Effect of Mo and Bi Additions on the Microstructure of Zr–Cr–Fe Alloy After β-Quenching
This work investigated the solid-states phase transformation behavior of Zr–Cr–Fe alloys during rapid cooling from β-phase region. Scanning electron microscopy (SEM) was used to characterize the microstructure evolution of Zr–Cr–Fe alloys containing different Mo and Bi contents. The results show that two different phase transformation modes were involved during β to α transformation for different domains within prior β grains: (i) Martensitic transformation resulting in lath-shaped grains occured within prior β grain interiors. (ii) Massive transformation generating massive-shaped grains initiated along two adjacent prior β parent grain boundaries. Alpha (α) lath width reduced with increasing Mo concentration while Mo strongly retarded massive phase transformation. Interestingly microstructures exhibited no significant variation in the case of specimens containing different Bi contents irrespective of the phase transformation modes.
KeywordsMartensitic transformation Massive transformation Zr–Cr–Fe alloy Mo and bi
This study is financially supported by the programs of National Natural Science Foundation of China (51531005, 51421001, 51371202 and 51501021).
- 15.A. Phillips, The alpha-beta transformation in brass. Trans. Am. Inst. Min. Metall. Petrol. Eng. 89, 194 (1930)Google Scholar
- 24.J.M. Wang et al., “Experimental observation of massive transformation in a Zr-Cr-Fe alloy,” To be published, 2016Google Scholar
- 25.C. Toffolon et al., Experimental study and preliminary thermodynamic calculations of the pseudo-ternary Zr-Nb-Fe-(O, Sn) system, in Zirconium in the Nuclear Industry: Thirteenth International Symposium, 2002Google Scholar