Evolution of Phases and Mechanical Properties of Thermomechanically Processed Ultra High Strength Steels
作者： S. Chatterjee , S. K. Ghosh
DOI: 10.1007/S12666-013-0293-3
关键词: Ductility 、 Weldability 、 Austenite 、 Metallurgy 、 Hardenability 、 Martensite 、 Charpy impact test 、 Materials science 、 Specific strength 、 Continuous cooling transformation
摘要: The present study concerns the development of two low carbon microalloyed ultra high strength steels on a pilot scale. This recent endeavour has been made towards reduction weight by achieving to ratio together with improved weldability for various prospective performance defence applications such as explosive ammunition, gun barrel, missile skins, light-weight military bridges etc. These were thermomechanically processed and finished at different finish rolling temperatures followed water quenching. Variation in microstructure mechanically properties was studied. experimentally determined continuous cooling transformation diagrams have revealed that adequate hardenability is achievable these usually rate >5 °C/s. Lath martensite along microalloy (Ti, Nb) CN precipitate particles are characteristic microstructural feature investigated steels. value obtained due accumulated contribution fine grained pan-caked austenite, highly dislocated lath presence tiny precipitates carbide/carbonitride Cu rich precipitates. good combination (1,364–1,538 MPa) ductility (11–16 %) achieved selected range temperature. Charpy impact toughness values (30–80 J) reveal approximately consistent fall lowering testing
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