K488合金大尺寸涡轮叶片精铸工艺研究
Metallic Functional Materials(2012)
Abstract
大尺寸涡轮叶片是重型燃气轮机的关键核心部件,采用铸造高温合金K488无余量精密铸造而成,该叶片结构复杂,叶身尺寸大,壁厚薄,尺寸精度高,冶金技术标准要求严格,铸造工艺难度很大。设计采用了蜡模二次成型、反变形技术、顶注-侧注复合浇注系统的优化,解决了铸造过程中产生的疏松、裂纹、变形等缺陷,研制出了合格的大尺寸涡轮叶片。
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Key words
turbine bucket,composite casting,high-temperature alloy
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