Influence of geometrically necessary dislocation stress on grain boundary angle during tensile process of stainless steel composite clad plate
LYU Haibo
LI Haibin
YANG Jianhui
WANG Qiang
Abstract：In this study,through tensile testing of clad plates produced with different rolling processes,a theoretical model for the geometrically necessary dislocation stress and grain boundary misorientation in Q235 carbon steel substrate/304 stainless steel clad plates was developed.The relationship between geometrically necessary dislocation stress and grain boundary angles was subsequently calculated.The experimental results indicate that in the tensile sample with a 30%reduction rate,the fraction of low-angle grain boundaries(LAGBs)is33%,while that of high-angle grain boundaries(HAGBs)is 17.8%.For the sample with a 30%/20%reduction rate,the proportion of LAGBs in the carbon steel increased to 72%after tensile testing,while that of HAGBs decreased to 6.1%.When the reduction rate was raised to 35%/20%,the LAGBs further increased to 83%,and the HAGBs decreased to 5.3%.In the clad stainless steel of the same tensile samples,the proportions of LAGBs were measured to be 27%,75%,and 80%,while the corresponding proportions of HAGBs were 41.4%,15.2%,and 10.9%,respectively.As the number of rolling passes and the reduction rate increased,a portion of the high-angle grain boundaries(HAGBs)in the clad plate were transformed into low-angle grain boundaries(LAGBs).
Keywords：carbon steel/stainless steel composite plategrain boundary orientation differencetensile deform-ationgeometrically necessary dislocation stress
Publication Date：2025-09-20
Online Publishing Date：2025-10-28(First online date of this platform, not the publication date of the document)
Pages：6( 15-20 )