Ultrasonic Testing of Vermicular Cast Iron Microstructure

• Autorzy: Tupaj M. , Orłowicz A. W. , Mróz M. , Kupiec B. , Pająk D. , Kawiński M.

Identyfikatory

DOI

10.24425/afe.2020.133345

• Języki publikacji: EN

Abstrakty

EN

The paper presents results of a study on the effect of passage of time on magnesium content in iron alloys and the effect of magnesium content on the number of vermicular graphite precipitations per unit surface area and value of the longitudinal ultrasonic wave velocity for two different vermicularization methods. The study was carried out with the use of inspection bar castings. For specific production conditions, it has been found that in case of application of both the cored wire injection method and the method of pouring liquid metal over magnesium master alloy on ladle bottom, the satisfactory level of magnesium content in the bottom-pour ladle, for which it was still possible to obtain castings with vermicular graphite, was 0.018% Mg. In case of the cored wire injection method, the “time window” available to a pouring station at which castings of vermicular cast iron are expected to be obtained, was about 5 minutes. This corresponds to the longitudinal ultrasonic wave velocity values exceeding 5500 m/s and the number of graphite precipitations per unit surface area above 320 mm^-2. In case of the master alloy method, the respective “time window” allowing to obtain castings of vermicular cast iron was only about 3 minutes long. This corresponds to the longitudinal ultrasonic wave velocity value above 5400 m/s and the number of graphite precipitations per unit surface area above 380 mm^-2.

Słowa kluczowe

EN

vermicular cast iron; vermiculatization method; microstructure; ultrasonic testing; graphite precipitation surface density

PL

żeliwo wermikularne; wermikulatyzacja; mikrostruktura; badanie ultradźwiękowe

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2020
• Tom: Vol. 20, iss. 4
• Strony: 36--40
• Opis fizyczny: Bibliogr. 6 poz., rys., tab.

Twórcy

autor

Tupaj M.

• Rzeszow University of Technology, Rzeszów, Poland

autor

Orłowicz A. W.

• Rzeszow University of Technology, Rzeszów, Poland

autor

Mróz M.

• Rzeszow University of Technology, Rzeszów, Poland

autor

Kupiec B.

• Rzeszow University of Technology, Rzeszów, Poland

autor

Pająk D.

• Rzeszow University of Technology, Rzeszów, Poland

autor

Kawiński M.

• Cast Iron Foundry KAWMET, Orły, Poland

Bibliografia

• [1] Guzik, E. (2001). Cast iron improving processes. Selected problems. Archives of Foundry, Monograph Nr 1 M. (in Polish).
• [2] Guo, X. (2003). A statistical study on the relationship between tensile strength and ultrasonic velocity of cast iron. International Journal of Cast Metals Research. 16, 221-226.
• [3] Orłowicz, W., Tupaj, M., Mróz, M. & Guzik, E. (2010). Evaluation of ductile iron casting material quality using ultrasonic testing. Journal of Materials Processing Technology. 210, 1493-1500.
• [4] Griffin, J.A. & Griffin, R.D. (2006). Compacted Graphite Iron and Ultrasonic Testing. Ductile Iron News. 2.
• [5] Li, H., Griffin, R.D. & Bates, L.E. (2005). Gray iron property measurements using ultrasonic techniques. AFS Transactions. 05-125(05), 1-11.
• [6] Voronkova, L.V. (2006). Ultrasonic testing possibilities of cast iron ingots. ECNDT Th.2.2.3, 1-13.