面向盾构机密封跑道修复的激光熔覆Fe基涂层制备工艺
Heat Treatment of Metals（2022）
Abstract
为探究激光熔覆再制造修复工艺对盾构机密封跑道磨痕的修复效果,采用送粉式激光熔覆工艺在42CrMo钢基体表面制备了Fe55铁基自熔合金涂层.基于L16(43)正交试验探究了激光功率、熔覆速率和搭接率对涂层表面形貌、横截面特征参数、稀释率、显微组织、硬度的影响规律和作用机理.极差分析表明,稀释率随激光功率和熔覆速率的增加均呈上升趋势,其中激光功率对涂层硬度影响最大,最大涂层硬度约为基体硬度的2.15倍.Fe55涂层的摩擦因数较基体明显降低,涂层耐磨性优良,其磨损体积较基体降低1.09×10-2 mm3,主要磨损机制为磨粒磨损和疲劳磨损.
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