帮助 关于我们

返回检索结果

激光立体成形镍基单晶高温合金显微组织研究
Microstructures of Nickel-base Single-Crystal Superalloy Prepared by Laser Solid Forming

查看参考文献24篇

文摘 采用激光立体成形(Laser Solid Forming,LSF)技术制备了一种镍基单晶高温合金,对沉积态和热处理态试样进行了显微组织观察。结果表明,沉积态单晶高温合金试样中下部为二次枝晶不发达的微细枝晶,一次枝晶间距随试样高度的增大而略有增加;试样的顶部存在转向枝晶层。枝晶间均匀弥散分布着类圆形显微疏松和小块状MC型碳化物。透射显微镜观察可知,沉积态试样γ基体中分布着大量纳米级γ'颗粒。沉积过程中累积的残余应力在y基体中萌生了位错,并推动了位错滑移,致使一些位错在γ基体通道中发生缠结,有些位错甚至切入γ'。进行固溶+两级时效热处理后,试样发生了完全再结晶,再结晶晶粒大小极度不均匀,有些再结晶晶粒中还存在孪晶。热处理后,LSF试样中γ'析出相的尺寸分布与传统铸造合金热处理后相似。
其他语种文摘 Single-crystal superalloys have been commonly used in modern advanced aero engines to produce high-pressure high-temperature turbine blades. In order to extend the lifetime of single-crystal turbine blades, repair of cracked and worn ones is of great interest. Laser Solid Forming (LSF) is a prospective technology that can be used to repair single-crystal blades. In this study, the microstructure of the as-deposited and heat-treated LSF single-crystal superalloy has been characterized through optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The as-deposited LSF sample shows a directionally solidified columnar dendrites growing almost parallel to the building direction. Between the dendrites, nearly round microporosity and blocky MC carbide particles are dispersed uniformly. TEM results indicate that many nano γ' particles precipitate in γ matrix. In addition, during LSF deposition process, stress is formed,which generates plenty of dislocations. During heat treatment,the LSF sample experiences full recrystallization. The recrystallization grains are in different sizes, and twins are found in some recrystallized grains. Because the residual stress is fully released during heat treatment, the size and shape of γ' precipitates in the recrystallized and un-recrystallized regions are similar to those in conventionally cast samples.
来源 稀有金属材料与工程 ,2017,46(12):3753-3759 【核心库】
关键词 激光立体成形 ; 单晶高温合金 ; 热处理 ; 再结晶
地址

中国科学院金属研究所, 辽宁, 沈阳, 110016

语种 中文
文献类型 研究性论文
ISSN 1002-185X
学科 金属学与金属工艺
基金 国家自然科学基金 ;  国家863计划
文献收藏号 CSCD:6136821

参考文献 共 24 共2页

1.  Mokadem S. Metall Mater Trans A,2007,38:1500 被引 8    
2.  Vilar R. Adv Mater Res,2011,278:503 被引 1    
3.  Vilar R. Acta Mater,2009,57:5292 被引 14    
4.  黄卫东. 激光立体成形,2007 被引 40    
5.  黄卫东. 稀有金属材料与工程,2005,34(3):543 被引 3    
6.  Vilar R. J Laser Appl,2015,27:S17004 被引 8    
7.  Yang S. Acta Mater,2002,50:315 被引 11    
8.  Gaumann M. Mater Sci Eng A,1999,271:232 被引 82    
9.  Gaumann M. Acta Mater,2001,49:1051 被引 113    
10.  Liu W P. Acta Mater,2005,53:1545 被引 7    
11.  Liu Z Y. Metall Mater Trans,2014,45:1903 被引 1    
12.  Liu Z Y. Acta Mater,2015,87:248 被引 6    
13.  Liu Z Y. J Mater Process Technol,2015,216:19 被引 3    
14.  王华明. 金属学报,1991,27:403 被引 2    
15.  王华明. 金属学报,1991,27:92 被引 2    
16.  王理林. 激光重熔熔池凝固组织的实时观察研究. 金属学报,2015,51:492 被引 5    
17.  Santos E C. Adv Mater Res,2012,418/420:1564 被引 2    
18.  Jiang M. Mater Lett,1989,7:449 被引 1    
19.  Felberbaum L. Mater Sci Eng A,2001,299:152 被引 9    
20.  Chen J Y. Mater Sci Engin A,2010,527:7318 被引 3    
引证文献 3

1 潘爱琼 镍基单晶高温合金选区激光熔化成形工艺及组织 中国激光,2019,46(11):1102007
被引 0 次

2 张雪 扫描路径对激光立体成形GH3536合金显微组织与拉伸性能的影响 稀有金属材料与工程,2021,50(9):3225-3232
被引 1

显示所有3篇文献

论文科学数据集
PlumX Metrics
相关文献

 作者相关
 关键词相关
 参考文献相关

版权所有 ©2008 中国科学院文献情报中心 制作维护:中国科学院文献情报中心
地址:北京中关村北四环西路33号 邮政编码:100190 联系电话:(010)82627496 E-mail:cscd@mail.las.ac.cn 京ICP备05002861号-4 | 京公网安备11010802043238号