Strain Hardening Behaviour of PM Alloys with Heterogeneous Microstructure

Giovanni Straffelini

doi:10.4028/www.scientific.net/MSF.534-536.741

Paper Titles

Sintered Structural Cu-Ni-Mo-C Low Alloyed Steels with Small Niobium Additions
p.725

Sintering Processing of Compressor Flanges
p.729

Sintering Stainless Steels with Boron Addition in Nitrogen Base Atmosphere
p.733

Stable and Unstable Crack Growth in Chromium Pre-Alloyed Steel
p.737

Strain Hardening Behaviour of PM Alloys with Heterogeneous Microstructure
p.741

Stress Corrosion Cracking of Alloys 600, 690, and 800 in a Tetrathionate Solution at 340°C
p.745

Study of Elastic Moduli of Sintered Low Alloy Steels by Acoustic Pulse Method
p.749

The Effect of Chemical Composition of Sintering Atmosphere on the Structure and Mechanical Properties of PM Manganese Steels with Chromium and Molybdenum Additions
p.753

The Effect of Cooling Rate on the Structure and Mechanical Properties of Fe-3%Mn-(Cr)-(Mo)-C PM Steels
p.757

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Strain Hardening Behaviour of PM Alloys with Heterogeneous Microstructure

Abstract:

Tensile stress-strain and dynamic acoustic resonance tests were performed on Fe-C-Ni- Cu-Mo high-strength steels, characterized by a heterogeneous matrix microstructure and the prevalence of open porosity. All materials display the first yielding phenomenon and, successively, a continuous yielding behavior. This flow behavior can be described by the Ludwigson equation and developes through three stages: the onset of localized plastic deformation at the pore edges; the evolution of plastic deformation at the pore necks (where the austenitic Ni-rich phase is predominant); the spreading of plastic deformation in the interior of the matrix. The analytical modeling of the strain hardening behavior made it possible to obtain the boundaries between the different deformation stages.