某加热器螺旋管泄露的原因
Reason for Leakage of a Heater Spiral Tube
摘 要
某加热器螺旋管在运行过程中发生泄露，通过宏观形貌和显微组织观察、化学成分分析、扫描电镜和能谱等方法研究了其泄露原因。结果表明：螺旋管发生蠕变开裂，开裂形式为脆性沿晶开裂；由于服役温度过低，该螺旋管焊接热影响区中沿晶界析出片线状碳化物，使得其附近形成贫铬区；在弯曲应力、振动应力和焊接残余应力作用下，碳化物周围出现较多空洞缺陷，空洞扩展长大而形成裂纹，导致泄露。
泄露
高温蠕变
碳化物
spiral tube
leakage
high temperature creep
carbide
Abstract
The spiral tube of a heater leaked in operation. The cause of the leakage was analyzed by macromorphology and microstructure observation, chemical composition analysis, scanning electron microscopy, energy disperse spectroscopy, and so on. The results show that creep cracking occurred in the spiral tube, and the cracking form was brittle intergranular cracking. Because of the low working temperature, flake carbides precipitated on grain boundaries of the welding heat-affected zone of the spiral tube, causing the formation of chromium-depleted zones nearby. Under the bending stress, vibration stress and welding residual stress, many cavitation defects formed around the carbides, and the cavitation expanded and grew, forming cracks and finally leading to leakage.
中图分类号 TG142 DOI 10.11973/jxgccl202102018
所属栏目 失效分析
基金项目
收稿日期 2020/3/11
修改稿日期 2020/11/16
网络出版日期
作者单位点击查看
备注蒋桥红(1994-),女,广西桂林人,硕士研究生
引用该论文: JIANG Qiaohong,BA Fahai. Reason for Leakage of a Heater Spiral Tube[J]. Materials for mechancial engineering, 2021, 45(2): 102～105
蒋桥红,巴发海. 某加热器螺旋管泄露的原因[J]. 机械工程材料, 2021, 45(2): 102～105
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参考文献
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