Efecto del calor aportado en recargues nanoestructurados base hierro

In the last years several consumables which deposit hard nanostructured iron-based alloys with high resistance to abrasive wear have been developed. The microstructure of the weld metal usually shows variations with the welding procedure, particularly related to the heat input, number of layers and shielding gas type. The purpose of this work was to study the microstructural evolution and wear resistance of a nanostructured iron-based alloy deposited by FCAW process. Four samples with one and two layers were deposited under Ar-20%CO 2 shielding and without shielding gas, using a heat input of 3.5 kJ/mm. For each condition chemical composition was determined and microstructure was studied using both optical and electronic microscopy and X ray diffraction. Microhardness and abrasive wear resistance were measured. The microhardness of the deposit was found between 780 and 1020 HV 2 , depending on the number of layers. There was a variation of the chemical composition between the first and the second layer. The wear test results were discussed in relation to chemical composition, microstructure and microhardness.

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Transformation of the nickel aluminide alloy structure through the application of a heat-resistant coating using oscillation electrode surfacing

Zorin,

Lysak,

Kharlamov

et al. 2023

Izv. VUZ. Poroshk. Met.

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This study considers the formation of an alloyed nickel aluminide structure through automatic electric arc surfacing employing an oscillating electrode composed of composite wire. The arc transversely traverses the weld pool surface at a frequency denoted as f. In comparison to conventional surfacing techniques, this process either displaces the crystallization front alongside the weld pool (at f  = 1.3 Hz) or stabilizes it (at f  ≥ 2 Hz) throughout the cross-sectional area of the coating layer. We have conducted an investigation into the evolution of alloy structures resulting from surfacing. Notably, we have observed that the regions with concentrations of eutectic nickel-aluminum are particularly susceptible to structural alterations. The formation of particle clusters, which is contingent upon heat dissipation conditions near the crystallization front, leads to the development of layered texture regions. Our findings reveal that following 50 thermal cycles (heating to 1100 °C, cooling to 25 °C), the alloy's hardness becomes independent of subsequent thermal cycles, consistently maintaining a level 34–35 HRC. The highest resistance of the surfaced metal to thermal fatigue cracks is achieved when its structure exhibits an optimal γ-solid solution (relatively ductile) to nickel-aluminum cooling martensite ratio, corresponding to the Ni2Al phase. The thermal conditions necessary for producing such a structure are elucidated by the gradual cooling of the crystallized metal from elevated temperatures when f  ≥ 2.8 Hz. An analysis of changes in oxidative wear, estimated by mass loss, during thermal fatigue tests conducted at a metal heating temperature of 1100 °C revealed the superiority of the studied alloy over industrial alloys based on nickel and cobalt.

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Efecto del calor aportado en recargues nanoestructurados base hierro

Abstract: Resumen En los últimos años se han desarrollado consumibles de soldadura que depositan recubrimientos duros de aleaciones base hierro nanoestructuradas de gran resistencia al desgaste abrasivo. Las resistencias al desgaste erosivo y abrasivo están controladas

Cited by 4 publications

References 10 publications

Wear Resistance of Fe-based Nanostructured Hardfacing

Wear Resistance of Fe-based Nanostructured Hardfacing

Study of abrasive wear resistance of Fe-based nanostructured hardfacing

Transformation of the nickel aluminide alloy structure through the application of a heat-resistant coating using oscillation electrode surfacing

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