness effect of the Bronze AMPCO 45 upon resistance to cavitation of erosion, generated to T2 device vibrating piezoelectric crystal, by the Cavitation Laboratory of the Polytechnic University of Timisoara. The micro hardness changing of the exposed surface to the cavitation, by volume heat treatment, laser reminting with three powers in pulse, and by thermal spray, followed by laser reminting, with two powers different in impulse. Research shows that resistance to cavitation erosion tends to grow exponentially with hardness. The greatest strength, namely the average penetration depth of erosion is recorded for the area covered with ceramic powders remitted with laser
Keywords: erosion by the cavitation, the cavitation, the average penetration depth of erosion, the hardness

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24-61 COMPORTAREA ȘI REZISTENȚA LA CAVITAȚIE A DOUĂ OȚELURI INOXIDABILE CU STRUCTURI BIFAZICE DE AUSTENITĂ ȘI MARTENSITĂ

Această intrare a fost publicată în 2013 Volumul 24 și etichetată Dorin BORDEAȘU Ilare BORDEAŞU Rodica BĂDĂRĂU Constantin BORDEAȘU la de

THE INFLUENCE OF THE TYPE AND FONCTIONAL
PARAMETERS OF THE VIBRATOR APPARAT UPON THE
EVOLUTION CAVITATION EROSION
This paper analyses the behaviour and resistance to cavitation for two
stainless steels with biphasic structures of austenite and martensite, in different
proportions.
The two steels have the similar content of nickel, but different
chromium and carbon. Degradation of the investigated surface is accomplished
by vibratory cavitation, produced in the piezoceramic crystal device T2, located
in Cavitation Laboratory, University Polytechnic Timisoara.
The research results are presented in the form of penetration speeds
erosion, the experimental points and the approximation analytical curves, as
well as the photos for the profile breakings, in a given section The conclusions
show that the steel, with higher carbon content and lower of the chrome, has a
superior strength and the behaviour of the lower carbon content and higher
chromium, although, the latter has a higher proportion of the martensite,
constituent considered with the highest resistance to cavitation.
Cuvinte cheie: eroziunea de cavitaţie, oţel inoxidabil, microstructură,
compoziţie chimică
Keywords: erosion of the cavitation, stainless steel, microstructure,
chemical composition

61 COMPORTAREA ȘI REZISTENȚA LA CAVITAȚIE A DOUĂ OȚELURI INOXIDABILE CU STRUCTURI BIFAZICE DE AUSTENITĂ ȘI MARTENSITĂ