Abstract
Effects of Ti carbide precipitates on the ductility and toughness of 30 mass%Cr steels containing above 0.1%C and 1%Ti were investigated by tensile and impact tests at low temperatures. Two kinds of heat treatment of aging after solution treatment (process SA) and annealing without solution treatment (process A) were performed for the test pieces. The ductility and toughness were evaluated by ductile-brittle transition temperature (DBTT) in reduction of area and DBTT in absorption energy, respectively. Both the processes SA and A produce coarse globular Ti carbide particles within the grains in the 2 μm size range and cluster-like coarse globular Ti carbides at grain boundaries. The process SA does not bring about numerous fine grain boundary Ti carbides for the specimens containing above 0.1%C, which is contrary to those for the specimens containing below 0.07%C. DBTTs determined by the tensile test for the specimens with above 0.1%C after the process SA are lower than those of the specimens in a range from 0.04% to 0.07%C, while DBTTs determined by the impact test for the former specimens are higher than those of the latter specimens. The effect of morphology of Ti carbide on the DBTT determined by the tensile test and that on the DBTT determined by the impact test are different. The numerous fine grain boundary Ti carbides exert detrimental effect on the former DBTT. On the other hand, the numerous fine grain boundary Ti carbides and the coarse globular Ti carbides exert detrimental effect on the latter DBTT.
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