AFS Library

A STUDY OF DECARBURIZATION ACCOMPANYING THE CASTING OF STEEL IN CERAMIC MOLDS

19700795
Journal: AFS TRANSACTIONS 1970, p. 338-342
Author: G.E. Doremus & C.R. Loper

This study has demonstrated that decarburization associated with the casting of steel into the Avnet-Shaw process molds can be related to the mold temperature and the casting cooling rate. Decarburization can be completely eliminated by flushing all O2 from the mold and replacing it with high purity Ar. Hexamethylene tetramine (HMT), (CH2)6N4 additions are not effective in eliminating decarburization but rather recarburize the steel surface after a given amount of decarburization has occurred. The effective use of HMT is highly process sensitive since it may result in a decarburized zone beneath the casting surface. Certain mold additions were found to be effective in reducing or eliminating decarburization of 8620 or 52100 steel. Carbon additions reduced decarburization but their effect depended upon the particle size of the addition--the optimum size being about 100 mesh. Of a series of deoxidizers studied, ferroboron and ferromanganese additions (2%) were found to essentially eliminate decarburization in the 52100 steel. Additions of Ti, Mg-bearing ferro-silicon, Si- Mn and ferrovanadium were also effective in reducing the amount of decarburization in 8620 and 52100 steels.



$15.00 for members
$10.00 for corporate members
$30.00 for nonmembers


or Search again