Metallurgy, Vol. 42 No. 1, 2003.
Original scientific paper
Microstructure, Mechanical Properties and Failure of Fe-3Mn-0.7C Sintered Steel
E. Dudrová
M. Kabátová
R. Bidulský
Abstract
Mechanical properties of Fe-3Mn-0.7C sintered steel were determined in tension and in bending following laboratory and industrial sintering at the temperatures of 1120, 1180 and 1200 °C in a H2-rich atmospheres with the dew points of -33 °C and/or - 30 °C and -55 °C and/or - 60 °C. The microstructure of sintered specimens is complex and heterogeneous, formed by products of the diffusive and non-diffusive transformations. The highest strength properties of the tested alloy were recorded after sintering at 1200 °C in dry atmosphere: R0.2 = 490 MPa, Rm = 642 MPa, bend strength of 1256 MPa, apparent hardness of 207 HV10, tensile and maximum bend strains were 1.02 and 3.6 %. The reproducibility of tensile and bend strengths data was high, characterised by Weibull module, m, of 12 - 38. The large pores or their agglomerates (50 - 70 µm in size) act as the failure originating sites in the tensile and bend specimens.
Keywords
Hrčak ID:
128470
URI
Publication date:
1.1.2003.
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