EFFECT OF NITROGEN ON MATRIX STRUCTURE OF GRAY CAST IRON
HU Hanqi University of Science and Technology BeijingZHAI Qijie;associate professor;Faculty of Foundry;University of Science and Technology Beijing;Beijing100083
Cite this article:
HU Hanqi University of Science and Technology BeijingZHAI Qijie;associate professor;Faculty of Foundry;University of Science and Technology Beijing;Beijing100083. EFFECT OF NITROGEN ON MATRIX STRUCTURE OF GRAY CAST IRON. Acta Metall Sin, 1993, 29(5): 28-30.
Abstract Effect of nitrogen on matrix structure of 3 different varieties of gray cast iron.i.e., sub-eutectic Fe-C-Si, and near-eutectic Fe-C-Si and Fe-C-Si-Mn, has been investi-gated. The eutectic colony structure of gray cast iron may be refined, the pearlite content in-creased and the microhardness of pearlite and ferrite raised with an addition of nitrogen. Theinfluence of nitrogen on the transformation temperature of the equilibrium and non-equilib-rium phases, as well as, the solution of nitrogen in ferrite and cementite seem to be the majorreasons to strengthening the matrix structure of gray cast iron.