Role of Alloying Additions in the Solidification Kinetics and Resultant Chilling Tendency and Chill of Cast Iron

Metals

Edward Fraś²  Hugo F. Lopez¹  Magdalena Kawalec²  Marcin Gorny² 

[1] Department of Materials Science and Engineering, University of Wisconsin Milwaukee, 3200 N. Cramer Street, Milwaukee, WI 53211, USA;Foundry Institute, AGH University of Science and Technology, Reymonta 23, Cracow 30-059, Poland; E-Mails:

关键词: chill;    chilling tendency;    gray cast iron;    role of C;    Si;    Mn;    P;    Mn;    inoculation effects;   

DOI  :  10.3390/met5010256

来源: mdpi

【 摘 要 】

The present work describes the effect of the solidification processing and alloy chemistry on the chilling tendency index, CT, and the chill, w, of wedge-shaped castings made of cast iron. In this work, theoretical predictions were experimentally verified for the role of elements, such as C, Si, Mn, P and S, on the cast iron CT. In addition, inoculation and fading effects were considered in the experimental outcome. Accordingly, the graphite nucleation coefficients, N_s, b, the eutectic cell growth coefficient, μ, and the critical cooling rate, Q_cr, for the development of eutectic cementite (chill) were all determined as a function of the cast iron chemistry and time after inoculation. In particular, it was found that increasing the Mn and S contents, as well as the time after inoculation lowers the critical cooling rate, thus increasing the chilling tendency of the cast iron. In contrast, C, Si and P increase the critical cooling rate, and as a result, they reduce the cast iron CT and chill.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.