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Acta Metall Sin  2020, Vol. 56 Issue (5): 715-722    DOI: 10.11900/0412.1961.2019.00275
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Microstructure and Corrosion Behavior of Fe-15Mn-5Si-14Cr-0.2C Amorphous Steel
ZHAO Yanchun1,2(), MAO Xuejing1, LI Wensheng1, SUN Hao1, LI Chunling3, ZHAO Pengbiao1, KOU Shengzhong1, Liaw Peter K.2
1.State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2.Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996-2200, USA
3.College of Mechano-Electronic Engineering, Lanzhou University of Technology, Lanzhou 730050, China
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Abstract  

Amorphous steels exhibit ultra-high strength but room-temperature brittleness and strain-softening behavior as loading, which restricted the application of amorphous steels as high-performance structural material. Developing in situ crystals is an effective way to toughen the amorphous alloys. However, the crystals may sacrifice the corrosion resistance of amorphous steels. In this work, austenite and ferrite duel phases were introduced to the amorphous phase, via transformation induced plasticity (TRIP) of the austenite as loading, to enhance the ductility and improve the work-hardening behavior; and via the synergy of ferrite and amorphous phase to ensure the corrosion resistance. A novel amorphous steel Fe-15Mn-5Si-14Cr-0.2C was fabricated by magnetic suspension melting in a water-cooled copper crucible, and negative pressure suction casting into a copper mold. The microstructure and mechanical properties of the amorphous steel were characterized by XRD, EBSD and the electronic universal testing machine. The corrosion behavior in artificial seawater was studied on an electrochemical work station with a three-electrode system, and the corrosion morphology and corrosion products were characterized by SEM with EDS analysis. The results showed that the as-cast amorphous steel consisted of the amorphous matrix, CFe15.1 super-cooled austenite and Fe-Cr ferrite phases. From surface to inner, amorphous phases mainly exist in the margin, while crystalline phases are abundantly distributed in the center. The amorphous steel exhibited excellent comprehensive mechanical properties at room temperature, and its yield strength, fracture strength and plastic strain were up to 978 MPa, 2645 MPa and 35.8%, respectively. In artificial seawater, compared with 304 stainless steel, the amorphous steel showed high self-corrosion potential, low self-corrosion current density and high polarization resistance, large resistance arc radius, only one high frequency resistance arc and low corrosion kinetic rate. Moreover, the stable and dense passivation film was observed on the corrosion surface. Their excellent corrosion resistance and mechanical properties endow the amorphous steel with the potential to become a novel corrosion-resistant structural material for marine engineering.

Key words:  amorphous steel      microstructure      mechanical property      corrosion behavior     
Received:  19 August 2019     
ZTFLH:  TG139.8  
Fund: National Natural Science Foundation of China(51661017);China Scholarship Council(201808625027);Outstanding Youth Funds of Gansu Province(17JR5RA108);Hongliu Outstanding Youth Funds of Lanzhou University of Technology
Corresponding Authors:  ZHAO Yanchun     E-mail:  zhaoyanchun@lut.edu.cn

Cite this article: 

ZHAO Yanchun, MAO Xuejing, LI Wensheng, SUN Hao, LI Chunling, ZHAO Pengbiao, KOU Shengzhong, Liaw Peter K.. Microstructure and Corrosion Behavior of Fe-15Mn-5Si-14Cr-0.2C Amorphous Steel. Acta Metall Sin, 2020, 56(5): 715-722.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00275     OR     https://www.ams.org.cn/EN/Y2020/V56/I5/715

Fig.1  XRD spectra of as-cast Fe-15Mn-5Si-14Cr-0.2C sample and fractured sample after loading
Fig.2  Engineering stress-strain curve of as-cast Fe-15Mn-5Si-14Cr-0.2C sample at room temperature
Fig.3  EBSD images of as-cast Fe-15Mn-5Si-14Cr-0.2C sample in edge zone (a), center zone (b) and fractured sample after loading (c)
Fig.4  Potentiodynamic polarization curves of Fe-15Mn-5Si-14Cr-0.2C alloy and 304 stainless steel in artificial seawater at 298 K (i—current density)

Alloy

Ecorr

mV

icorr

μA·cm-2

Rp

106 Ω·cm2

Epit

mV

Epit-Ecorr

mV

304 stainless steel-263.431.5822.2384.93648.41
Fe-15Mn-5Si-14Cr-0.2C-211.850.4908.9598.58810.43
Table 1  Corrosion parameters of Fe-15Mn-5Si-14Cr-0.2C alloy and 304 stainless steel in artificial seawater at 298 K
Fig.5  AC impedance diagrams of Fe-15Mn-5Si-14Cr-0.2C alloy and 304 stainless steel in artificial seawater at 298 K (Zim—imaginative part of impedance, Zre—real part of impedance)
Fig.6  SEM images of Fe-15Mn-5Si-14Cr-0.2C alloy after electrochemical corrosion at margin (a) and center (b) areas
AreaFeMnSiCrC
Margin56.547.3215.496.1514.50
Center58.8011.606.588.2714.75
Table 2  EDS analyses of Fe-15Mn-5Si-14Cr-0.2C alloy after electrochemical corrosion at margin and center areas
Fig.7  SEM-BS image of Fe-15Mn-5Si-14Cr-0.2C after electrochemical corrosion
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