Microstructure of Spray Formed 2.9%C-22%Cr High Chromium White Cast Iron

Kasama, A.H.; Cava, R.D.; Mourisco, Aroldo; Kiminami, Cláudio Shyinti; Bolfarini, Claudemiro

doi:10.4028/www.scientific.net/msf.416-418.419

Cited by 7 publications

(8 citation statements)

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“…Some researchers [4,5,12] have studied the spray-forming process in high-chromium white cast iron alloys and obtained extremely refined microstructures with fine M 7 C 3 -type carbides homogeneously dispersed in the austenitic and martensitic matrix. In the rolling/sliding configuration, Hanlon et al [4] found that the wear rate of conventionally produced material was significantly higher than that of spray-cast material when tested at 20-500 • C. Guo et al [5] reported that, in a pin-on-disk test, spray-formed material showed better fracture resistance than sand-cast materials.…”

Section: Introductionmentioning

confidence: 99%

“…Many researches have focused on the behavior of abrasion wear in white cast iron high-chromium alloys [1][2][3][4][5][6][7][8][9][10][11][12]. A variety of microstructural factors, e.g., the type of carbide, hardness, volumetric fraction of carbide, distance between carbides and matrix structure, strongly affect the wear of these materials.…”

Section: Introductionmentioning

confidence: 99%

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Sliding wear of spray-formed high-chromium white cast iron alloys

Matsuo

Kiminami

et al. 2005

Wear

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sliding wear of spray-formed high-chromium white cast iron alloys

Matsuo

Kiminami

et al. 2005

Wear

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“…Regarding the wear mechanism, on the basis of available sources [59,60], it was found that at the carbide/matrix phase interface or at splat or pore boundaries, a crack initiates due to friction, which subsequently propagates through the surface layer of the material. This then leads to the formation of macrocracks in plastically deformed regions due to local plasticity depletion [61]. Subsequently, with further wear, delamination of the surface occurs [39].…”

Section: Tribological Behaviourmentioning

confidence: 99%

Effect of Laser Remelting of Fe-Based Thermally Sprayed Coating on AZ91 Magnesium Alloy on Its Structural and Tribological Properties

Buchtík,

Březina,

Mrňa

et al. 2023

Coatings

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An Fe-based coating was thermally sprayed onto the surface of AZ91 magnesium alloy via the High-Velocity-Oxygen-Fuel (HVOF) method. The thermally sprayed coating with a thickness of 530 ± 25 µm and a porosity of 0.7 ± 0.1% did not show any macrostructural defects and did not cause any degradation of the AZ91 alloy. Laser remelting of the surface layer of the sprayed coating resulted in the recrystallization of the structure and the disappearance of presented pores, splat boundaries, and other defects. This led to an increase in the hardness of the remelted layer from the original 535 ± 20 HV0.3 up to 625 ± 5 HV0.3. However, during the laser remelting at a laser power of 1000 W, stress cracking in the coating occurred. The tribological properties were evaluated by the ball-on-plate method under dry conditions. Compared to the uncoated AZ91 magnesium alloy, a higher value of friction coefficient (COF) was measured for the as-sprayed coating. However, there was a decrease in wear rate and weight loss. The remelting of the surface layer of the as-sprayed coating led to a further decrease in the wear rate and weight loss. Based on the obtained data, it has been shown that the application of laser-remelted thermally sprayed Fe-based coatings on AZ91 Mg alloy improves hardness and tribological properties compared to bare Mg alloy and as-sprayed Fe-based coatings.

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“…nvolves the conversion of a liquid metal stream into variously sized droplets, which are then propelled away from the region of atomization [1] by the fast flowing, atomizing gas. The droplet trajectories are interrupted by a substrate which collects and solidifies the droplets into a coherent, near fully dense deposit [2][3][4][5]. By continuous movement of the substrate relative to the atomizer as deposition proceeds, large deposits can be produced in a variety of geometries including deposits, tubes and strips [2].…”

Section: Spray Forming Via Gas Atomization Imentioning

confidence: 99%

Gas Atomization of Nanocrystalline Fe63Nb10Al4Si3B20 Alloy

Afonso

Kaufman

Bolfarini

et al. 2004

JMNM

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Powder of Fe 63 Nb 10 Al 4 Si 3 B 20 (%at) alloy was processed by gas atomization to investigate the formation of novel microstructures due to the high cooling rates involved in this process. The ratio between the gas volumetric flow rate and the metal mass flow rate used was 0.23, and nitrogen was used as the atomization gas. The powder, with a median particle diameter about 120µm, was sieved in the granulometric size ranges of 5-20, 20-30, 30-45, 45-75, 75-106, 106-150, 150-180, >180µm, and then were characterized by X-ray diffratometry (XRD), differential scanning calorimetry (DSC), scanning and transmission electron microscopy (SEM and TEM, respectively) both equipped with energy dispersive spectroscopy (EDS). Powder in the range of 5-45µm contain α-Fe nanocrystals embedded in an amorphous matrix. In the size range of 45-150µm, the powder contains, besides α-Fe nanocrystals embedded in an amorphous matrix, particles of FeB and Fe 23 B 6 intermetallic phases. For the size range > 150µm, the powder showed particles with Fe-α nanocrystals embedded in an amorphous matrix and partially crystalline particles with Fe-α, FeNbB and FeB phases. The volume fraction of the amorphous phase decreased with the increase of the granulometric size range. The nanocrystallization of the powder in the smaller size ranges opens the possibility for the production of a bulk nanocrystalline deposit produced by spray forming and its application as a soft ferromagnet.

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Microstructure of Spray Formed 2.9%C-22%Cr High Chromium White Cast Iron

Cited by 7 publications

References 0 publications

Sliding wear of spray-formed high-chromium white cast iron alloys

Sliding wear of spray-formed high-chromium white cast iron alloys

Effect of Laser Remelting of Fe-Based Thermally Sprayed Coating on AZ91 Magnesium Alloy on Its Structural and Tribological Properties

Gas Atomization of Nanocrystalline Fe<sub>63</sub>Nb<sub>10</sub>Al<sub>4</sub>Si<sub>3</sub>B<sub>20</sub> Alloy

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