Microstructural analysis of Zr55Cu30Al10Ni5 bulk metallic glasses by laser surface remelting and laser solid forming

Zhang, Yuanyuan; Lin, Xin; Wang, Lilin; Wei, Lei; Liu, Fenggang; Huang, Weidong

doi:10.1016/j.intermet.2015.06.007

Cited by 67 publications

(25 citation statements)

References 26 publications

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“…Laser remelting is considered as an effective post treatment to improve the quality and properties of coatings. It has been extensively adopted to prepare coatings with a dense structure and excellent properties [16][17][18][19][20]. Therefore, laser remelting can be attempted to decrease or even eliminate the cracks in the laser forming repaired (LFRed) K417G.…”

Section: Introductionmentioning

confidence: 99%

Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy

Liu

Wang

et al. 2019

Coatings

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The K417G Ni-based superalloy is widely used in aeroengine turbine blades for its excellent properties. However, the turbine blade root with fir tree geometry experiences early failure frequently, because of the wear problems occurring in the working process. Laser forming repairing (LFR) is a promising technique to repair these damaged blades. Unfortunately, the laser formed Ni-based superalloys with high content of (Al + Ti) have a high cracking sensitivity. In this paper, the crack characterization of the laser forming repaired (LFRed) K417G—the microstructure, microhardness, and tribological properties of the coating before and after laser remelting—is presented. The results show that the microstructure of as-deposited K417G consists of γ phase, γ′ precipitated phase, γ + γ′ eutectic, and carbide. Cracking mechanisms including solidification cracking, liquation cracking, and ductility dip cracking are proposed based on the composition of K417G and processing characteristics to explain the cracking behavior of the K417G superalloy during LFR. After laser remelting, the microstructure of the coating was refined, and the microhardness and tribological properties was improved. Laser remelting can decrease the size of the cracks in the LFRed K417G, but not the number of cracks. Therefore, laser remelting can be applied as an effective method for strengthening coatings and as an auxiliary method for controlling cracking.

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Section: Introductionmentioning

confidence: 99%

Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy

Liu

Wang

et al. 2019

Coatings

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“…During the multi-pass scanning of the laser, the deposited layer is subjected to reheating, and amorphous crystallization occurs easily. Thus, it is difficult to obtain fully amorphous structures by laser 3D printing [15]. The rapid heating and cooling during laser 3D printing inevitably induces a large temperature gradient, inducing high thermal stress which creates defects in the 3D printed samples [13].…”

Section: Introductionmentioning

confidence: 99%

Brittle-Ductile Transition in Laser 3D Printing of Fe-Based Bulk Metallic Glass Composites

Xie

Chen

Gao

2019

Metals

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The effects of the α-Fe phase on mechanical properties and cracking of laser 3D printing Fe-based bulk metallic glass composites were investigated. The elastic recovery and plasticity index were characterized by nanoindentation. As the volume fraction of the α-Fe phase increases from 23.66% to 52.38%, the elastic modulus of printed samples suddenly drops. The samples exhibit a lower deformation resistance, and the plasticity index increases gradually. When the volume fraction of the α-Fe phase is 67.84%, the interaction between the α-Fe phase and matrix phase is smaller during expansion shrinkage. As a result, cracking is easy to initiate, which leads to the highest crack rate of the printed sample. However, as the volume fraction of the α-Fe phase increases to 83.31%, the hard brittle phase was sandwiched between the α-Fe phases similar to the finger structure plays key role in the plastic deformation. The plastic deformation releases large amounts of stress concentrated at the boundary and suppresses crack formation.

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“…In addition, laser remelting was considered as an effective method to improve the surface quality and properties of cladding coating. It has been extensively adopted to prepare the amorphous coatings with dense structure and excellent properties [30][31][32][33]. However, to the authors' knowledge, the research of combining laser cladding with laser remelting to prepare WC reinforced amorphous composite coatings is rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of laser remelting on microstructure and properties of WC reinforced Fe-based amorphous composite coatings by laser cladding

Zhou

Liao

et al. 2018

Optics & Laser Technology

140

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The WC reinforced Fe-based amorphous composite coatings were prepared by laser cladding with rectangular spot. The effect of laser remelting on the microstructure and properties of composite coatings was investigated. The results showed that laser remelting can reduce the cracks and porosities of the cladding coating and improve its surface quality. Large amounts of crystalline phases were precipitated at the top of the cladding and remelting coatings. However, the microstructure at the top of the remelting coating was finer compared to that at the top of the cladding coating. With increasing distance from the surface of substrate, the amorphous phase appeared within the remelting coating and large amounts of carbides rich in Fe and Mo, Fe 23 B 6 , c-Fe and Cr 9.1 Si 0.9 phases were also precipitated in the remelting coating. As a result, the corrosion resistance of the remelting coating was higher than that of the cladding coating. The microhardness of the remelting coating was approximately 1.13 times higher than that of the cladding coating.

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Microstructural analysis of Zr55Cu30Al10Ni5 bulk metallic glasses by laser surface remelting and laser solid forming

Cited by 67 publications

References 26 publications

Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy

Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy

Brittle-Ductile Transition in Laser 3D Printing of Fe-Based Bulk Metallic Glass Composites

Effect of laser remelting on microstructure and properties of WC reinforced Fe-based amorphous composite coatings by laser cladding

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