• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Engineering and Performance >Oil-Ash Corrosion Resistance of Dissimilar T22/T91 Welded Joint of Super Heater Tubes
【24h】

Oil-Ash Corrosion Resistance of Dissimilar T22/T91 Welded Joint of Super Heater Tubes

机译：过热器T22 / T91异种焊接接头的耐油灰腐蚀性能

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

The studies on the high temperature corrosion of the dissimilar metal weldment are necessary for longer service of the weldments in corrosive medium. This paper reports the performance of microstructurally different regions, namely heat-affected zone (HAZ), weld metal (WM), and base metal (BM) of dissimilar metal weldment of T22/T91 in the molten salt (Na2SO4-60%V2O5) environment under cyclic studies. The T22 HAZ, WM, and T91 HAZ were observed to oxidize at higher rates and develop more scale thickness than other regions in the weldment. Microstructures and elemental analysis indicate lesser availability of Cr in T22 HAZ and T91 HAZ due to formation of Cr-rich phases, which ultimately causes the difference in oxidation behavior of different regions. The presence of chromium carbides and intermetallics in un-oxidized T22 HAZ region and martensitic structure with the presence of delta ferrites in un-oxidized T91 HAZ region was observed to be the major cause behind the weak corrosion resistance of the respective HAZs. The higher oxidation rate of T22 HAZ may be attributed to the absence of protective scale of Cr2O3 and presence of Fe3O4 phases. Similarly higher oxidation rate of T91 HAZ region can be attributed to lesser availability of Cr due to the propensity of development of delta ferrite in martensitic structure.
机译：对异种金属焊件的高温腐蚀的研究对于在腐蚀介质中延长焊件的使用寿命是必要的。本文报告了在熔融盐（Na2SO4-60％V2O5）中T22 / T91的异种金属焊件的微观结构不同区域（即热影响区（HAZ），焊缝金属（WM）和贱金属（BM））的性能循环研究的环境。与焊件中的其他区域相比，观察到T22 HAZ，WM和T91 HAZ的氧化速率更高，并且产生的氧化皮厚度更大。微观结构和元素分析表明，由于富铬相的形成，T22 HAZ和T91 HAZ中Cr的可用性较低，这最终导致不同区域氧化行为的差异。观察到在未氧化的T22 HAZ区中存在碳化铬和金属间化合物，在未氧化的T91 HAZ区中存在马氏体组织，以及δ铁素体的存在是造成各个HAZ耐腐蚀性较弱的主要原因。 T22 HAZ的较高氧化速率可能归因于缺乏Cr2O3的保护性氧化皮和Fe3O4相的存在。同样，由于马氏体组织中δ铁素体的发展倾向，T91 HAZ区域较高的氧化速率可归因​​于Cr的可用性较低。

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