摘要：某热电装置CFB屏式锅炉过热管发生了开裂失效。通过断口宏观和微观形貌及显微组织观察、化学成分检测、金相分析及能谱分析等方法，对过热管开裂失效原因进行了分析和研究。分析结果表明，过热管的开裂破坏是在材料韧性下降的情况下，由于管子表面受损应力增加及表面裂纹引起的应力集中所造成的脆性断裂。
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