Çeşitli bakır içeriğine sahip ASTALOY 85 Mo tozlarının sinterleme ile sertleştirilme çalışmaları.

In this thesis study, the effect of sinter hardening on mechanical properties of Astaloy 85 Mo (Fe - 0.85% Mo) powder with addition of 0.8% C and varying copper contents (1% Cu, 2% Cu) was examined. Powder mixes were compacted under 600 MPa. After compaction, the samples were sintered at 1120oC under endogas from methane in an industrial sintering furnace and were sinter-hardened with three different cooling rates (0.5oC/sec., 1.5oC/sec., 3oC/sec.). The study revealed that the cooling rate does not make critical changes on the microstructure of copper free samples. Addition of copper increased the hardenability of the samples which resulted formation of higher amount of martensite in the microstructure. The samples containing 2% Cu were nearly 100% martensitic. Also, the study showed that an increase in % Cu decreases the porosity content and increases the attained densities.M.S. - Master of Scienc