高温合金定向凝固技术研究进展  

Advances in Directional Solidification Techniques of Superalloys

作　　者：刘林[1] 张军[1] 沈军[1] 黄太文[1] 傅恒志[1] 

机构地区：[1]西北工业大学,陕西西安710072

出　　处：《中国材料进展》2010年第7期1-9,41,共10页Materials China

基　　金：国家自然科学基金资助项目(50771081;50827102;50931004);科技部973计划项目(2006CB605202;2010CB631202);科技部863计划项目(2007AA03Z552)

摘　　要：首先回顾了定向凝固的发展历史,重点分析了液态金属冷却定向凝固的技术特点。总结了高温度梯度下制备的定向凝固法单晶高温合金在组织和性能方面的研究现状,结合作者在本领域的研究,着重分析了定向凝固温度梯度、凝固速率、晶体取向、熔体超温处理、熔体对流控制对组织和性能的作用规律和机制,认为高温度梯度定向凝固是细化组织、减少缺陷、提高合金性能的重要途径。最后展望了高温合金定向凝固的发展趋势。This paper first reviews the history of the development of directional solidification, focusing on analysis of liquid metal cooled directional solidification characteristics. We summarize solidification microstructure and mechanical properties of selected directionally solidified and single crystal superalloy prepared under high thermal directional solidification with author＇s research features in this field. The effects of thermal gradient, solidification rate, crystal orientation, melt-superheating and melt convection on the microstructure and mechanical properties of superalloys were analyzed. We conclude that the high thermal gradient directional solidification is an important way to refine the microstructure, reduce defects, and im- prove performance of superalloys. Finally, the future trends directional solidification of superalloys was prospected.

关 键 词：定向凝固 高温合金 凝固组织 持久性能 

分 类 号：TG111.4[金属学及工艺—物理冶金]