THE INFLUENCE OF Mo, Cr AND B ALLOYING ON PHASE TRANSFORMATION AND MECHANICAL PROPERTIES IN Nb ADDED HIGH STRENGTH DUAL PHASE STEELS
The influence of Nb,Mo,Cr and B on phase transformations and mechanical properties are studied in a 0.15C-2.0Mn-0.3Si-0.020Ti dual phase steel separately and in combination.The formation and decomposition of austenite together with recrystallization of ferrite are evaluated by dilatometry and constructed CCT-diagrams in laboratory processed cold rolled material cooled after full austenitization and from intercritical temperature range.The effect of alloying elements on formation of austenite through their effect on initial hot rolled structure is taken into account.The interpretation of phase transformations during heating and cooling is supported by metallography.The effect of alloying elements on mechanical properties and structure are evaluated by annealing simulations.It has been shown that mechanical properties are strongly influenced by alloying additions such as Nb,Mo,Cr and B through their effect on ferrite formation during continuous cooling and corresponding enrichment of remaining austenite by carbon.Depending on combined effect of these alloying elements,different phase transformations can be promoted during cooling.This allows controlling of final microstructural constituents and mechanical properties.
austenite transformation CCT-diagrams continuous annealing martensite bainite
Girina O. Fonstein N. Yakubovsky O. Panahi D. Bhattacharya D. Jansto S.
ArcelorMittal Global Research East Chicago 3001 E.Columbus Dr.,E.Chicago,IN 46312,USA CBMM North America,Inc.1000 Old Pond Rd.,Bridgeville,PA 15017,USA
国内会议
杭州
英文
237-245
2015-11-11（万方平台首次上网日期，不代表论文的发表时间）