Résumé

High-nitrogen content austenitic stainless steel parts have been processed by injection moulding of a novel feedstock composed of gas atomized P558 stainless steel powder and biopolymer-based binder. The binder formulation consists of polyhydroxyalkanoate backbone polymer produced by bacterial fermentation, filler wax and surfactant. The solids loading was 60 vol.%. Tensile test specimens were injection moulded, debinded and sintered at 1270°C under nitrogen. The microstructure was characterized by metallographic observation, X-ray diffraction and X-ray computer tomography. Yield stress of 600 MPa, ultimate tensile strength of 900 MPa were achieved, meeting the reference values of the wrought alloy.

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