Formation of Fe-19 wt%Cr-9 wt%Ni Nanocrystalline Alloy with Excellent Corrosion Resistance: Phase Transition and Microstructure

doi:10.1007/s40195-020-01178-x

Abstract

Abstract:

In this paper, microstructure characteristics and phase transitions of Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy are comprehensively studied during the mechanical alloying and hot pressing sintering processes. Corrosion resistance of the sintered Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy samples is further analyzed. During the mechanical alloying process, Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy powders mainly composed of metastable ferrite phase are obtained after mechanical alloying for 8, 16 and 24 h, respectively. In the subsequent hot pressing sintering process, the phase transitions (from ferrite to austenite) occur from 650 to 750 °C for Fe-19 wt%Cr-9 wt%Ni alloy powders milled for 24 h. When the sintering temperature is raised to 1050 °C for 1 h, the ferrite phase has transformed into austenite phase completely, and the obtained grain size of sintered Fe-19 wt%Cr-9 wt%Ni alloy is around 40 nm. Electrochemistry test of the sintered Fe-19 wt%Cr-9 wt%Ni alloy has been operated in 0.5 mol L ^-1 H₂SO₄ solution to show the corrosion resistance properties. Results show that the sintered Fe-19 wt%Cr-9 wt%Ni alloy exhibits excellent corrosion resistance, which is proved by higher self-corrosion potential, lower self-corrosion current density and larger capacitive reactance, compared with that of commercial 304 stainless steel.

Key words: Mechanical alloying, Hot pressing sintering, Nanocrystalline alloy, Phase transition, Corrosion resistance

Chongfeng Sun, Shengqi Xi, Xiaofeng Dang, Jianping Li, Yongchun Guo, Zhong Yang, Yaping Bai. Formation of Fe-19 wt%Cr-9 wt%Ni Nanocrystalline Alloy with Excellent Corrosion Resistance: Phase Transition and Microstructure[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(6): 825-833.

Figures/Tables 9

Table 1 Chemical composition of commercial 304 stainless steel (wt%)

Fe	Cr	Ni	Mo	Si	Total
66.21	22.56	8.34	2.70	0.19	100

Fig. 1 Morphologies of the Fe-19 wt%Cr-9 wt%Ni powder samples milled for different times

Fig. 2 a XRD patterns of the Fe-19 wt%Cr-9 wt%Ni alloy powder for different milling times; b curves of the crystallite size and internal strain of ferrite phase vs. milling time

Fig. 3 EDS/STEM analysis of the Fe-19 wt%Cr-9 wt%Ni alloy powder milled for 24 h

Fig. 4 XRD patterns of Fe-19 wt%Cr-9 wt%Ni alloy: a sintered at different temperatures (powder milled for 24 h); b sintered at 1050 °C (powder milled for 8 h, 16 h and 24 h)

Fig. 5 a BF image, b SAED pattern of Fe-19 wt%Cr-9 wt%Ni alloy sintered at 1050 °C (powder milled for 24 h)

Fig. 6 Morphology features and chemical composition of Fe-19 wt%Cr-9 wt%Ni alloy sintered at different temperatures (powder milled for 24 h): a 950 °C, b 1050 °C, c chemical composition analysis of alloy sintered at 1050 °C

Fig. 7 a Potential dynamic polarization curves and b EIS curves of the Fe-19 wt%Cr-9 wt%Ni alloy sintered at 1050 °C (powder milled for 24 h) and the reference sample

Fig. 8 Schematic illustration of austenization for ferrite phase during HPS

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