Abstract
Metastable lath martensite (α L ′ ) phase wires with high strengths have been produced in the Fe-Ni-Cr-Al-C alloy system by melt spinning in rotating water. These wires have a circular cross section and a white lustre and the wire diameter is in the range of 100 to 140μm. The width and length of each lath in theα L ′ phase are as small as about 0.3 and 2μm, respectively. Theσ y,σ f ande p are about 900 and 1650 MPa and 2.0% for theα L ′ wires. The subsequent annealing causes an increase in ep as well as σy and σf and the attained values are about 1000 and 1700 MPa and 3.0% for Fe-10Ni-10Cr-6.5 Al-1.0C wire annealed at 773 K for 1 h owing to the precipitation strengthening of a very fine unidentified carbide and to a high density of dislocations and lath boundaries in theα L ′ phase. Further annealing causes a significant decrease in ep through decomposition ofα L ′ toα+M7C3+M23C6. Therefore, the high strength combined with relatively good ductility for theα L ′ wires is interpreted as due to the suppression of the phase transformation ofα L ′ to a mixed structure ofα+M7C3+M23C6 by melt quenching.
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