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High-Temperature Creep Deformation and Fracture Behavior of a Directionally Solidified Ni-Base Superalloy DZ951

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Abstract

The high-temperature creep deformation and fracture behavior of a directionally solidified Ni-base superalloy DZ951 have been investigated over a wide stress range of 110 to 880 MPa at high temperatures (700 °C to 1000 °C). In this article, the detailed creep deformation and fracture mechanism have been studied. The results show that the creep curves exhibit strong temperature dependence. From transmission election microscopy (TEM) observations, it is suggested that the deformation mechanism is temperature dependent and mainly consists of three dislocation-controlling mechanisms: stacking faults and dislocation-pair shearing, dislocation bowing, and dislocation climbing. It is found that the fracture mode of DZ951 alloy changes from cleavagelike fracture at low temperature to ductile fracture at high temperature. At 700 °C, the creep cracks mainly initiate at the surface and propagate along the cleavagelike facets. With increasing temperature, cracks can initiate at the surface, carbide/matrix interface, and cast pore. The growth of microcrack has a direction perpendicular to the stress direction. The creep-rupture data follow the Monkman–Grant relationship in different temperature regions.

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Notes

  1. JEOL is a trademark of JEOL Ltd., Tokyo, Japan.

  2. PHILIPS is a trademark of FEI Company, Hillsboro, OR.

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Authors and Affiliations

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P.R. China

    Zhaokuang Chu (Assistant Professor), Jinjiang Yu (Associate Professor), Xiaofeng Sun (Professor), Hengrong Guan (Professor) & Zhuangqi Hu (Academician)

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  1. Zhaokuang Chu
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  2. Jinjiang Yu
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  3. Xiaofeng Sun
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  4. Hengrong Guan
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  5. Zhuangqi Hu
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Correspondence to Zhaokuang Chu.

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Manuscript submitted November 30, 2007.

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Chu, Z., Yu, J., Sun, X. et al. High-Temperature Creep Deformation and Fracture Behavior of a Directionally Solidified Ni-Base Superalloy DZ951. Metall Mater Trans A 40, 2927–2937 (2009). https://doi.org/10.1007/s11661-009-0001-4

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