Effect of grain size on mechanical property and corrosion resistance of the Ni-based alloy 690

doi:10.1016/j.jmst.2017.12.017

Abstract

Abstract:

Mechanical property of coarse grained and nano/ultrafine grained alloy 690 and their corrosion resistance after immersion in high temperature borate buffer solution were investigated. The grain refinement significantly enhances the tensile strength of the alloy 690. In addition, the grain refinement facilitates the formation of the deformation twin which improves the ductility of the alloy 690. It has been found that the grain refinement promotes to form more Cr₂O₃ on the surface of the alloy 690 in high temperature borate buffer solution. At the same time, the grain refinement inhibits the formation of spinel type oxides. More hematite type oxides formed on nano/ultrafine grained alloy 690 improves its corrosion resistance in borate buffer solution. The hematite type oxides have a lower concentration of point defect than that of the spinel type oxides, which results in an excellent corrosion resistance of nano/ultrafine grained alloy 690. These results are supported by the Mott-Schottky analysis and the point defect model.

Key words: Alloys, Buffer, Deformation, Electrochemical impedance spectroscopy, Electrochemistry, Interfaces, Nanocrystalline, Oxidation

Jinlong Lv. Effect of grain size on mechanical property and corrosion resistance of the Ni-based alloy 690[J]. J. Mater. Sci. Technol., 2018, 34(9): 1685-1691.

Figures/Tables 11

Fig. 1. (a) Microstructures of solid solution alloy 690, (b) TEM micrographs illustrating microstructure of NUG alloy 690, (c) grain size distribution of NUG alloy 690 and (d) engineering stress-strain curves of CG and NUG alloy 690.

Fig. 2. XRD patterns of (a) CG and (b) NUG alloy 690, (c) hardness variations of CG and NUG alloy 690 with different strain levels.

Fig. 3. Representative TEM micrographs of (a, b) CG and (c, d) NUG alloy 690 with (a, c) 20% and (b, d) 40% strain levels, respectively (The insert shows the twinning bundle).

Fig. 4. SEM surface morphologies of (a) coarse grained oxidized (CG—O) and (b) nano/ultrafine grained oxidized (NUG—O) alloy 690.

Fig. 5. (a) XRD patterns and (b) Raman spectra of the oxides formed on alloy 690 after being exposed to high temperature borate buffer solution.

Fig. 6. (a) Anodic polarization curves and (b) OCP in borate buffer solution for alloy 690 before and after being exposed to high temperature borate buffer solution.

Fig. 7. Nyquist (a) and (b) Bode plots of four samples at OCP in borate buffer solution (ZRe and ZIm represent impedance real part and impedance imaginary part, respectively).

Table 1 Parameters extracted from EIS data for four alloy 690 samples immersed in borate buffer solution.

Sample	R_s (Ω cm²)	Q_f		R_f (Ω cm²)
Sample	R_s (Ω cm²)	Y_O (Ω^-1 cm^-2 Sⁿ)	n	R_f (Ω cm²)
CG	32.1	3.1 × 10^-5	0.90	0.78 × 10⁶
NUG	31.4	2.7 × 10^-5	0.92	1.33 × 10⁶
CG-O	33.7	3.8 × 10^-5	0.88	1.05 × 10⁵
NUG-O	31.5	3.5 × 10^-5	0.89	2.33 × 10⁵

Fig. 8. (a) The Mott-Schottky plots of four samples in borate buffer solution, (b) donor concentration (Nd) and acceptor concentration (NA) in passive films and oxides calculated from slopes of Mott-Schottky plots (E is applied potential; NA1 and NA2 are shallow and deep acceptor concentrations, respectively; ND1 and ND2 are shallow and deep donor concentrations, respectively).

Fig. 9. Anodic polarization curves of four samples in borate buffer solution with 0.2 mol NaCl.

Fig. 10. (a) Mott-Schottky plots of four samples in borate buffer solution with 0.2 mol NaCl, (b) corresponding acceptor and donor concentrations in passive films and oxides.

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