( 1. 中國(guó)科學(xué)院 金屬研究所， 沈陽(yáng) 110016；
2. 沈陽(yáng)黎明航空發(fā)動(dòng)機(jī)(集團(tuán))責(zé)任有限公司， 沈陽(yáng) 110043)
摘 要: 研究返回次數(shù)對(duì)K446合金成分、 組織與力學(xué)性能的影響。 結(jié)果表明： 隨返回次數(shù)的增加， 返回合金的N含量隨之增加， 組織中疏松數(shù)量也隨之增多。 返回次數(shù)對(duì)K446合金高溫?cái)嗔烟卣骱透邷乩煨阅軟](méi)有明顯影響， 但降低持久性能。 通過(guò)控制冶煉過(guò)程并在重熔時(shí)補(bǔ)加適量C、 Al、 Ti等活潑元素， 多次返回合金性能仍高于技術(shù)條件指標(biāo)要求。
關(guān)鍵字: 鎳基高溫合金； 返回次數(shù)； 返回合金； 組織； 力學(xué)性能
LIU Yi-ming2, LI Hong-liang2
（ 1. Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110016, China;
2. Shenyang Liming Aero-Engine (Group) Corporation,
Shenyang 110043, China）
Abstract: The effect of the recycle times on the microstructures and mechanical properties of the revert superalloy K446 were systemically investigated. The results show that the N content increases obviously with the increase of the recycle times of revert alloys, the microporosities content is higher than that of virgin alloy. The recycle times has little effect on the fracture mechanism and tensile properties at high temperature, but reduces slightly the stress-rupture life of revert K446 alloys. The revert K446 alloys after recycled 5 times can be generally used in the casting components by controlling the casting process, because their mechanical properties are higher than those of the standard targets.
Key words: cast nickel-base superalloy; recycle times; revert alloy; microstructures; mechanical properties
