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- W3036865534 abstract "Ultrahigh strength (UHS) steel is often achieved only at the expense of toughness. High hardness martensitic steels used for structural applications involving significant tensile loading and therefore requiring a K IC fracture toughness of 50 MPa. , are limited to a Rockwell C hardness (R c ) of 50-55. In UHS steels the failure mechanism is predominantly that of plastic shear instability in which flow localization leads to the formation of intense shear bands. The underlying cause of the flow localization is investigated here in an UHS (R c 55-56) 4340 steel. Azrin et al. have recently investigated the critical strain for shear localization in UHS 4340 steel under conditions of isothermal and adiabatic shear. The air melt 4340 steel of composition (wt.%): Fe-1.71Ni-0.75Mn-0.4lC-0.79Cr-0.25Si-0.24Mo-0.13Cu-0.011S-0.005P, was normalized at 910°C for one hour then austenitized at either 840°C or 1100°C for one further hour. Following austenitization, the specimens were stage I tempered at l60°C for one hour to form epsilon carbide and produce a peak hardness in the range R c 55-56. The fracture surfaces of the double linear shear test specimens were examined in a JEOL 35U SEM and the alloy microstructures were investigated using a combination of CBED, EDS and EELS on both jet electropolished thin foils and carbon extraction replicas in a Philips EM 420T S(T)EM." @default.
- W3036865534 created "2020-06-25" @default.
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- W3036865534 date "1989-08-06" @default.
- W3036865534 modified "2023-09-27" @default.
- W3036865534 title "The role of secondary hardening dispersions in the ductile failure of an ultrahigh-strength steel" @default.
- W3036865534 doi "https://doi.org/10.1017/s0424820100153075" @default.
- W3036865534 hasPublicationYear "1989" @default.
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