Akademik Veri Yönetim Sistemi
European Powder Metallurgy Congress and Exhibition, Euro PM 2005, Prague, Çek Cumhuriyeti, 2 - 05 Ekim 2005, cilt.1, ss.175-180
In this study, the applicability of intercritical annealing heat treatment, which is usually applied to high strength low alloy ingot steels (HSLA), to low alloy PM steels was investigated. For this purpose, atomized iron powder (Ancorsteel 1000) was mixed with 0.3% graphite and Ni ranging 0-2% (wt.). The mixed powders were cold pressed at 700 MPa and sintered at 1200 °C for 30 min under pure Ar gas atmosphere. To produce dual phase steel structure, the sintered specimens were annealed at intercritical heat treatment temperatures of 728 and 760 °C and then rapidly water quenched. The experimental results showed that while ferrite+martensite microstructure was produced in the specimen without Ni addition after intercritical annealing heat treatments, Ni-rich martensite islands in the ferrite matrix were seen in Ni-added specimens. Also, with increasing intercritical annealing temperatures and Ni content, martensite volume fraction increased and ferrite ratio decreased.