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题名: Effect of minor additions on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloy
作者: Zhang, HW;  Qin, XZ;  Li, XW;  Zhou, LZ
发表日期: 2018-1-10
摘要: The effects of C, Zr and Y/Ce on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloys were investigated. The morphology of MC carbides does not change in as-cast alloys, as the C content is increased or the Zr is added. However, the Y/Ce additions promote the transformation of MC carbide morphology from blocky to script-like type. Compared with that in as-cast alloys, there is no obvious change in the morphologies of MC carbide or chemical compositions after heat treatment. The increasing of C content and the addition of Zr or Y/Ce significantly decreases and increases the amount of the gamma/gamma' eutectic, respectively. After a solid solution treatment and subsequently a two-stage aging treatment, the gamma' phase is characteristic with two kinds of shapes and sizes, and the volume fraction of cuboidal gamma' phase is much larger than that of spherical gamma' phases. More MC carbide and residual eutectic result from the decreasing of cuboidal gamma' phase volume fraction. The decrease in volume fraction of cuboidal gamma' phase is principally responsible for the reduction of the stress rupture property. In addition, script-like carbide and residual eutectic remaining after heat treatment play the secondary role in the degradation of the stress rupture properties. The less regularly arranged cuboidal gamma' phase can damage the stress rupture life to some extent. The spherical gamma' phase re-dissolves into gamma' matrix widening the spacing between large cuboidal gamma' phase, and the addition of Zr inhibits grain boundary sliding and cracking; these two facts are beneficial to the rupture elongation.
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Recommended Citation:
Zhang, HW,Qin, XZ,Li, XW,et al. Effect Of Minor Additions On The Microstructures And Stress Rupture Properties Of A Directionally Solidified Ni-based Superalloy[J]. Materials Science And Engineering A-structural Materials Properties Microstructure And Processing,2018,711:303-312.

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