CAJ | 학술논문

通过宏观观察、能谱分析化学成分、金相组织和扫描电镜分析等方法。对某热电厂蒸汽锅炉炉管开裂问题进行研究。结果表明：焊接温度使炉管表面的组织发生了改变，屈氏体使炉管脆化，塑性和韧性降低，变形能力变差。焊接收缩拉应力和其它应力是炉管产生开裂及裂纹扩展的主要原因。
통과굉관관찰、능보분석화학성분、금상조직화소묘전경분석등방법。대모열전엄증기과로로관개렬문제진행연구。결과표명：한접온도사로관표면적조직발생료개변，굴씨체사로관취화，소성화인성강저，변형능력변차。한접수축랍응력화기타응력시로관산생개렬급렬문확전적주요원인。
The steam boiler tube cracking problem in a power plant was analyzed by macro observation, chemical composition analysis, optical and electron microstructure observation, energy dispersive X-ray spectroscopy (EDS) analysis and scanning electron microscopy analysis. The results showed that: the tissue of furnace tube surface was changed by welding process, the formation of troostite embrittled the furnace tube, lowered its ductility and toughness to deteriorate the deformation capacity;Weld shrinkage tensile stress and other stress were the main reasons for tube cracking and cracks propagation.