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研究了铸造尺寸效应和加工尺寸效应对铸造高温合金Ｋ４１７Ｇ高温性能的影响，结果表明、未经机械加工的Ｋ４１７Ｇ合金薄壁试样的高温持久性能与标准试样相当，无薄壁效应；而经大余量机械加工得到的薄壁试样，其高温持久性能下降，有薄壁效应有效承载截面上显微疏松增多和横向晶界易于滑移开裂是造成经大余量机械加工得到的等轴晶薄壁样品高温持久性能下降的主要原因
The effects of casting size effect and size effect on the high temperature performance of the foundry superalloy K417G were studied. The results show that the non-machined K417G alloy thin-walled specimen has the same high-temperature durability as the standard specimen with no thin-wall effect. Large allowance machining thin-walled samples, the high temperature performance of long-term decline, with thin-walled effective load-bearing cross-section increased micro-loosen and transverse grain boundary easy to slip cracking is caused by the large allowance machining isometric Crystalline thin-walled samples of high temperature performance of the main reasons for the decline