Fracture toughness of some high density PM steels

R.A. Phillips, J.E. King, J.R. Moon

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Tensile strengths, impact energies, and fracture toughness data are presented for pure Fe-0.5 C, Astaloy A with 0.2 and 0.6%C, and for Distaloy AB-0.6%C at relative densities of about 0.9, achieved by conventional pressing and sintering, and at close to 1.0, achieved by powder forging. At low relative density, properties are controlled by sizes of sinter necks; it is postulated that toughness scales as (x/a)4, x/a being the ratio of neck diameter to particle diameter. At high relative density, microvoid coalescence and good toughness is observed for low strength microstructures whereas cleavage and poor toughness is a concomitant of high strength.

    Original languageEnglish
    Pages (from-to)43-48
    Number of pages6
    JournalPowder Metallurgy
    Volume43
    Issue number1
    DOIs
    Publication statusPublished - Jan 2000

    Keywords

    • coalescence
    • sensity (specific gravity)
    • forging
    • fracture toughness
    • metal pressing
    • metallographic microstructure
    • sintering
    • tensile strength
    • mpact energy
    • steel

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