| Invar alloy has been extensively used for shadow mask of color television and computer monitor because of its low thermal expansion coefficient, but the processing technologies of invar alloys for shadow mask have not been well known. To find out the unknown manufacturing process of invar alloys for shadow mask, variations in mechanical properties with cold reduction ratio and annealing temperature were investigated. Also, the relationships between etching properties and texture in invar alloys were investigated by applying the newly developed texture analysis technique, EBSD. The final cold reduction ratio in the invar alloys was found to be about 25 percent while the cold reduction ratio above 60 percent was needed for the good etching properties in the low carbon Al-killed steel. It was suggested that because {001} grains in the surface of invar alloys had high angle grain boundaries, the more the uniform-distributed {001} grains in the surface, the etchability was improved. When the cold-rolled invar alloys were annealed, the etchability was deteriorated by both more inhomogeneous distribution of coarse {001} recrystallized grains and the increase in high angle grain boundaries with misorientations above 40˚ |
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