EFFECT OF TRACE ELEMENT B ON MICROSTRUCTURE OF DIRECTIONALLY SOLIDIFIED Co-BASE SUPER ALLOY DZX40M

Abstract

Abstract: The effect of trace element B on microstructure of directionally solidified new type Co-base superalloy is studied systematically in this paper. It is found that the addition of B makes the incipient melting temperature of the alloy decline remarkably. Compared with the alloy having a boron content of 0.05 %, the incipient melting temperature of the alloy with 0.7 % B decreases by 197℃. The primary and secondary dendrite arm spacings increase and the volume fraction of interdendritic carbides with fine microstructure becomes bigger with the enhancement of boron content. When the alloy is with 0.7wt %B, M3B2 precipitates in the interdendrites.

Key words: horon, directional solidification, Co-base superalloy, DZX40M

SUN LilingInstitute of Metal Research, Chinese Academy of Sciences, Shenyang, ChinaWU QiShenyang College of Technology, Shenyang, ChinaZHANG Zhiya, HU ZhuangqiInstitute of Metal Research, Chinese Academy of Sciences, Shenyang, China. EFFECT OF TRACE ELEMENT B ON MICROSTRUCTURE OF DIRECTIONALLY SOLIDIFIED Co-BASE SUPER ALLOY DZX40M[J]. Acta Metallurgica Sinica (English Letters), 1994, 7(1): 23-26.

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EFFECT OF TRACE ELEMENT B ON MICROSTRUCTURE OF DIRECTIONALLY SOLIDIFIED Co-BASE SUPER ALLOY DZX40M

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