Effect of Al2O3 Inclusions or Mold Flux Particles on Their Surrounding Microstructures of Sliver Defects on the Surface of Automobile Exposed Panel

The Al2O3 inclusions and mold flux particles are the initial causes of sliver defects on surface automobile exposed panels. During rolling process, smashed or will hinder growth recrystallized grains. Compared with particles, have a smaller size, denser distribution, larger number density, so stronger ability to grain boundary migration. Therefore, average size is small in following sequence: defect zone (Al2O3 DZ Al2O3), (MFDZ MFP), without non-defect (NDZ). influence orientation zones results microtexture {111}<313>, which close {111}<101> microtextures NDZ MFDZ MFP, while {001}<114> {313}<111> MFP quite different from that NDZ. Due differences inclusions, orientation, NDZ, dark-gray bright white panel eventually formed.