Abstract
In this study, the effects of sulfide transformation on mechanical properties and microstructure in Fe-Cu-C alloys were investigated. Taking advantages of self-lubricating and free-cutting of different sulfides, the sulfide transition in iron-based alloys mainly included two parts. Firstly, a thin layer of FeS film was coated on the iron powder surface during annealing, acting as solid lubricant to reduce the compaction friction. Then, in situ MnS with particle size of 1-2 μm was formed followed by the reaction of FeS and Mn during sintering. Consequently, the sintered density reached to 7.34 g/cm3 and the machinability significantly improved with less tool wear. Besides, the mechanical performance was also enhanced. The hardness increased from 80.5 HRB to 84.1 HRB, and the tensile strength increased from 590 to 631 MPa. The MnS phase was mainly distributed along the grain boundaries.
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