Fe-30%Cr合金の機械的性質に及ぼす炭化物および窒化物の影響
1990 年 54 巻 1 号 p. 93-100
詳細
1990 年 54 巻 1 号 p. 93-100
Effects of carbide and nitride precipitates on the mechanical properties of Fe-30%Cr alloys with C from 0.001 to 0.12% and of those with N from 0.004 to 0.13% were investigated. Charpy impact tests at various temperatures and tensile tests at room temperature were carried out for the specimens water-quenched from 1123 K.
The results obtained are summarized as follows.
(1) The ductile-brittle transition temperature determined by the impact test is well-correlated with the volume fraction of carbide and nitride precipitates, and not with the chemical composition of C, N, or (C+N). The transition temperature first increases remarkably with the volume fraction of these precipitates up to 0.4 vol%, and then remains almost constant for 0.6 vol% and above.
(2) The temperature range of ductile to brittle transition in the absorption energy and temperature curve is narrow for the specimens containing carbide, and wide for the specimens containing nitride.
(3) The strain at fracture in the tensile test decreases with increasing the volume fractions of carbide and nitride.
