Effect of microstructure on transformation-induced plasticity of silicon-containing low-alloy steel
- Osaka Prefecture Univ., Gakuen, Sakai (Japan). Dept. of Metallurgy and Materials Science
- Technology Research Inst. of Osaka Prefecture, Izumi City (Japan)
Fe-0.6C-1.5Si-0.8Mn steel was studied to determine the effect of the microstructure on transformation-induced plasticity (TRIP) of silicon-containing low-alloy steel. A remarkable increase in elongation through TRIP can develop in the steel subjected to the following heat treatments: (1) austemper combined with subcritical annealing (SA Aus-T): subcritical annealing at 993K followed by austempering at 673K and then light tempering (after austenitization at 1173K); (2) austemper coupled with interrupted quenching (IQ Aus-T): interrupted quenching at 533K followed by austempering at 673K and light tempering (after austenization at 1,173K). The SA Aus-T treatment produced the triple structures of carbide-free upper bainite, retained austenite ({gamma}R), and free ferrite. As a result of the IQ Aus-T treatment, the triple structures of carbide-free upper bainite, {gamma}R, and tempered martensite appeared. The results are described and microstructural factors in TRIP are discussed.
- OSTI ID:
- 554095
- Journal Information:
- Materials Characterization, Vol. 38, Issue 4-5; Other Information: PBD: Apr-Jun 1997
- Country of Publication:
- United States
- Language:
- English
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