回转窑筒体开裂的失效分析  

Failure Analysis on Rotary Kiln Cylinder Cracking

作　　者：马小明[1] 闫莉丹 MA Xiaoming;YAN Lidan(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《热加工工艺》2022年第12期151-155,共5页Hot Working Technology

摘　　要：针对某回转窑在停窑整修期间发生筒体开裂失效的情况,通过宏微观形貌观察、化学成分分析、力学性能测试、金相组织分析、荧光检测及XRD分析等方法,对开裂筒体进行取样,总结了筒体开裂失效原因。结果表明,窑内腐蚀性物质对筒体内壁的局部腐蚀是导致筒体壁厚减薄产生微裂纹的主要原因;近窑头母材中S、P元素形成的带状组织在受力时易发生变形,是致使材料性能下降的重要原因;停窑整修时遇到低温环境条件使得筒体材料脆性显著增加,促进了筒体的脆性断裂。In view of the cracking and failure of the cylinder in a rotary kiln during the shutdown and renovation, the cracked cylinder was sampled by means of macro and micro morphology observation, chemical composition analysis,mechanical property test, metallographic structure analysis, fluorescence detection and XRD analysis, and the reasons for the cracking and failure of the cylinder were summarized. The results show that the local corrosion of the inner wall of the cylinder by corrosive substances in the kiln is the main reason for the microcrack caused by the thinning of the inner wall of the cylinder. The banded structure formed by S and P elements in the base material near the kiln head is prone to deform under stress, which is an important reason for the deterioration of material properties. The low temperature environment increases the brittleness of the cylinder material significantly and promotes the brittle fracture of the cylinder.

关 键 词：回转窑 筒体开裂 腐蚀 

分 类 号：TG111.91[金属学及工艺—物理冶金]