一、前言某航空发动机中一级导向叶片,K_3材料经固体包埋法渗铝后,在模拟发动机的热冲击试验中,发现在叶盆大小锁板10毫米左右有放射形龟裂,裂纹深入材料基体。事后用各种手段检查,没有发现渗铝层有异常现象。初步分析,龟裂是由于叶片各部位温度场的差异和喷水冷却试验条件恶劣所致。在叶片外形和温度场仍按前所述时,可采用改 I. INTRODUCTION In the thermal shock test of a simulated engine, a first-grade guide vane of aeroengine, K_3 material was aluminized by solid embedding method, and found that radiate fractures of 10 mm or so in the size of the leaf pan lock plate had cracks penetrating deeply Material base. Examine by various means afterwards, have not found the aluminized layer to have the unusual phenomenon. Preliminary analysis, the crack is due to the differences in the temperature field of the blade and spray cooling test conditions caused by poor. In the blade shape and temperature field is still as described above, can be changed