Study on the Mechanical Properties and Microstructure of Partially-diffuse Alloyed Fe-Cu-Ni-Mo-C Materials

The warm compacting behavior,mechanical properties and microstructure of sintered and heat treated of partially-diffuse alloyed Fe-2Cu-2Ni-1Mo-1C powders were studied in this paper.Results show that die wall lubricated warm compaction technology could improve the densities and mechanical properties of Fe-2Cu-2Ni-1Mo-1C materials.At 130 ℃,green density,sintered density and mechanical properties of the sintered materials increase when the compacting pressure increased from 400 MPa up to 700 MPa.Materials have a green density of 734 g/cm3,sintered density of 7.32 g/cm3,tensile strength of 853 MPa,apparent hardness of 302 HB and elongation of 4.4% when formed at a compacting pressure of 700 MPa and sintered at 1 150 ℃ in hydrogen atmosphere for 60 min.Mechanical properties of heat treated Fe-2Cu-2Ni-1Mo-1C materials are enhanced obviously.The optimum mechanical properties were obtained when the materials quenched from 880 ℃ and tempered at 350 ℃ for 60 min.Materials had a tensile strength of 1 086 MPa,apparent hardness of 295 HB and elongation of 3.7%.Martensite,temper troostite and retained austenite are observed in the microstructure.