Rare earth metals influence on morphology of non-metallic inclusions and mechanism of GP240GH and G17CrMo5-5cast steel cracking

• Autorzy: Gajewski M. , Kasińska J.
• Języki publikacji: EN

Abstrakty

EN

This paper presents results of research carried out in order to specify the influence of the rare earth metals on the morphology of the occuring non-metallic inclusions as well as on the cracking mechanism of GP240GH cast carbon steel and G17CrMo5-5 (0.18%C, 1.2%Cr, 0.53%Mo) high temperature cast steel. The tests have been performed on successive industrial melts adding rare earth metals to the ladle during tapping of heat melt from the furnace. It was found that ball-shaped non-metalic inclusions occuring as a result of the rare earth metals influence are heterogenic and they significantly influence the cracking mechanism of Charpy specimens and the impact strength. The morphology of the specimens fracture surface has been substantially changed as a result of the rare earth metals modification. The impact strength of the tested cast carbon steel increased from 100 J/cm2 to ca 155 J/cm2, and the high-temperature cast steel from 30 J/cm2 to ca 100 J/cm2.

Słowa kluczowe

EN

cast steel; rare earth metals; modification; non-metallic inclusions; fractography

PL

staliwo; metale ziem rzadkich; wtrącenia niemetaliczne; fraktografia

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2009
• Tom: Vol. 9, iss. 4
• Strony: 45--52
• Opis fizyczny: Bibliogr. 7 poz., rys., tab., wykr.

Twórcy

autor

Gajewski M.

autor

Kasińska J.

• Department of Metal Science and Materials Technology, Kielce University of Technology, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland,

Bibliografia

• [1] Waudby P. E., Rare earth additions to steel, Intern. Metals Rev., vol.23, No 2, 1976, 74 - 99.
• [2] Luniov V. V., Non-metallic inclusions and cast steel properties, Przegląd Odlewnictwa, vol.53, No 9, 2003, 299 - 304, (in Polish).
• [3] Blicharski M., Material Engineering. Steel, WNT, Warsaw, 2004, (in Polish).
• [4] Lis T., Różański P., Non-metallic inclusions engineering in liquid steel, Hutnik - Wiadomości hutnicze, No 5, 2005, 259 - 264, (in Polish).
• [5] Long - Mei Wang, and others, Study of application of rare elements in advanced low alloy steels. Journal of Alloys and Compounds, No 451, 2008,534 - 537.
• [6] Kocańda S., Fatigue deterioration of metals, WNT, Warsaw, 1978 (in Polish).
• [7] Neimitz A., Mechanics of cracking, PWN, Warsaw 1998 (in Polish).