Effect of Alloying Elements on Microstructure and Mechanical Properties of High Temperature Die Material DM02 Alloy

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The effect of Ta, Nb, Hf and Zr on the microstructure and high temperature tensile properties of DM02 alloy, which is a novel developed Ni base superalloy for high temperature die material, had been studied in this paper. The results showed that the four alloying elements affect the composition and morphology of carbides obviously, and have almost no effect on the morphology and size of γ´ phase in DM02 alloy. 0.5-1wt% Hf make the morphology of MC carbide change from bone-like to blocky and inhibit the formation of primary M6C carbide, thus improve the ductility of DM02 alloy, while 0.1wt% Zr has no similar effect. The strengthening effect of 3wt% Ta is better than that of 1.5wt% Nb. DM02 alloy with 3wt% Ta and 0.5wt% Hf has high strength and good ductility at 1050°C.

Info:

Periodical:

Materials Science Forum (Volumes 546-549)

Edited by:

Yafang Han et al.

Pages:

1257-1260

Citation:

J. X. Song et al., "Effect of Alloying Elements on Microstructure and Mechanical Properties of High Temperature Die Material DM02 Alloy", Materials Science Forum, Vols. 546-549, pp. 1257-1260, 2007

Online since:

May 2007

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$38.00

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[2] David Furrer, Advanced Materials & Processes, vol. 3(1999), P. 33.

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[4] Superalloy, Huang Qianrao, Li Hankang, Metallurgical Industry Press of China, Beijing (2000). Fig. 2 HfC phase in 2# specimen of DM02 alloy HfC.