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Influence of the Sulfur Content on the Mechanical Properties of a TRIP/TWIP‐Matrix Composite Reinforced with 10 vol% Mg‐PSZ

The influence of the sulfur content (0.02 wt%, 0.1 wt%) within the steel phase (16 wt% Cr, 6 wt% Mn, 9 wt% Ni) of a TRIP/TWIP‐matrix composite, reinforced with 10 vol% MgO‐partially stabilized zirconia (Mg‐PSZ), produced by spark plasma sintering (SPS) is investigated. By increasing the sulfur content of the steel phase, the powder particle size after gas atomization is reduced. Hence, the steel/Mg‐PSZ‐particle size ratio decreases and the distribution of the Mg‐PSZ is improved. Within this study, the effect of the sulfur content on microstructure and flow behavior under compressive loading are determined. With increasing sulfur content, the 1% compressive yield strength increases by 40 MPa. The sulfur forms precipitations with chromium and manganese especially at the steel/Mg‐PSZ interfaces, which cause a destabilization of the Mg‐PSZ during sintering. The destabilization prevents a possible stress‐induced phase transformation of the Mg‐PSZ.