Investigation of Hot Deformation Effect on Martensite and Bainite Transformation in Two Super High Strength Steels
In this article two CCCT ( Compression Continuous Cooling Transformation) diagrams of steel NiCrMoV and one CCCT diagram of steel CrMoV, dynamic and static hot deformation tests were drawn by using respectively. In comparison to the CCCT and CCT (Continuous Cooling Transformation) diagrams in two steels, it can be deduced Md, Bd have been increased. It seems that temperature of deformation is the most effective parameter affects on Md and Bd. If deformation temperature is selected so that SRX (Static Recrystallization) or DRX (Dynamic Recryastallization) is onset, the Md and Bd increase. Also the kind of deformation affects on more austenite grain size than shifting Md and Bd. In addition, in all CCCT diagrams, bainite areas have been developed. It means Bd dominates Md. It seems, that is because of grain refinement of austenite grains that causes promoting BN (Bainite Nucleation) in comparison to MN (Martensite Nucleation). It was observed by deformation, the lamellar martensite and bainite lathes have gotten thinner and finer and their parcels got smaller. In addition, it is predicted existing many types of carbide, and nitrides by stabilizer elements as Cr, Mo, V and Si cause increasing strength and hardenability of these steels and Ni and Mn are two only elements that inhibit forming ferrite and pearlite.
CCCT SRX DRX Hot Deformation
R.Taherian A.Baparib A.Najafizadeh R.Shateri
Ph.D Student in “Shiraz University, Material Engineering Faculty, Shiraz, Iran M.Sc in “Isfahan University of Technology, Material Engineering Faculty, Isfahan, Iran Full Professor in “Isfahan University of Technology, Material Engineering Faculty, Isfahan, Iran
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）