Effect of laser surface re-melting on the microstructure and properties of Zr alloy

Ji, Pengfei; Li, B.; Liu, S.G.; Chen, B.H.; Zhang, X.Y.; Ma, Mingzhen; Liu, R.P.

doi:10.1016/j.matlet.2020.127352

Cited by 9 publications

(1 citation statement)

References 16 publications

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“…Zr-based alloys have high corrosion resistance in high-temperature aqueous solutions, good mechanical properties, and resistance to radiation damage, which are widely used in aerospace [4], military [5], nuclear reaction [6], atomic energy [7], chemical engineering [8], marine engineering, medicine [8], biology and so on [9]. At present, many research scientists are shifting their focus to the mechanical properties of Zrbased alloys to expand further the application potential of Zr in the structural field [10][11][12][13]. However, the mechanical properties of these alloys are poor, including their ultimate tensile strength (less than 900 MPa), which does not meet the requirements of engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Study on microstructure and wear resistance of Zr-17Nb alloy irradiated by high current pulsed electron beam

Sun

Gao

et al. 2020

Reviews on Advanced Materials Science

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In this paper, the microstructure and wear resistance of Zr-17Nb alloy treated by high current pulsed electron beam were studied in detail. A phase change occurs after pulse treatments using X-Ray Diffraction (XRD) analysis, showing β (Nb) phase and α (Zr) phase transformed by a part of β (Zr, Nb) phase. Also, narrowing and shifting of β (Zr, Nb) diffraction peaks were found. Scanning Electron Microscope (SEM) and metallographic analysis results reveal that the microstructure of alloy surface before high current pulsed electron beam (HCPEB) treatment is composed of equiaxed crystals. But, after 15 and 30 pulse treatments, crater structures are significantly reduced. Besides, it was also found that the alloy surface has undergone eutectoid transformation after 30 pulse treatments, and the reaction of β (Zr, Nb) → αZr + βNb had occurred. Microhardness test results show that microhardness value presents a downward trend as the number of pulses increases, which is mainly due to the coarsening of the grains and the formation of a softer β (Nb) phase after phase transformation. The wear resistance test results show that the friction coefficient increases first, then decreases and then increases with the increase of pulse number.

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