Cold rolled dual phase steel was developed from Q345 steel by heat treatment procedure for automotive applications. The ultimate tensile strength was improved about 100MPa higher than the traditional cold-rolled Q345 steel in the continuous annealing simulation experiment. The microstructure presented varied characteristics in different intercritical annealing temperatures; mechanical properties were changed correspondingly as well. The chief discussions are focus on the recrystallization, hardenability of austenite and martensite transformation in the experiment.
As significant theory evidence in thick plate or heavy gauge plate hot rolling, the deformation behavior at the thickness direction was investigated. In the present work, multi and single pass rolling processes were studied by 2D explicit dynamic finite element method (FEM) simulation and verified by laboratory hot rolling experiment. The value of stress and strain could be obtained in any passes and time in the hot rolling process accurately. The verified FEM model could be used as an important reference factor for other hot rolling processes. Strain and stress distribution data was obtained from four portions at the thickness direction. A cooper rod was knocked into the hot rolling specimen, as a reference substance to observe the deformation after the hot rolling experiment. In the multi-pass simulation with nearly 10% per-pass reduction, the core metal yield when the total reduction was 40%. The same performance could be achieved when the first pass reduction larger than 20%. However, extremely first pass reduction would cause an instability deformation result in a confusion of microstructure. Finally, the relation between the reduction and the number of rolling passes was discussed.
The35kg ingot was refined with vacuum induction furnace by means of three various deoxidationprocesses in laboratory. From the steel-making point of view, effect of deoxidationprocess on inclusions and was analyzed. The fraction, size and distribution ofinclusions were studied with scanning electron microscope (SEM)and energy dispersive spectrometer (EDS) in three various deoxidation processessteel . The results showed that the volume fraction of inclusions was thelargest in Ti/Zr deoxidation process and the inclusions distributed uniformly. Itwas found that the amount of fine inclusions size in the range of 0.5~1.5 μmwas the largest atTi/Zr deoxidation process. The fraction of inclusions decreased with holdingtime increasing during alloying in present study.
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