Effect of Thermal Treatment on Increase in the Plasticity of Molybdenum-Doped Iron–Copper Pseudoalloys


I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2012, #07/08


The effect of thermal treatment on the mechanical properties and microstructure of Fe–30% Cu 10% Mo pseudoalloys is studied. The specimens were pressed from mechanically activated metal powder mixtures subjected to solid-state sintering (SSS) and liquid-state sintering (LSS) at 1000 and 1130 ºС. Sintering was followed by quenching and tempering. It is shown that molybdenum addition to Fe–Cu pseudoalloys activates compaction both during SSS and LSS (residual porosity about 1%). The interdiffusion of all three components leads to the formation of stable heterophase fine-grained microstructures preventing grain growth and improving the plasticity of the FeCuMo pseudoalloys. Thermal treatment increases strength and retains high plasticity of FeCuMo. The FeCuMo samples produced by SSS and LSS show optimum values of ultimate strength (683–694 MPa and 741–752 MPa), elongation (12.1–12.4% and 8.2–9.4%), and contraction (24.0–25.9% and 12.5–19.7%) after thermal treatment.