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用扫描电子显微镜（ＳＥＭ）对ＰＣ钢棒生产中产生的脆性断裂断口进行了分析．研究了断裂机理，找出了发生断裂的原因，指出了解决问题的方法。
The fracture of brittle fracture produced in the production of PC steel bars was analyzed by scanning electron microscopy (SEM). The fracture mechanism was studied, the reason of fracture was found out, and the method to solve the problem was pointed out.