Explore the strengthening mechanisms of the ultra-low carbon and low alloy Steel

摘要

Room temperature tensile tests were carried on the hot-rolled state ultra-low carbon and low alloy cabainite and martensite steels which were get by different finishing temperatures and different cooling methods.We used the Scanning Electron Microscopy(SEM), Electron Backscattered Diffraction (EBSD) and X-Ray Diffractometer (XRD) to identify the metallographic structure and analyse the precipitated phase. The inherent mechanism of high strength of ultra-low carbon and low alloy bainite and martensite steels was discussed, and the analysis indicated that the reinforcement of ultra-low carbon and low alloy bainite and martensite steels was mainly produced by the superposition of the dislocation strengthening, solution strengthening and grain refinement strengthening.