Variation of Microstructures and Mechanical Properties of Hot Rolled Steel Sheets Subjected to Bending

Abstract

Steel plates for automobiles are subjected to large plastic deformation such as bending and press working. The local microstructures and mechanical properties can be changed significantly. In recent years, hot-rolled steel sheets have been applied to achieve higher strength and thinner wall thickness to reduce fuel consumption, but the relationship between the local microstructures and mechanical properties of hot-rolled steel sheets after processing is still unclear in many areas. This study investigated the effect of plastic working by bending on the local strength of hot-rolled steel sheets by evaluating the changes in microstructures and strength by ultra-small tensile tests.