一、问题的提出 我厂从1969年开始试制涡桨型发动机,该发动机涡轮部分的高压、中压涡轮工作叶片,高压涡轮导向叶片等六种叶片毛坯都是采用K3镍基铸造高温合金精密铸造的。 K3镍基铸造高温合金中,有许多价格昂贵的合金元素(如Ni、Cr、Co、Mo、W等),其中Ni占70％,Cr约占10％,Co、Mo、W各占50％左右,主要元素镍是从国外进口的。 长期以来,特别是1973年涡桨型发动机转入批生产后,精铸车间堆积的K3合金回炉料 First, the issue put forward I plant from 1969 to trial production of turboprop engines, the engine part of the turbine high-pressure, medium-pressure turbine working blades, high-pressure turbine guide vane and other leaf blanks are used K3 nickel base cast superalloy casting of. There are many expensive alloying elements (such as Ni, Cr, Co, Mo, W, etc.) in K3 Ni-base superalloy, among which Ni accounts for 70%, Cr accounts for 10%, Co, Mo and W account for 50% Around, the main element of nickel is imported from abroad. For a long time, especially after the conversion of the turboprop engine into batch in 1973, the K3 alloy piled up in the casting shop