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- W2018192419 abstract "Abstract An investigation into the effects of high temperature austenitization (h.t.a.) on the monotonic fracture behavior of cast and forged high strength steels has been carried out. The h.t.a. increased the fracture toughness, the ductility and the impact toughness of the cast steel, whereas the ductility and impact toughness of the forged steel were reduced. Both the critical fracture stress and strain of the cast steel were enhanced by h.t.a., but the fracture strain of the forged steel decreased. Analysis of microstructural differences and fracture micromechanisms revealed that the higher ductility and impact toughness of h.t.a. cast steel than those of h.t.a. forged steel could be related to a smaller austenite grain, finer martensite packet and lath size, and the discontinuous nature of the interlath retained austenite film. The slight improvement in ductility and impact toughness of cast steel after h.t.a. compared with conventional temperature austenitization (c.t.a.) correlates with a reduction in the dendritic and impurity segregation. The fracture toughness of the cast and the forged steels austenitized at different temperatures has been analyzed using stress-controlled and stress-modified strain-controlled fracture models. The actual fracture stress and strain over the range of the fracture process zone are very different from those determined by notch bending or plane strain tensile tests, and the characteristic distances calculated from the above models were found to have no meaningful relation with the microstructural parameters important to fracture initiation. The improved fracture toughness is a result of a higher local fracture strain ahead of the crack tip for strain-controlled fracture and a larger characteristic distance for stress-controlled fracture in both the cast and forged steels." @default.
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- W2018192419 date "1989-03-01" @default.
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- W2018192419 title "Effects of high temperature austenitization on fracture, fatigue and stress corrosion cracking behavior of cast and forged high strength steels I: Monotonic fracture behavior" @default.
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- W2018192419 doi "https://doi.org/10.1016/0921-5093(89)90166-4" @default.
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