混凝土输送管失效分析及改进工艺研究
Study on Failure Analysis and Process Improvement of Concrete Duct
杨 浩, 李 聪, 元 敏, 陈汪林
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作者单位：(湖南大学 材料科学与工程学院, 湖南 长沙 410082)
中文关键字：混凝土输送管； 耐磨性能； 显微组织； 电火花沉积； 堆焊
英文关键字：concrete duct; wear-resistance; microstructure; electrical sparkle deposition; bead weld
中文摘要：采用显微硬度计和显微镜对磨损失效的混凝土输送管进行力学性能测试及显微组织表征。结果表明：输送管连接处相对于其他位置更易受到强烈的磨粒磨损而失效。对输送管连接处进行电火花沉积WC及堆焊Co表面强化处理后，输送管连接处的表层组织细小、均匀，其耐磨性能得到较大提高。
英文摘要：The microstructure and mechanical properties of concrete duct were studied using micro-sclerometer, SEM and OM. The results show that the conjuctions are much easilier disabled by grain-abrasion than the other places of the concrete duct. After treated by electrical sparkle deposition of WC and bead weld of Co, respectively, the microstructure of surface layer is much smaller and well-distributed，and the wear resistance improves.