Abstract
High-N austenitic stainless steel was prepared by injection molding and sintering under nitrogen atmosphere by using gas atomized Cr-Mn-Mo-N duplex stainless steel powders. The powders and binder were mixed, injected, debinded and sintered. Effect of sintering temperature and solution treatment on microstructure and mechanical properties were studied. It shows that sintering temperature has significant effect on N content and density. With the increase of sintering temperature, the sample density was increased, but the N content was decreased. Samples sintered at 1200 °C was composed of austenite and Cr2N, while only austenite can be detected by XRD for samples sintered at 1250 and 1300 °C. The fracture mode of the samples sintered at 1200 and 1250 °C is brittle fracture, along the 45° direction and stress axis, but samples sintered at 1300 °C did not fractured at the maximum load (21 kN) and showed ductility during compression. After solution treatment, the Cr2N was disappeared and samples sintered at 1250 °C did not fractured during compression.
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