胡 銳，劉 林，傅恒志
(西北工業(yè)大學(xué) 凝固技術(shù)國家重點實驗室，西安 710072)
摘 要: 對具有不同枝晶間距的CMSX-2單晶高溫合金的凝固組織特征及其對熱處理組 織和持久性能的影響進(jìn)行了研究。考察了不同溫度下不同枝晶間距組織的固溶情況及熱處理后的組織均勻性，測試了持久性能。結(jié)果表明：隨著凝固組織的細(xì)化，合金的組織均勻性得到提高，從而有效提高了合金的固溶溫度，增大了熱處理均勻化效果；CMSX-2合金鑄態(tài)超細(xì)組織單晶的持久壽命是粗枝晶單晶的1.45倍，熱處理態(tài)超細(xì)枝晶單晶的持久壽命是粗枝晶 單晶的1.85倍。單晶高溫合金組織超細(xì)化是顯著提高合金高溫力學(xué)性能的有效手段。
關(guān)鍵字: 單晶高溫合金；定向凝固；持久性能；熱處理組織；組織細(xì)化
structures and mechanical properties in
single crystal superalloy
ZHANG Feng-shou, HU Rui, LIU Lin, FU Heng-zhi
（State Key Laboratory of Solidification Processing，
Northwestern Polytechnical University，Xi′an 710072，China）
Abstract:The effect of solidified structure characteristics on heat-treated structures and rupture properties was studied in CMSX-2 single crystals with different arm spacing. The results show that，refining of solidified structures enhances the uniform degree of alloy structures，then improves the starting melting temperature of superalloy during solution treatment efficiently. In addition，structure refining can improve effect of heat treatment on rupture properties. The positive effect of superfining of solidified structures on mechanical properties of CMSX-2 superalloy is affirmed sufficiently by the experiment result in which the rupture lives of superfine dendrite single crystals are about 1.45 and 1.85 times those of the coarse dendrite single crystals respectively，in as-cast and heat-treatment condition.
Key words: single crystal superalloy; directional solidification; rupture properties; heat-treated structure; structure refining
