抄録
In the automobile parts industry, it is well known that high-strength steel sheets possess low forming properties, which inherently limits their applications compared to conventional steel sheets. To mitigate this problem, a steel sheet was developed whereas heat treatment is carried out after forming, and maximum quenching hardness is realized based on careful microstructure observation analysis and additions of specific elements Moreover, in order to minimize the influence of deformation, post-heat treatment is performed locally on the sections of the automobile part where necessary (instead of applying it to the whole section of the part). Hence, confined strengthening can be achieved with the help of a local heat treatment method, thus widening the applications of high-strength steels for automobile parts.
