炼厂燃油锅炉屏式过热器管失效分析  

Failure Analysis of Platen Superheater Tube of Fuel-oil Boiler

作　　者：莫烨强 罗建成 孙亮 侯艳宏 

机构地区：[1]沈阳中科韦尔腐蚀控制技术有限公司,沈阳110180 [2]中海炼化惠州炼油分公司,广东惠州516086

出　　处：《失效分析与预防》2014年第5期280-282,共3页Failure Analysis and Prevention

摘　　要：采用宏观观察、金相观察、扫描电子显微分析、成分分析等分析方法,对燃油锅炉屏式过热器发生开裂失效原因进行了分析研究。结果表明:该管长期在高温下运行产生了蠕变现象;珠光体组织出现严重的球化现象,大量碳化物呈链状沿晶界析出;过热器管道内壁存在约371.55μm厚度的氧化层。因此,管束长期局部过热服役,致使金相组织发生改变,大大降低了材料的力学性能,从而发生蠕变开裂现象。The failure reasons of a platen superheater tube of a fuel-oil boiler were studied by macroscopic observation, metallographic analysis, scanning electron microscopy （ SEM ） and energy dispersive spectroscopy （ EDS ） . The result of macroscopic observation shows that creep cracking happened to the tube after working for a long time at high temperature. The result of metallographic analysis shows that the carbide precipitated at grain boundaries. The result of scanning electron microscopy（ SEM） and energy dispersive spectroscopy（ EDS） show that a oxidation layer formed on the inside of the tube. The thickness of the oxidation layer was 371. 55μm. It can be concluded that long-term local overheating occurred to the tube during working, leading to microstructure change and reducing the mechanical properties of the material.

关 键 词：12CR1MOV 过热器 开裂 失效 蠕变 

分 类 号：TE62[石油与天然气工程—油气加工工程] TH49[机械工程—机械制造及自动化]