METALS AND MA'fFRIALS Vol. 2, No. 3 (1996), pp. 133-.140 Prediction of Inhomogeneous Texture in Clad Sheet Metals: by Hot Roll Bond Method Shi-Hoon CHOI, Jae Wook KWON* and Kyu Hwan OH School of Materials Science and Engineering and Center for Advanced Material.,, Research. Seoul National University, 56-1 Shinrim-dong, Kwanak-ku, Seoul 151-742, Korea *Institute for Advanced Engineering, C.P.O. Box 2849. Seoul, Korea A finite element analysis was applied to analyze .'he evolution of an inhomogeneity nt rolling texture in hot rolled clad metal with Taylor-Bishop-Hill model and Renourd-Winterberger method "l-he shear texture has been developed in the surface layer of the aluminum and plane strain texture has been developed m the c,.'nt- er layer. The calculaled texture variations through thickness direction could simula:e experimental texture us- ing deformation gradient from FEM. l"he ratio of shear strata to rolling strain, x, v,hich represents the de- gree of rotatio~ ;ibout transverse direction could give the degree of development cf shear texture. The larger value of x gi,,cs the lamer crystal rotation about transverse direction and subsequently the developme~.t of shear texture The caloulatexl (Ill) pole figures v,ere in good agreement with experimentally measured pole figures. I. INTRODUCI'ION Stainless steel clad aluminum sheet metai(STS430/AI) have the very good corrosion-resistant and mechanical properties of stainless steel and the excellent thermal and electrical conductiv~ties of aluminum. Hot roll bond- ing method has been mainly u~d fi~r manufacturing of clad sheet metals !1 i. Several analyses have been canied out to analyze the deformation mechanism during bond- ing of clad sheet metals by slab analysis [2, 3, 4]. These analyses assumed the homogeneous deformation along the thickness direction. However, the texture of alu- minum in clad sheet metal has been observed to var~ :t- long the thicloless direction due to the inhomogeneous deformation during rolling. No study has been repotted to analyze evoluti.~n of texture in clad sheet metal. But many studies focussed on the texture of monolithic sheet during rolling [5, 6, 7 I. The inhomogeneity of texture during rolling of monolithic shee,, is attributed mainly ~o the formation of shear texture at the surface of the rolled material. It has been found that the parameters of rolling process and the mechanical properties of sheet play an important role in the formation of shear texture and its penetration into the rolled sheet. Dillamore and Roberts found that the depth of penetration of the shear texture increases as the friction coefficient increases 151. Truszkowski et al. she,wed that the inhomogenelty ~f texture through thickness d|rection is dcpt:ndent on I/d parameler. ~herc I is the projected length o::' contact sur- face between the roll and sheet, and d is the sheet thick- ness [6]. The temperature and stacking fatth energy of the material could also affect the formation of in- homogeneous texture. For the rolling of fcc metals, the shear components have been frequently found in the sur- face laver .3f rolled sheet. These co,nponents were characterized by major {100}<011> and minor {111} <!12> and {111}<110>. Kamijo r al. found that the main component of shear texture in the surface of hot- rolled AI-Mg alloy could be described as {1 !1}<110> orientation !7]. These shear comlx~nents have been theoretically obtained by many investigators [8, 9]. in their calculations, they assumed thal the ratio of shear strain to rolling strain component is constant. However, during the r0dling proce~% the ratio of shear to normal strain component is not constant. In ordt'r to predict more preci~ly the texture evolution durin~i rolling, the history of deformation gradient tensor should be cal- culated. The history of deformation gradient tensor could be obtained by the finite element analysis [10, 11]. Mathur et al used the rate dependent constitutive model to develop an Eulerian finite element procedure to simu- late the evolution of crystallographic texture in steady state hulk fl~rming processes. Recently. Kalidini et al. predicted the evolution of cystallographic texture in fcc