Abstract
FeCoCrNiMnAlx high-entropy alloy (HEA) cladding layers were successfully fabricated on H13 steel by laser cladding. The microstructure and properties of the FeCoCrNiMnAlx HEA cladding layers were systematically studied. The influence of Al content on high-temperature wear resistance of HEAs was investigated by depth-of-field microscopy, XRD, SEM and EDS. Addition of Al element affected the mechanism of oxidation and strengthening of the cladding layers, and effectively promoted its anti-oxidant and abrasion resistance. Compared with the FeCoCrNiMn cladding layer, the FeCoCrNiMnAl0.75 cladding layer enhanced the anti-plastic deformation capacity by 7.1% and reduced oxidation weight gain and total wear weight loss at high temperature by 36.79% and 79.0%, respectively. The wear mechanisms of the cladding layer at high temperature were mainly oxidation wear and abrasive wear, while adhesive wear took a backseat.
Highlights
Due to high-entropy [1], severe lattice distortion [2], sluggish diffusion [3] and cocktail effects [4], high-entropy alloys (HEAs) have excellent properties such as high hardness, high wear resistance, high-temperature resistance and high specific strength [5,6,7,8,9]
Joseph et al [14] studied the influence of Al content on the high-temperature wear resistance of Alx CoCrFeNi (x = 0, 0.3, 0.6, 1) HEAs
The results indicate that AlCoCrFeNi HEA had an ultra-high microhardness (630 HV3 ) and the highest wear resistance at room temperature due to formation of dense oxide films and grain refinement of the subsurface
Summary
Due to high-entropy [1], severe lattice distortion [2], sluggish diffusion [3] and cocktail effects [4], high-entropy alloys (HEAs) have excellent properties such as high hardness, high wear resistance, high-temperature resistance and high specific strength [5,6,7,8,9]. Joseph et al [14] studied the influence of Al content on the high-temperature wear resistance of Alx CoCrFeNi (x = 0, 0.3, 0.6, 1) HEAs. The results indicate that AlCoCrFeNi HEA had an ultra-high microhardness (630 HV3 ) and the highest wear resistance at room temperature due to formation of dense oxide films and grain refinement of the subsurface. LC is characterized by high energy density, fast cooling speed, small heat input, low dilution rate of cladding layer and small thermal impact on matrix [15,16] It can achieve surface modification of materials and reduce the cost of processing [17,18]. This investigation systematically studied high-temperature oxidation and wear properties of FeCoCrNiMnAlx laser coatings, and the influence of Al content on mechanisms of high-temperature oxidation and wear were discussed in detail
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