scholarly journals Characterization and Corrosion Resistance of Boron-Containing-Austenitic Stainless Steels Produced by Rapid Solidification Techniques

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2189 ◽  
Author(s):  
Guilherme Koga ◽  
Lucas Otani ◽  
Ana Silva ◽  
Virginie Roche ◽  
Ricardo Nogueira ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Velocity ◽  
Melt Spinning ◽  
Spray Deposition ◽  
High Velocity Oxygen Fuel ◽  
Copper Mold ◽  
Crystalline Phases ◽  
Copper Mold Casting ◽  
Mold Casting ◽  
Oxygen Fuel

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.

COLMONOY NO. 43HV

Alloy Digest ◽  
2008 ◽  
Vol 57 (7) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Surface Treatment ◽  
High Velocity ◽  
Base Alloy ◽  
Heat Treating ◽  
High Velocity Oxygen Fuel ◽  
Nickel Base Alloy ◽  
Nickel Base ◽  
Oxygen Fuel

Abstract Colmonoy No. 43HV comprises a nickel-base alloy recommended for hard surfacing parts to resist wear, corrosion, heat, and galling. Deposits that have moderate hardness have increased ductility and slightly less resistance to abrasion than Colmonoy 53HV. Deposits can be finished by grinding or machined with carbide tooling. Colmonoy No. 43HV is supplied as an atomized powder specially sized for application with high-velocity oxygen fuel (HVOF) systems. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance and surface qualities as well as heat treating and surface treatment. Filing Code: Ni-664. Producer or source: Wall Colmonoy Corporation.

Effect of Preparation on Glass Formation and Magnetic Properties of Nd-Fe-Co-Al-B Alloys

2000 ◽  
Vol 644 ◽  
Author(s):  
G. Kumar ◽  
J. Eckert ◽  
L.Q. Xing ◽  
A. Güth ◽  
S. Roth ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Melt Spinning ◽  
Hysteresis Loops ◽  
Liquid Region ◽  
Atomic Order ◽  
Copper Mold ◽  
Mechanically Alloyed ◽  
Copper Mold Casting ◽  
Mold Casting ◽  
Hard Magnetic Properties

AbstractThe effect of alternative preparation methods (copper mold casting, melt spinning, and mechanical attrition) on amorphization and properties of Nd57Fe20Co5Al10B8 and Nd40Fe40Co5Al8B7 alloys has been investigated. For all differently prepared samples an amorphous phase is formed upon solidification or solid sate reaction. However, the samples prepared by different processing routes exhibit different transformation behavior in thermal analysis. The cast Nd57Fe20Co5Al10B8 rod exhibits crystallization at 790 K followed by melting at 810 K. Neither appreciable endothermic reaction due to a glass transition nor a supercooled liquid region have been observed. Mechanically alloyed powders and ball-milled prealloys reveal two exothermic DSC peaks in the range of 650-850 K. The J-H hysteresis loops of samples synthesized by different routes show that the unique atomic order responsible for hard magnetic properties can only be accessed at moderate cooling rate of the melt as realized in copper mold casting. Rapidly quenched ribbons, mechanically alloyed powders and ball-milled ingots do not show hard magnetic properties at room temperature. These results indicate that amorphous samples with different local atomic order can be prepared by different processing routes.

Influence of Heat Treatment on Corrosion Resistance of High-Velocity Oxygen-Fuel Sprayed WC-17Co Coatings on 42CrMo Steel

2015 ◽  
Vol 24 (9) ◽  
pp. 3218-3227 ◽  
Author(s):  
Wan-chang Sun ◽  
Pei Zhang ◽  
Feng Zhang ◽  
Chu-xu Dong ◽  
Ju-mei Zhang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
High Velocity ◽  
High Velocity Oxygen Fuel ◽  
42Crmo Steel ◽  
Oxygen Fuel

Study on Electrochemical Property of Fe-Based Amorphous Alloys

2012 ◽  
Vol 487 ◽  
pp. 457-461
Author(s):  
Yu Fang Yang ◽  
Y. Shao
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Property ◽  
Amorphous Alloys ◽  
Nacl Solution ◽  
Copper Mold ◽  
Good Corrosion Resistance ◽  
Copper Mold Casting ◽  
Mold Casting ◽  
Hcl Solution

There are 7 Fe-based amorphous alloys fabricated by advanced copper mold casting after careful attempt. The electrochemical property of amorphous alloys was studied for investigating the physics characteristic and properties applied in practice further. The result is as follows: Amorphous alloys exhibit good corrosion resistance in NaCl solution and HCl solution, and the addition of Cr and Mo can improve the passivating ability.

Studies on Fe-Cr-Ni-Si-B Bulk Metallic Glass for Automotive Applications

2015 ◽  
Vol 1114 ◽  
pp. 68-75
Author(s):  
Mariana Lucaci ◽  
Delia Patroi ◽  
Violeta Tsakiris ◽  
Magdalena Valentina Lungu ◽  
Eugen Manta ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Metallic Glasses ◽  
Melt Spinning ◽  
Copper Mold ◽  
Technological Parameters ◽  
Glass Forming ◽  
Copper Mold Casting ◽  
Mold Casting ◽  
Melt Spin

Researches and developments were carried out for obtaining of bulk metallic glass (BMG) from the Fe-Cr-Ni-Si-B system. The used processing methods were copper mold casting and melt spinning method. The resulted materials are in form of sheets with sizes of 69.7 x 64 x 3/1.5 mm and of strips with thickness less than 50 microns, which were obtained by varying the melt spin technological parameters. The both processing variants are not suitable for obtaining such of alloy in bulk metallic glass form. Adding of zirconium to this alloy produces bulk metallic glasses only for the melt spin products. The DSC analysis emphases that the zirconium modified alloy processed by melt spinning method exhibits a high glass forming ability (GFA).

scholarly journals The Effect of Heat Treatment on the Corrosion Resistance of Fe-Based Amorphous Alloy Coating Prepared by High Velocity Oxygen Fuel Method

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7818
Author(s):  
Chun-Ying Lee ◽  
Hung-Hua Sheu ◽  
Leu-Wen Tsay ◽  
Po-Sen Hsiao ◽  
Tzu-Jing Lin ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Amorphous Alloy ◽  
High Velocity ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Alloy Coating ◽  
Corrosion Current ◽  
High Velocity Oxygen Fuel ◽  
Oxygen Fuel

In this study, Fe40Cr19Mo18C15B8 amorphous coatings were prepared using high velocity oxygen fuel (HVOF) technology. Different temperatures were used in the heat treatment (600 °C, 650 °C, and 700 °C) and the annealed coatings were analyzed by DSC, SEM, TEM, and XRD. XRD and DSC results showed that the coating started to form a crystalline structure after annealing at 650 °C. From the SEM observation, it can be found that when the annealing temperature of the Fe-based amorphous alloy coating reached 700 °C, the surface morphology of the coating became relatively flat. TEM observation showed that when the annealing temperature of the Fe-based amorphous alloy coating was 700 °C, crystal grains in the coating recrystallized with a grain size of 5–20 nm. SAED analysis showed that the precipitated carbide phase was M23C6 phase with different crystal orientations (M = Fe, Cr, Mo). Finally, the corrosion polarization curve showed that the corrosion current density of the coating after annealing only increased by 9.13 μA/cm2, which indicated that the coating after annealing treatment still had excellent corrosion resistance. It also proved that the Fe-based amorphous alloy coating can be used in high-temperature environments. XPS analysis showed that after annealing FeO and Fe2O3 oxide components increased, and the formation of a large number of crystals in the coating resulted in a decrease in corrosion resistance.

scholarly journals Mechanical behavior under nanoindentation of a new Ni-based glassy alloy produced by melt-spinning and copper mold casting

2010 ◽  
Vol 356 (43) ◽  
pp. 2251-2257 ◽  
Author(s):  
F.S. Santos ◽  
J. Sort ◽  
J. Fornell ◽  
M.D. Baró ◽  
S. Suriñach ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Melt Spinning ◽  
Glassy Alloy ◽  
Copper Mold ◽  
Copper Mold Casting ◽  
Mold Casting
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