论文

EFFECTS OF Re AND Ru ON MICROSTRUCTURE AND SEGREGATION OF Ni-BASED SINGLE-CRYSTAL SUPERALLOYS

  • LIU Gang ,
  • LIU Lin ,
  • ZHANG Qing-Xia ,
  • YANG Chu-Bin ,
  • ZHANG Jun ,
  • FU Heng-Zhi
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  • State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072

Received date: 2012-01-04

  Revised date: 2012-04-16

  Online published: 2012-07-11

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.

Cite this article

LIU Gang , LIU Lin , ZHANG Qing-Xia , YANG Chu-Bin , ZHANG Jun , FU Heng-Zhi . EFFECTS OF Re AND Ru ON MICROSTRUCTURE AND SEGREGATION OF Ni-BASED SINGLE-CRYSTAL SUPERALLOYS[J]. Acta Metall Sin, 2012 , 48(7) : 845 -852 . DOI: 10.3724/SP.J.1037.2012.00001

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