Nickel-free P558 Austenitic Steel Parts Processed from Metal Powder - PHA Biopolymer Feedstocks

摘要

In this work, the feasibility of a novel processing route for high-nitrogen content austenitic steels isexplored. Feedstock for powder injection moulding was prepared with gas atomized P558 stainlesssteel powder and binder containing a natural polymer as backbone polymer. Binders consisting of45 wt% P(3HB-co-3HV) processed by bacterial fermentation, 45 wt% paraffin wax and 10 wt% stearicacid were employed. The solids loading was 60 vol.%. Tensile test specimens were injection mouldedand subsequently subjected to solvent debinding in heptane, thermal debinding at 500℃ and sinteringat 1270℃ under nitrogen. The microstructure was characterized by metallographic observation and Xraydiffraction. Yield stress values of 600 Mpa, ultimate tensile strength of 900 Mpa and elongation of25% were achieved.