...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Characterization >Failure of 2.25Cr-lMo steel superheater tubes in a fluidized bed combustor due to fireside corrosion
【24h】

Failure of 2.25Cr-lMo steel superheater tubes in a fluidized bed combustor due to fireside corrosion

机译：流化床燃烧室中2.25Cr-lMo钢过热器管由于炉边腐蚀而失效

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Repeated failures have been observed in a few superheater tubes made of 2.25Cr-1Mo steel at a localized region in a circulating fluidized bed combustion boiler. This paper reports the failure analysis of two affected tubes — the ruptured part of a failed tube and another tube with localized thinning in one region. Both the tubes had grayish, thick and hard deposits of calcium sulphate on the outer diameter surfaces beneath which thick oxide layer was present. A number of intergranular cracks and internal penetration of oxides along the grain boundaries in the base material were observed emanating from the oxides present on the fireside of the tubes. The longitudinal surface adjacent to the failed region showed typical features of intergranular creep. The primary reason of the failure was the continuing thinning of the tubes caused by the alternate cycle of formation of thick calcium sulphate deposit on the fireside of the tubes and its spallation. The spallation of calcium sulphate deposits occurred along with the metal oxide leading to the exposure of the bare material. This caused rapid growth of the less protective outer oxides on the base material. Intergranular creep led to the final rupture of the tube caused by increase in the hoop stress due to the thinning of the tube.
机译：在循环流化床燃烧锅炉的局部区域中，在由2.25Cr-1Mo钢制成的一些过热器管中观察到了重复的故障。本文报告了两个受影响的管的失效分析-一个失效管的破裂部分和另一个在一个区域局部变薄的管。两个管在外径表面上均具有浅灰色，厚而硬的硫酸钙沉积物，在其下方存在厚的氧化物层。观察到许多晶粒间的裂纹和氧化物沿基体材料中的晶界内部渗透，这是由于存在于管的火侧的氧化物所致。邻近失效区域的纵向表面显示出晶间蠕变的典型特征。失效的主要原因是由于在管子的火面上形成浓硫酸钙沉积物的交替循环以及其散裂而导致管子继续变薄。硫酸钙沉积物的剥落与金属氧化物一起发生，导致裸露的材料暴露出来。这导致保护性较差的外部氧化物在基材上快速生长。晶间蠕变导致管的最终破裂，这是由于管变薄导致环向应力增加而引起的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号