INFLUENCE OF Ru AND Cr ON SOLIDIFICATION PROCESS IN A Re-FREE Ni-BASED SINGLE CRYSTAL SUPERALLOY

doi:10.11900/0412.1961.2014.00148

Acta Metall Sin

2014, Vol. 50

Issue (9): 1025-1030 DOI: 10.11900/0412.1961.2014.00148

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INFLUENCE OF Ru AND Cr ON SOLIDIFICATION PROCESS IN A Re-FREE Ni-BASED SINGLE CRYSTAL SUPERALLOY

LUO Yinping, ZHOU Yizhou(

), LIU Jinlai

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

LUO Yinping, ZHOU Yizhou, LIU Jinlai. INFLUENCE OF Ru AND Cr ON SOLIDIFICATION PROCESS IN A Re-FREE Ni-BASED SINGLE CRYSTAL SUPERALLOY. Acta Metall Sin, 2014, 50(9): 1025-1030.

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Abstract

The effect of addition of Ru and change of Cr content on solidification behaviors are systematically investigated in a Re-free Ni-based single crystal superalloy with a fixed mass fraction additions of Ru and Cr, with the use of DTA, OM, SEM and EPMA. The results show that the addition of Ru can increase the eutectic fraction, facilitate the formation of Ru-rich phase which would increase largely at the time of Ru and Cr addition synchronously. Ru addition can promotes W segregate to the dendrite arm, and inhibits Mo to segregate to the interdendritic region. The increasement of Cr addition can decrease the segregation ratio of W, but have little effect on Mo. The combination of Ru and Cr influences the solidification microstructures and segregation behaviors corporately, and thus influences heat treatment processes and the microstructure stability.

Key words: Ru Cr Ni-based single crystal superalloy solidification behavior elemental segregation

ZTFLH:

TG146

Fund: Supported by National Natural Science Foundation of China (Nos.U1037601 and 51271186) and National Basic Research Program of China (No.2010CB631206)

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	Yinping LUO
	Yizhou ZHOU
	Jinlai LIU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00148 OR https://www.ams.org.cn/EN/Y2014/V50/I9/1025

Table 1 Nominal compositions of experimental alloys

Fig.2 OM image showing the solidification microstructure of 10Cr3Ru alloy

Fig.3 SEM images of the eutectic microstructures in experimental alloys

Table 2 Phase transformation temperatures for experimental alloys at heating process

Fig.4 Eutectic area fraction of experimental alloys

Table 3 EPMA analysis of phases in 10Cr3Ru alloy

Fig.5 Segregation ratio (k) of each element for experimental alloys

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