The effect of Austenitic grain size on Nickel-Chromium Steels

Abstract

In continuation of the study of Austenitic grain size control, the present paper deals with the effect of grain refinement by aluminum addition on the physical properties, grain growth with temperature and thermal critical ranges of two nickel chromium experimental steels made from the same cast. In agreement with the results obtained previously with other plain carbon and low alloy steels, higher grain coarsening temperature. Judicious addition of a very small quantity of aluminum to a high alloy steel has been found to refine the grain size, improve the toughness and raise the coarsening temperature, the beneficial effect being similar to that obtained with plain carbon and low alloy steels. Thermal critical ranges are not altered by the small quantity of aluminum added to control the austenitic grain size.