Effect of Sulfide Former Elements on the Hot Ductility of High Ni-Cr Steels and Ni-base Alloys

Abstract

A study was made to search the beneficial elements and the quantity to be added, in order to improve the hot ductility of high Ni-Cr steels and Ni-base alloys by addition of sulfide former elements. It was found that good ductility was obtained by addition of elements having much larger atomic radius than Ni, and their amounts were required to be sufficient for sulfide formation but not to be excess. Namely, it was necessary to fix sulfur in the alloys as ZrS, MgS etc. and not to form metallic compounds having low melting point