In addition, the notch sensitivity caused by the low ductility at middle temperature and the brittle tendency after long tirne service also may result in frac-ture of disk rim.

• 此外,中温低塑性所引起的缺口敏感性及长期使用后轮缘部位的脆化倾向也会导致涡轮盘发生轮线断裂。