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요약정보
高温合金单晶铸件中杂晶缺陷的试验研究 / Experimental Investigations on Stray Grain Defects in Single Crystal Castings of Superalloys
Resource Type
Academic Journal
Authors
马德新
;
王富
;
孙洪元
;
徐维台
;
MA De-xin
;
WANG Fu
;
SUN Hong-yuan
;
XU Wei-tai
Source
铸造 / Foundry
. 68(6):558-566
Subject
高温合金
杂晶缺陷
定向凝固
单晶叶片
精密铸造
Language
Chinese
ISSN
1001-4977
Online Access
Scopus
Find it @ DONGA
초록
分析了高温合金单晶叶片铸件中杂晶缺陷的特征和形成机理.指出杂晶主要产生在铸件横截面大幅度扩张的部位,如缘板和叶冠处,原因是边角处冷却过快,熔体过冷超过了合金的临界形核过冷度.通过试验验证了叶片形状、凝固工艺和合金过冷能力等因素的影响,并提出了这种几何性杂晶形成的条件判据.在生产试验中还发现杂晶也会由其他原因引起,如在型壳内壁的裂纹处和型壳与芯头的间隙中,浇注时渗入的金属液在凝固时形成杂乱晶向的金属披缝,有可能长入铸件形成杂晶.另外,铸件在定向凝固中若产生雀斑缺陷,则雀斑链中的细小等轴晶粒可能会继续生长,扩展为粗大的杂晶组织.条纹晶也可发展成为三维的大尺度杂晶缺陷,但与基体的晶向偏离不会太大.
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