Characterization and corrosion resistance of boron-containing-austenitic stainless steels produced by rapid solidification techniques

Guilherme Y. Koga; Lucas B. Otani; Ana M.B. Silva; Virginie Roche; Ricardo P. Nogueira; Alberto M. Jorge; Claudemiro Bolfarini; Claudio S. Kiminami; Walter J. Botta

doi:10.3390/ma11112189

Characterization and corrosion resistance of boron-containing-austenitic stainless steels produced by rapid solidification techniques

Guilherme Y. Koga, Lucas B. Otani, Ana M.B. Silva, Virginie Roche, Ricardo P. Nogueira, Alberto M. Jorge, Claudemiro Bolfarini, Claudio S. Kiminami, Walter J. Botta

Chemical and Petroleum Engineering

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Abstract

The composition of a commercial duplex stainless steel was modified with boron additions (3.5, 4.5, and 5.5 wt.%) and processed by rapid-quenching techniques: Melt-spinning, copper-mold casting, and high-velocity oxygen fuel (HVOF). Spray deposition was also used to produce alloys as the process may induce rapid-solidified-like microstructures. These processing routes led to microstructures with distinguished corrosion resistance. Among the alloys with different boron contents, the 63.5Fe25Cr7Ni4.5B composition enabled the production of fully amorphous ribbons by melt-spinning. The cooling rate experienced during copper-mold casting, high-velocity oxygen fuel, and spray deposition did not ensure complete amorphization. The crystalline phases thereby formed were (Fe,Cr)₂B and (Fe,Mo)₃B₂ borides in an austenitic-matrix with morphology and refinement dependent of the cooling rates. Fully amorphous 63.5Fe25Cr7Ni4.5B ribbons exhibited outstanding corrosion resistance in chloride-rich alkaline and acid media with negligible corrosion current densities of about 10^-8 A/cm² and a broad passivation plateau. Although the specimens of the same composition produced by HVOF process and spray deposition exhibited lower corrosion resistance because of intrinsic porosity and crystalline phases, their corrosion behaviors were superior to those of AISI 1045 steel used as substrate with the advantage to be reinforced with hard borides known to be resistant against wear.

Original language	British English
Article number	2189
Journal	Materials
Volume	11
Issue number	11
DOIs	https://doi.org/10.3390/ma11112189
State	Published - 5 Nov 2018

Keywords

Bulk amorphous alloys
Corrosion
Rapid solidification
Stainless steel
Thermo-calc

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10.3390/ma11112189

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@article{d0da81c7e5734b17a519175c0130937d,

title = "Characterization and corrosion resistance of boron-containing-austenitic stainless steels produced by rapid solidification techniques",

abstract = "The composition of a commercial duplex stainless steel was modified with boron additions (3.5, 4.5, and 5.5 wt.%) and processed by rapid-quenching techniques: Melt-spinning, copper-mold casting, and high-velocity oxygen fuel (HVOF). Spray deposition was also used to produce alloys as the process may induce rapid-solidified-like microstructures. These processing routes led to microstructures with distinguished corrosion resistance. Among the alloys with different boron contents, the 63.5Fe25Cr7Ni4.5B composition enabled the production of fully amorphous ribbons by melt-spinning. The cooling rate experienced during copper-mold casting, high-velocity oxygen fuel, and spray deposition did not ensure complete amorphization. The crystalline phases thereby formed were (Fe,Cr)2B and (Fe,Mo)3B2 borides in an austenitic-matrix with morphology and refinement dependent of the cooling rates. Fully amorphous 63.5Fe25Cr7Ni4.5B ribbons exhibited outstanding corrosion resistance in chloride-rich alkaline and acid media with negligible corrosion current densities of about 10-8 A/cm2 and a broad passivation plateau. Although the specimens of the same composition produced by HVOF process and spray deposition exhibited lower corrosion resistance because of intrinsic porosity and crystalline phases, their corrosion behaviors were superior to those of AISI 1045 steel used as substrate with the advantage to be reinforced with hard borides known to be resistant against wear.",

keywords = "Bulk amorphous alloys, Corrosion, Rapid solidification, Stainless steel, Thermo-calc",

author = "Koga, {Guilherme Y.} and Otani, {Lucas B.} and Silva, {Ana M.B.} and Virginie Roche and Nogueira, {Ricardo P.} and Jorge, {Alberto M.} and Claudemiro Bolfarini and Kiminami, {Claudio S.} and Botta, {Walter J.}",

note = "Funding Information: Funding: This work was mainly supported by FAPESP through a Thematic Project (grant number 2013/05987-8) and through a post-doctoral FAPESP funding (grant number 2017/09237-4). Funding Information: Acknowledgments: The authors gratefully acknowledge the Brazilian financial support agencies CAPES, CNPq, and FAPESP, and to the Laboratory of Structural Characterization of the Federal University of S{\~a}o Carlos (LCE/DEMa/UFSCar) for the use of electron microscopy and X-ray diffraction facilities. Petrobras is also acknowledged for the financial support. Publisher Copyright: {\textcopyright} 2018 by the authors.",

year = "2018",

month = nov,

day = "5",

doi = "10.3390/ma11112189",

language = "British English",

volume = "11",

journal = "Materials",

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publisher = "MDPI AG",

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TY - JOUR

T1 - Characterization and corrosion resistance of boron-containing-austenitic stainless steels produced by rapid solidification techniques

AU - Koga, Guilherme Y.

AU - Otani, Lucas B.

AU - Silva, Ana M.B.

AU - Roche, Virginie

AU - Nogueira, Ricardo P.

AU - Jorge, Alberto M.

AU - Bolfarini, Claudemiro

AU - Kiminami, Claudio S.

AU - Botta, Walter J.

N1 - Funding Information: Funding: This work was mainly supported by FAPESP through a Thematic Project (grant number 2013/05987-8) and through a post-doctoral FAPESP funding (grant number 2017/09237-4). Funding Information: Acknowledgments: The authors gratefully acknowledge the Brazilian financial support agencies CAPES, CNPq, and FAPESP, and to the Laboratory of Structural Characterization of the Federal University of São Carlos (LCE/DEMa/UFSCar) for the use of electron microscopy and X-ray diffraction facilities. Petrobras is also acknowledged for the financial support. Publisher Copyright: © 2018 by the authors.

PY - 2018/11/5

Y1 - 2018/11/5

N2 - The composition of a commercial duplex stainless steel was modified with boron additions (3.5, 4.5, and 5.5 wt.%) and processed by rapid-quenching techniques: Melt-spinning, copper-mold casting, and high-velocity oxygen fuel (HVOF). Spray deposition was also used to produce alloys as the process may induce rapid-solidified-like microstructures. These processing routes led to microstructures with distinguished corrosion resistance. Among the alloys with different boron contents, the 63.5Fe25Cr7Ni4.5B composition enabled the production of fully amorphous ribbons by melt-spinning. The cooling rate experienced during copper-mold casting, high-velocity oxygen fuel, and spray deposition did not ensure complete amorphization. The crystalline phases thereby formed were (Fe,Cr)2B and (Fe,Mo)3B2 borides in an austenitic-matrix with morphology and refinement dependent of the cooling rates. Fully amorphous 63.5Fe25Cr7Ni4.5B ribbons exhibited outstanding corrosion resistance in chloride-rich alkaline and acid media with negligible corrosion current densities of about 10-8 A/cm2 and a broad passivation plateau. Although the specimens of the same composition produced by HVOF process and spray deposition exhibited lower corrosion resistance because of intrinsic porosity and crystalline phases, their corrosion behaviors were superior to those of AISI 1045 steel used as substrate with the advantage to be reinforced with hard borides known to be resistant against wear.

AB - The composition of a commercial duplex stainless steel was modified with boron additions (3.5, 4.5, and 5.5 wt.%) and processed by rapid-quenching techniques: Melt-spinning, copper-mold casting, and high-velocity oxygen fuel (HVOF). Spray deposition was also used to produce alloys as the process may induce rapid-solidified-like microstructures. These processing routes led to microstructures with distinguished corrosion resistance. Among the alloys with different boron contents, the 63.5Fe25Cr7Ni4.5B composition enabled the production of fully amorphous ribbons by melt-spinning. The cooling rate experienced during copper-mold casting, high-velocity oxygen fuel, and spray deposition did not ensure complete amorphization. The crystalline phases thereby formed were (Fe,Cr)2B and (Fe,Mo)3B2 borides in an austenitic-matrix with morphology and refinement dependent of the cooling rates. Fully amorphous 63.5Fe25Cr7Ni4.5B ribbons exhibited outstanding corrosion resistance in chloride-rich alkaline and acid media with negligible corrosion current densities of about 10-8 A/cm2 and a broad passivation plateau. Although the specimens of the same composition produced by HVOF process and spray deposition exhibited lower corrosion resistance because of intrinsic porosity and crystalline phases, their corrosion behaviors were superior to those of AISI 1045 steel used as substrate with the advantage to be reinforced with hard borides known to be resistant against wear.

KW - Bulk amorphous alloys

KW - Corrosion

KW - Rapid solidification

KW - Stainless steel

KW - Thermo-calc

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U2 - 10.3390/ma11112189

DO - 10.3390/ma11112189

M3 - Article

AN - SCOPUS:85055981874

SN - 1996-1944

VL - 11

JO - Materials

JF - Materials

IS - 11

M1 - 2189

ER -

Characterization and corrosion resistance of boron-containing-austenitic stainless steels produced by rapid solidification techniques

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Keywords

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