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1

A methodology of experimental research on corrosive-erosive wear behaviour of iron alloys in mine water

Kalandyk B., Kalandyk J.

Archives of Metallurgy and Materials

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2010

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Vol. 55, iss. 3

861-867

EN

The paper presents a methodology applied in testing the wear behaviour of selected iron alloys used for the components of pumps handling brine from mine workings. The complexity of phenomena occurring during actual flow of the brine through a pump justifies the need to build a laboratory test stand equipped with the model pump, imitating the conditions of industrial operation. In model pump, in which a jet of brine containing different concentrations of Cl ions and particulates is flowing, the surface degradation of samples corresponding to the degradation of industrial pump components takes place. The programme of research aimed at the determination of corrosive-erosive wear behaviour of Cr-Ni cast steels (18Cr-9Ni, 19Cr-11Ni-2Mo, F-A (24-27%Cr-5-6%Ni-2.5-2.8%Mo) and cast irons of Zl250 and ZsCu1.0 grade. The measure of wear was the loss of weight and changes in surface condition determined by scanning electron microscope (SEM) equipped with energy dispersive X-ray analyser (EDS) manufactured by EDAX company. Among the examined materials, the best wear resistance (the lowest wear rate) was observed in ferritic-austenitic (F-A) cast steel (24-27%Cr-5-6%Ni-2.5-2.8%Mo).

PL

W pracy zaprezentowano metodykę badań stopnia zużycia wybranych stopów żelaza stosowanych na elementy pomp, transportujacych solankę z wyrobisk kopalnianych. Złozoność zjawisk występujących podczas rzeczywistego przepływu solanki przez pompy, uzasadnia potrzebę budowy laboratoryjnego stanowiska badawczego wyposażonego w modelowa pompę imitujaca warunki panujące w pompach przemysłowych. W modelowej pompie, w warunkach przepływu solanki o różnym stężeniu jonów Cl i cząstek stałych, ulegają degradacji powierzchnie próbek odpowiadajace elementom składowym pomp przemysłowych. W programie badań określono zużycie korozyjno-erozyjne staliw z grupy Cr-Ni (18Cr-9Ni, 19Cr-11Ni-2Mo, F-A (24-27%Cr-5-6%Ni-2.5-2.8%Mo) i żeliw Zl250 i ZsCu1.0. Miernikiem zużycia jest zmiana masy i stanu powierzchni określana za pomocą mikroskopu skaningowego (SEM) wyposażonego w analizator dyspersji energii promieniowania rentgenowskiego (EDS) firmy EDAX. Sposród badanych materiałów najmniejsza szybkość zużycia odnotowano dla staliwa ferrytyczno-austenitycznego (F-A: 24-27%Cr-5-6%Ni-2.5-2.8%Mo).

2

Mechanical properties and corrosion behaviour of 18Cr-11Ni-2,5Mo cast steel

Kalandyk B., Starowicz M.

Archives of Foundry Engineering

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2009

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Vol. 9, iss. 4

87-90

EN

The study discusses the effect of variable carbon concentration (0,02; 0,07 and 0,14%) on the mechanical properties and corrosion resistance in 3,0% NaCl solution of 18Cr-11Ni-2,5Mo austenitic cast steel. It has been proved that at the concentration of 0,07%C, products made of the examined cast steel reveal on their surface some symptoms of local corrosion. Carbon concentration raised to 0,14%C results in advanced intercrystalline corrosion and the onset of local corrosion. Carbon concentration increased from 0,02 to 0,14% also results in the tensile strength UTS raised from 487MPa to 579MPa (a nearly 20% increase) with elongation El reduced from 55,3% to 49,6%, and reduction of area RA from 69,3% to 53,4%.

3

The characteristics of two-phase 22Cr-6Ni-2Mo-1,5Cu cast steel

Kalandyk B.

Archives of Foundry Engineering

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2008

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Vol. 8, iss. 4

61-64

EN

The paper discusses the effect of the casting wall thickness on the segregation of alloying elements in two-phase (F-A) 22Cr-6Ni-2Mo-1,5Cu cast steel. The values of the distribution coefficient k0 for Cr, Mo, Si, and Ni, Mn, Cu in the cast stepped test piece walls of three different thicknesses were determined. After solutioning, the values of Rm, R0,2, A5 and Z were measured in the wall of 45 mm thickness and were compared with the results obtained for austenitic cast steel of 18Cr-9Ni grade. In the examined cast steel also the content of [delta] ferrite and the value of PRE_N were determined.