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金属学报  2012, Vol. 48 Issue (7): 845-852    DOI: 10.3724/SP.J.1037.2012.00001
  论文 本期目录 | 过刊浏览 |
Re和Ru对镍基单晶高温合金组织偏析的影响
刘刚, 刘林, 张胜霞, 杨初斌, 张军, 傅恒志
西北工业大学凝固技术国家重点实验室, 西安 710072
EFFECTS OF Re AND Ru ON MICROSTRUCTURE AND SEGREGATION OF Ni-BASED SINGLE-CRYSTAL SUPERALLOYS
LIU Gang, LIU Lin, ZHANG Shengxia, YANG Chubin, ZHANG Jun, FU Hengzhi
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072
引用本文:

刘刚 刘林 张胜霞 杨初斌 张军 傅恒志. Re和Ru对镍基单晶高温合金组织偏析的影响[J]. 金属学报, 2012, 48(7): 845-852.
, , , , , . EFFECTS OF Re AND Ru ON MICROSTRUCTURE AND SEGREGATION OF Ni-BASED SINGLE-CRYSTAL SUPERALLOYS[J]. Acta Metall Sin, 2012, 48(7): 845-852.

全文: PDF(4494 KB)  
摘要: 通过对4种不同Re(3%-6%, 质量分数, 下同)和Ru(0%和3%)含量的镍基单晶高温合金铸态和热处理态组织的观察和成分分析, 研究了Re和Ru对元素偏析以及热处理过程中组织演化的影响. 结果表明, Re和Ru均会加剧铸态试样中的元素偏析, 但经过固溶处理后, Ru对合金元素的残余偏析的影响不大. 随着Re含量的增加和Ru的加入, 热处理态组织中γ' 相尺寸减小, 形貌的立方程度明显增加. 电子探针(EPMA)对成分的测量结果显示, Al, Ta和 Ni偏析于γ'  沉淀相, Re和Cr强烈地偏析于γ'相, 而Ru和W向γ'相的偏析程度则相对较低. Re含量的增加明显增大了Re, Cr, Co和W等元素向γ'相的偏析, 而Ru的加入则使得这些TCP相形成元素向γ'相的偏析程度略有降低.
关键词 RuRe单晶高温合金微观组织偏析γ' 相形貌    
Abstract:The influence of Re and Ru on segregation and microstructure evolution during heat treatment has been investigated in four Ni-based single-crystal superalloys with varied contents of Re (3%-6%, mass fractions) and Ru (0% and 3%). The additions of Re and Ru lead to the more severe segregation of alloying elements in as-cast structures. However, the effects of Ru on as-cast segregation can be neglected after the stepwise solution heat treatments. The additions of Re and Ru lead to the lower γ'-coarsening rate, more cuboidal γ'-morphology and reduced γ'-size. Electron microprobe analysis (EPMA) indicates that Al, Ta and Ni partition to the γ'-precipitates, whereas Re and Cr strongly partition to the γ-matrix. In comparison to Re and Cr, Ru and W show the less tendency to partition to the γ-matrix. Additionally, Re increases the supersaturation of Re, Cr, Co and W in the γ-matrix, whereas Ru only slightly suppresses the partition of these TCP-forming elements to the γ-matrix.
Key wordsRu    Re    single-crystal superalloy    microstructure    segregation    γ'-morphology
收稿日期: 2012-01-04     
ZTFLH: 

TG146

 
基金资助:

国家自然科学基金项目50931004, 50827102和50771081及国家重点基础研究发展计划项目2010CB631202和2011CB610406资助

作者简介: 刘刚, 男, 1983年生, 博士生
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