A simple method for grain refinement of low carbon dual phase steels

A simple method for grain refinement of low carbon dual phase steels was used, which is based on cold rolling and intercritical annealing. For this purpose, the effect of cold rolling reduction on the microstructure and tensile properties of low carbon steel after intercritical annealing was studied. It was revealed that by increasing the rolling reduction, the ferrite grain size of the dual phase (DP) microstructure is refined and a chain -like morphology of martensite develops, which results in improvement of tensile properties. It was also shown that by applying low reductions in thickness, abnormal grain growth (AGG) takes place during intercritical annealing, which is characterized by small grains and some large ferrite grains containing martensite islands. This study clarified that applying high reduction in thickness for grain refinement is the essential prerequisites to achieve the desired tensile properties.

کلیدواژه ها:

Dual phase steels ، Cold rolling ، Intercritical annealing ، Mechanical properties.