TP304H奥氏体锅炉管高温运行显微特征
Microstructure of TP304H Austenitic Boiler Tubes Operated at High Temperatures
摘 要
对某电厂高温运行62000 h的1021 t/h锅炉用TP304H奥氏体不锈钢屏式过热器夹持管弯头部分取样,进行金相检验、力学性能分析和微区能谱分析等试验分析,研究了粗晶奥氏体不锈钢过热器长时间高温运行时材料的微观结构特征.研究结果表明:锅炉管运行时的腐蚀介质、壁温以及运行应力对材料微观结构影响较大.烟气侧腐蚀程度比蒸汽侧严重,从烟气侧向蒸汽侧壁厚方向,材料晶间腐蚀程度先由强到弱,管壁中间最弱,然后晶间腐蚀程度又逐渐略为加重.
晶间腐蚀
应力腐蚀裂纹
奥氏体不锈钢
TP304H钢
cold forming
intergranular corrosion
stress-corrosion crack
austenitic stainless steel
TP304H steel
Abstract
Investigations of bend TP304H tube in an 1021 t/h boiler which operated at high temperature for 62000 h was carried out by means of metallurgic inspection,energy dispersive X-ray (EDX) and other tests.The microstructure and morphology features of TP304H austenitic stainless steel tube operated at high temperature for long time were investigated.The results showed that corrosive media,tube wall temperature and stress had great influence on microstructure of TP304H tube.Intergranular corrosion in the gas side was more severe than that in the steam side.From the steam side to the gas side along the wall direction the intergranular corrosion weakened firstly,and reached the lightest in the middle of the wall,and was intensified slightly then.
中图分类号 TG172.8
所属栏目 试验研究
基金项目
收稿日期 2009/9/14
修改稿日期 2009/10/9
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联系人作者龙会国(sivylon@163.com)
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引用该论文: LONG Hui-guo,LONG Yi,CHEN Hong-dong. Microstructure of TP304H Austenitic Boiler Tubes Operated at High Temperatures[J]. Corrosion & Protection, 2010, 31(8): 627～630
被引情况:
【1】龙会国,谢国胜,龙毅,李登科, "T23钢管蒸汽侧氧化层的微观结构及形成机理",机械工程材料 38, 42-45(2014)
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参考文献
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【5】赵彦芬,何卫忠,赵林松,等.冷加工对高温运行奥氏体锅炉管的影响[J].中国电力,2008,39(6):41-44.
【6】刘业雄.1025 t/h直流锅炉前屏过热器夹持管爆漏原因分析[J].锅炉技术,2003,34(3):70-73.
【7】张德康.不锈钢的局部腐蚀[M].北京:科学出版社,1982.
【8】杨厚君,李正刚,李朝志,等.DG1025锅炉高温再热器高温腐蚀原因分析与防止措施[J].中国电机工程学报,2003,23(11):211-214.
【9】张堃,黄镇宇,修洪雨,等.煤灰中化学成分对熔融和结渣特性影响的探讨[J].热力发电,2005,34(12):27-30.
【10】董红年.高温过热器管硫腐蚀损坏试验研究[J].陕西电力,2006,34(4):33-36.
【11】兰泽全,曹欣玉,周俊虎,等.燃煤锅炉灰沉积物形成过程及机理综述[J].锅炉技术,2008,39(5):28-32.
【12】李美栓.金属的高温腐蚀[M].北京:冶金工业出版社,2001.
【13】边彩霞,周克毅,胥建群,等.锅炉过热器蒸汽侧氧化膜瞬态应力的有限元分析[J].动力工程,2008,28(5):696-700.
【14】郑晓红,赵翔,曹欣玉,等.过热器弯管段有限元分析剩余寿命[J].锅炉技术,2004,35(1):32-35.
【15】ASTM SA213/213M-07a.Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler,Superheater,and Heat-Exchanger Tubes[S].
【16】Bernard S,CovinoJ R,James H Russell,et al.The role of ash deposits in the high temperature corrosion of boiler tubes[C]//Corrosion 2003,Houston:NACE International,2001:3718-3730.
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