30Cr1Mo1V高压转子缺陷分析

Defect Analysis of 30Cr1Mo1V High Pressure Rotor

针对30CrlMo1V高压转子精加工中发现多处缺陷,解剖缺陷部位,采用扫描电镜能谱分析,发现缺陷源自夹杂物。分析冶炼过程发现心部缺陷主要有Al_(2)O_(3)、SiO_(2)和CaO夹杂,以Al_(2)O_(3)含量最高,推测是二次氧化导致;裂纹缺陷中的夹杂物主要为ZrO、CaO、Al_(2)O_(3),结合中间包和导流管耐火材料成分,认为大裂纹源自中间包受侵蚀形成的夹杂物,小裂纹则源自导流管受侵蚀形成的夹杂物。

In view of multiple defects found during finishing machining of 30Cr1Mo1V high pressure rotor,defect areas of the rotor are cut for SEM energy spectrum analysis and have found that the defects are caused by inclusions.Analysis of the smelting process has revealed that defects at core areas are mainly caused by Al_(2)O_(3),SiO_(2) and CaO inclusions,with Al_(2)O_(3) having the highest content(supposedly caused by secondary oxidation);inclusions in the crack defects are mainly ZrO,CaO and Al_(2)O_(3),by considering composition of the tundish and refractory of the guide tube assembly,it is believed that big cracks are caused by inclusions from erosion of tundish,and small cracks are caused by inclusions from erosion of guide tube assembly.