Influence of solidification history on precipitation behavior of TCP phase in a completely heat-treated Ni3Al based single crystal superalloy during thermal exposure

被引：24
作者：
Ai, Cheng [1 ]
Li, Shusuo [2 ]
Zhao, Xinbao [3 ]
Zhou, Jian [2 ]
Guo, Yajie [1 ]
Sun, Zhiping [1 ]
Song, Xuding [4 ]
Gong, Shengkai [2 ]
机构：
[1] Changan Univ, Sch Mat Sci & Engn, Xian 710064, Shaanxi, Peoples R China
[2] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
[3] Xian Thermal Power Res Inst Co Ltd, Xian 710032, Shaanxi, Peoples R China
[4] Changan Univ, Sch Construct Machinery, Xian 710064, Shaanxi, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 722卷
基金：
中国博士后科学基金;
关键词：
Intermetallics; Solidification history; Topologically close-packed phase; TEM; Thermodynamic calculation; CLOSE-PACKED PHASE; NI-BASED SUPERALLOY; WITHDRAWAL RATE; NICKEL; TEMPERATURE; RUTHENIUM; STRESS; SEGREGATION; PARAMETERS; MORPHOLOGY;
D O I：
10.1016/j.jallcom.2017.06.168
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The influence of solidification history on unstressed long-term microstructure stability of TCP in completely heat-treated Mo-rich Ni3Al based single crystal superalloys with cellular and dendritic as-cast microstructures was studied by experimental analysis and the thermodynamic calculation (by JMatPro). High temperature solution treatment can completely eliminate microsegregation of alloying elements in both as-cast cellular and dendritic samples, whereas, the influence of as-cast microstructure (solidification history) on the composition of gamma phase cannot be eliminated by solution treatment: Mo, Cr and Re contents of g phases in as-cast and heat-treated dendritic samples were both higher than those in cellular samples. Meanwhile, as compared with heat-treated cellular sample, higher area fraction of TCP phase in heat-treated dendritic sample was due to higher supersaturation degree of g phase, rather than the difference in the microsegregation behavior of alloying elements. Even so, TCP phases in both longterm aged cellular and dendritic samples were found to be Mo-, Cr-and Re-rich P phases with close compositions. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：740 / 745
页数：6
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