Abstract
Abstract Fracture behavior in tempered martensite embrittlement (TME) has been analyzed for the medium-carbon 6W-3Ni(WN3) and 6W-6Ni(WN6) steels, where tungsten lowers the intrinsic toughness and nickel enhances it, tempered in the range 200–400 °C. In order to investigate the fracture mode with test temperature, the impact testing was performed in the range −196 to 100 °C. In both steels, intergranular TME was observed in the specimens tempered at 300 °C condition where the coarse boundary-carbides were formed. At very low temperatures, however, the differences between both steels were clearly revealed. At −196 °C, the WN3 steel exhibited brittle transgranular fracture and very little TME trough, whereas the WN6 steel showed a mixture of intergranular and less brittle transgranular fractures, and a clear TME trough was observed.
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