Abstract
Effect of morphology of carbide and nitride precipitates on the elongation of Fe-30 mass%Cr alloys containing 0.026%C and 0.033%N was investigated. Three kinds of heat treatment process were adopted to obtain different types of the morphology of carbide and nitride precipitates, namely grain boundary carbide and nitride precipitates, coarse globular carbide particles (5 μm) within the grains, and fine spheroidal carbide and nitride particles (≤0.5 μm) within the grains. Tensile tests were carried out at temperatures ranging from 4.2 K to room temperature. The grain boundary carbide and nitride precipitates cause more remarkable decreases in the elongation than the carbide and nitride particles within the grains. Fine spheroidal carbide and nitride particles within the grains keep ductile-brittle transition temperature of the elongation lower than the coarse globular carbide particles within the grains. The flat plate-like continuous grain boundary nitride enhances intergranular fracture more than the discontinuous grain boundary carbide. Initiation of microcracks for brittle fracture is promoted by intergranular fracture of decohesion at the interfaces between the matrix and grain boundary precipitates.
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