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Precipitation Behavior of Pt2Mo-Type Superlattices in Hastelloy C-2000 Superalloy with Low Mo/Cr Ratio

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Abstract

This paper focuses on the precipitation behavior of superlattices phases in new Hastelloy C-2000 alloy with low Mo/Cr ratio owing to their detrimental effects on both mechanical and corrosion-resistance properties of the alloys. The precipitation behavior of superlattices phases in the C-2000 alloy was investigated at 600 °C in the aging time range of 100-500 h. The results revealed that Pt2Mo-type superlattices phases have been precipitated after aging at 600 °C for 100 h. Typically, the Pt2Mo-type precipitated phases meet to a stoichiometric ratio of Ni2(Cr, Mo) in this alloy. As increasing aging time from 100 to 500 h, size of the phase increases from around 13 to 55 nm. Besides, morphology of the Ni2(Cr, Mo) precipitated phases changes from a lean to a fat ellipse with increasing aging time due to the effect of the Mo/Cr atomic ratio and alloying elements on transformation paths from disorder to order. In addition, solution temperature of the Pt2Mo-type superlattices is around 725 °C determined by differential scanning calorimetry method, which was significantly dependent on the heating rate.

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Acknowledgments

This work was supported by the National High Technology Research and Development Program of China (No. 2013AA031004), the National Natural Science Foundation of China (No. 51171150), and the Program of Introducing Talents of Discipline to Universities (No. B08040).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Liang Yuan, Rui Hu, Tiebang Zhang, Yinben Han, Xiangyi Xue & Jinshan Li

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Correspondence to Rui Hu.

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Yuan, L., Hu, R., Zhang, T. et al. Precipitation Behavior of Pt2Mo-Type Superlattices in Hastelloy C-2000 Superalloy with Low Mo/Cr Ratio. J. of Materi Eng and Perform 23, 3314–3320 (2014). https://doi.org/10.1007/s11665-014-1126-1

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