Microstructure and wear-resistance of Fe-Cr-B base metamorphic alloys

Jin, H.W.; Rhyim, Young-Mok; Park, C. G.; Kim, M. C.

doi:10.1007/bf03026107

Cited by 26 publications

(20 citation statements)

References 9 publications

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“…It seems that HVOF spraying of Armacor 16 powder causes the oxidation of the alloy. Investigation of D-gun sprayed Armacor 16 coating revealed that these oxide inclusions contained a large amount of B and Si [10,11]. It is also confirmed that the dark contrast is a Cr-rich chromium-iron boride, and that the light contrast is a Fe-rich Fe-Cr solid solution in the SEM cross-section of the Armacor 16 coating.…”

Section: Characteristics Of the Feedstock Powdersmentioning

confidence: 63%

“…This surface structure is only a few microns deep. Recent investigations confirm this martensitic transformation on the uppermost worn layer using TEM (Transmission Electron Microscopy) analysis [9][10][11][12]. While wear in one direction results in an amorphous matrix bonding, a large volume fraction of whisker-like nanocrystals all aligned in the direction of wear, random wear in several directions results in a completely amorphous surface layer.…”

Section: Introductionmentioning

confidence: 83%

“…Note that the presence of the amorphous phase is not seen in the XRD patterns for both powders. Previous investigation of Armacor 16 powder has shown the presence of needle-shape chromium-iron boride in the Fe-Cr-Ni solid solution matrix using an Auger electron microscope [11 ]. Fig.…”

Section: Characteristics Of the Feedstock Powdersmentioning

confidence: 98%

“…While wear in one direction results in an amorphous matrix bonding, a large volume fraction of whisker-like nanocrystals all aligned in the direction of wear, random wear in several directions results in a completely amorphous surface layer. Jin et al explain this crystalline-toamorphous transition behavior during wear as a solid state amorphization reaction [11,13]. The utilization of these coatings can obviate the great effort and difficulty of coating processes or alloy compositions that are required to obtain large fractions of the amorphous phase in the assprayed coatings.…”

Section: Introductionmentioning

confidence: 98%

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Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

Grossi

Kweon

1999

Metals and Materials

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Two Fe-Cr-B based gas atomized powders, Armacor M and 16, were thermally sprayed on a low carbon steel substrate, using the HVOF (High Velocity Oxygen Fuel) process. Armacor M was also weld-surfaced with the PTA (Plasma Transferred Arc) process. The resultant deposits were subsequently characterized, using X-ray diffraction, scanning electron microscopy, and microhardness measurement. The effects of heat treatment were also studied for HVOF-sprayed coatings. The wear performance of the coatings was investigated by two-body abrasive wear tests. The results of microstructural analysis of as-sprayed deposits revealed oxide and boride phases such as Fe304 and Crl.65Feo.35Bc~.~, in an ~ matrix for the HVOF-sprayed Armacor 16 coating, and only the boride phases (Cr1.65F%35B0.~6 and Cr~B) in an tx matrix for the HVOFsprayed Armacor M coating. PTA weld-surfaced Armacor M coating contains needle-type long precipitates of Cr~B and Crl.65Fe0.3~B~).9~, in the a matrix. The hardness of the HVOF-sprayed Armacor 16 coating after heat treatment was substantially less than that of the as-sprayed coating due to the phase transformation from tx to y phase. Heat treatments of the HVOF-sprayed Armacor M coating did not produce changes in phase and its hardness decreased as compared to that of the as-sprayed coating. While HVOF-sprayed and PTA weld-surfaced Armacor M coatings have the same hardness, the latter shows better abrasive wear resistance because of the size and orientation of its boride phases. The broadening of the XRD patterns and the increase in hardness after wear testing suggest that the transformation from the crystalline to the amorphous structure occurred on the uppermost layer during wear testing.

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Section: Characteristics Of the Feedstock Powdersmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 83%

Section: Characteristics Of the Feedstock Powdersmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

Grossi

Kweon

1999

Metals and Materials

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“…Scruggs [1]. They have been reported to exhibit excellent sliding and abrasive wear resistance [2,3]. Therefore, they are good candidates for parts subjected to dry surface sliding such as bearings, shafts and other rotating equipment parts.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Tribology of Spark Plasma Sintered Fe–Cr–B Metamorphic Alloy Powder

et al. 2011

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The spark plasma sintering (SPS) process was used to fabricate a bulk Fe-Cr-B alloy (known as Armacor M) from gas-atomized powders. The purpose of this work is to study the microstructure, hardness and tribology of this sintered bulk alloy. Post microstructure and mechanical characterizations were performed to investigate the effects of wear on the microstructure and mechanical properties. Microstructural analysis using X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) showed that SPS successfully produced a fully dense bulk material containing 67 vol.% Cr 1.65 Fe 0.35 B 0.96 particles dispersed in 33 vol.% solid solution matrix consisting of Fe, Cr and Si. Using nanoindentation, the hardness of the Cr 1.65 Fe 0.35 B 0.96 particles and the matrix was found to be 24 and 6 GPa, respectively. From microindentation, the bulk hardness of the sintered alloy was 9.7 GPa (991 HV). Dry sliding wear testing under mild conditions (i.e., initial Hertzian mean contact pressure of 280 MPa) was conducted against a stainless steel pin. The steady state coefficient of friction against Armacor M was about 0.82. The wear of Armacor M proceeded primarily by adhesive and mild oxidative wear. The wear volume for Armacor M was 80% less than that of carbon steel and its wear rate was 5.53 9 10 -6 mm 3 N -1 m -1 .

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Correlation of microstructure with hardness and wear resistance of surface composites fabricated by high-energy electron beam irradiation of Fe-based metamorphic powders

Lee

Nam

Lee

et al. 2006

Metall Mater Trans A

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In this study, surface composites were fabricated with Fe-based metamorphic powders by high-energy electron beam irradiation, and the correlation of their microstructure with hardness and wear resistance was investigated. Fe-based metamorphic powders were deposited on a plain carbon steel substrate, and then electron beam was irradiated on these powders without flux to fabricate a one-layered surface composite. A two-layered surface composite was also fabricated by irradiating electron beam again onto the powders deposited on the one-layered surface composite. The composite layers of 1.3;1.9 mm in thickness were homogeneously formed without defects and contained a large amount (up to 48 vol pct) of hard and fine Cr 2 B crystalline phases in the Cr 0.19 Fe 0.7 Ni 0.11 matrix. Since the hardness and wear resistance of the surface composite layers were directly influenced by hard Cr 2 B phases, they were two to three times greater than those of the steel substrate. In particular, the twolayered surface composite showed a high hardness of ;300 VHN even at 750°C, as well as at room temperature, because Cr 2 B phases and the Cr 0.19 Fe 0.7 Ni 0.11 matrix were hard and thermally stable.

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Microstructure and wear-resistance of Fe-Cr-B base metamorphic alloys

Cited by 26 publications

References 9 publications

Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

Microstructure and Tribology of Spark Plasma Sintered Fe–Cr–B Metamorphic Alloy Powder

Correlation of microstructure with hardness and wear resistance of surface composites fabricated by high-energy electron beam irradiation of Fe-based metamorphic powders

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