|About this Abstract
||Materials Science & Technology 2012
||Recent Developments in High Strength Steels for Energy Applications
||Ferrite-Martensite Duplex Microstructure and Mechanical Property of a HSLA Steel
||Lian-yu Zhao, Wei Yan, Wei Wang, Xian-bo Shi, Yi-yin Shan, Ke Yang
|On-Site Speaker (Planned)
The microstructure and mechanical property of a high strength low alloy steel after heat treated at different temperatures from 700 to 820℃ was investigated. Dual-phase microstructure containing finely dispersed martensite with different volume fractions was produced by water quenching. The volume fraction of martensite phase varied from 15% to 80% with the increasing of heat treatment temperature. Ferrite-martensite duplex microstructure displayed obvious difference compared with the as-received sample. The tensile strength was improved while the yield strength was decreased, thus the yield/tensile ratio was decreased prominently, which means better deformability. The tensile curve showed round-roof-shape, which implies excellent strain hardening ability. The work hardening exponent showed continuous change with the accumulation of plastic deformation. The charpy-V-notch impact property was also detected and proved non-deterioration when the martensite volume fraction was 50%~70%.
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