形成测试的 U 隧道被执行调查表面地形学发展热剧降电镀(官方补给) 并且 galvannealed (GA ) 钢和效果死表金属形成上的坚硬(SMF ) 。试验性的结果显示表面粗糙与形成的数字二珍视电镀的钢增加,即,电镀的钢的表面地形学在 SMF 被变粗糙。而且,官方补给的钢比 GA 钢有损坏抵抗的一个更好的能力。地形学发展的机制是官方补给的不同 in the forming of 和 GA 钢。擦伤是表面损坏 in the forming of 的主要形式官方补给的钢。擦伤的严厉能被增加减少死坚硬。GA 钢第一导致涂层的 exfoliating 然后严重的抓。galvannealed 钢的表面地形学能被增加改进死坚硬。然而,坚硬不应该太高。
U-channel forming tests were performed to investigate the surface topography evolvement of hot-dip galvanized(Gl) and galvannealed(GA) steels and the effects of die hardness on sheet metal forming(SMF). Experimental results indicate that the surface roughness values of the two galvanized steels increase with the number of forming, i.e., the surface topographies of galvanized steels are roughened in SMF. Moreover, GI steel has a better ability of damage-resistance than GA steel. The mechanisms of topography evolvement are different in the forming of GI and GA steels. Scratch is the main form of surface damage in the forming of GI steels. The severity of scratch can be decreased by increasing die hardness. GA steel results in exfoliating of the coating firstly and then severe scratching. The surface topography of galvannealed steels can be improved by increasing die hardness. However, the hardness should not be too high.