Effect of the remelting scanning speed on the amorphous forming ability of Ni-based alloy using laser cladding plus a laser remelting process

Li, Ruifeng; Jin, Yanchao; Li, Zhuguo; Zhu, Yanyan; Wu, Mingyang

doi:10.1016/j.surfcoat.2014.09.067

Cited by 61 publications

(19 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thermal physical properties of the substrate and the cladding alloys were obtained from a reference paper. 17 Heat-flow density was loaded through the form of surface heat source F (F = h × P/A) is the absorpti-vity, A is the laser spot area (5 × 5 mm 2 ), P is the laser power). The governing equation of the heat conduction in Cartesian coordinates is given by:…”

Section: Fe Simulations and Analysismentioning

confidence: 99%

Effects of heat inputs on the structure of Ni-based amorphous composite coatings applied with laser cladding

Li¹,

Chen²,

Gu³

et al. 2019

Mater. Tehnol.

View full text Add to dashboard Cite

In this paper, Ni-based amorphous composite coatings were fabricated under different heat inputs on a mild-steel substrate using laser cladding with coaxial powder feeding. The microstructure of the coating was studied using a scanning electron microscope (SEM), X-ray diffraction (XRD) and transmission electron microscope (TEM). The effects of the heat inputs on the amorphous-phase forming ability of the Ni-based alloy was investigated systematically with experimental and numerical simulation methods. The results show that there was no amorphous phase in the coating when the heat input was 131.3 J/mm. The amorphous-phase fraction increased with a decrease in the laser-cladding heat inputs from 81.3 J/mm to 50.0 J/mm. Then a 3D thermal finite-element (FE) model was built to simulate the temperature field of coaxial laser cladding at different heat inputs using the element birth and death technique. Detailed 3D transient thermal analyses were performed on temperature-dependent material properties. The proposed model was validated with the experimental results. It was found that a decrease in the heat input leads to a lower high-temperature residence time and a higher cooling rate of the melted pool. Consequently, a low heat input can be considered as a necessary condition for the formation of the amorphous phase during the laser-cladding process.

show abstract

Section: Fe Simulations and Analysismentioning

confidence: 99%

Effects of heat inputs on the structure of Ni-based amorphous composite coatings applied with laser cladding

Li¹,

Chen²,

Gu³

et al. 2019

Mater. Tehnol.

View full text Add to dashboard Cite

show abstract

“…As well known, the addition of Cr, Mo or W can improve the corrosion resistance of amorphous coatings [33]. For example, Farmer et al [47,48] proposed the formula of PREN (pitting resistance equivalence number) that can be used to evaluate the corrosion resistance of alloys and amorphous coatings.…”

Section: Electrochemical Corrosion Of Coatingsmentioning

confidence: 99%

“…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

167

View full text Add to dashboard Cite

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.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Effect of the remelting scanning speed on the amorphous forming ability of Ni-based alloy using laser cladding plus a laser remelting process

Cited by 61 publications

References 30 publications

Effects of heat inputs on the structure of Ni-based amorphous composite coatings applied with laser cladding

Effects of heat inputs on the structure of Ni-based amorphous composite coatings applied with laser cladding

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

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

Contact Info

Product

Resources

About