长期以来,Ⅱ级涡轮叶片叶盆型面与榫头转接R处规律地产生横向裂纹,导致叶片报废。这样,不仅浪费了大量的价格昂贵的GH49合金,而且严重地影响了装机使用。为此,探讨Ⅱ级涡轮叶片横向裂纹产生原因并采取相应的工艺措施,便成为一项急待解决的技术课题。通过一年来多次探讨和试验,基本弄清了产生横向裂纹的根本原因,从而使这一技术课题较好地获得了解决。 For a long time, the horizontal turbine blade leaf surface and the tenon transfer R regularly produce transverse cracks, leading to blade scrapping. In this way, not only was the waste of a large number of expensive GH49 alloys, but also seriously affected the installed capacity. Therefore, it is an urgent technical issue to study the cause of horizontal cracks in Grade II turbine blades and to adopt corresponding technological measures. After many discussions and experiments over the past year, we have basically found out the root causes of horizontal cracks and solved the technical problems better.