Fracture toughness of some high density PM steels

Phillips, R.A.; King, J.E. and Moon, J.R. Fracture toughness of some high density PM steels. Powder Metallurgy, 43 (1), pp. 43-48.

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.

Divisions: Aston University (General)
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Uncontrolled Keywords: coalescence,sensity (specific gravity),forging,fracture toughness,metal pressing,metallographic microstructure,sintering,tensile strength,mpact energy,steel,Metals and Alloys

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