A Study on Tempering Effect on the Residual Stress of Bimetallic Roll for Uniform and Non-Uniform Heating

摘要

Several studies on wear resistance, surface roughness, and center toughness have been done by many researchers to improve the work roll performance in steel rolling industries. In order to meet such different demands, bimetallic rolls have been used to replace the conventional single material rolls. Generally, compressive residual stress is introduced to prevent the surface cracking and tensile residual stress at the center appears to balance the compressive residual stress. However, this center residual stress sometimes causes the roll failure and breakage. Therefore, in this paper the finite element method (FEM) simulation is performed for the quenching process of the bimetallic roll by considering the creep behavior. Then the effect of pre-heating conditions is discussed. The results show that the maximum stress point for the tensile stress at the roll center for non-uniform heating is 24%less than the uniform heating, although the same compressive stresses appear at the surface. Then by using different area ratios, the center tensile stress for non-uniform heating is smaller than the uniform heating.