Parameter optimization of laser cladding process and resulting microstructure for the repair of tenon on steam turbine blade

Lin, Chun-Ming

doi:10.1016/j.vacuum.2015.02.021

Cited by 40 publications

(11 citation statements)

References 21 publications

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“…Because of the severe working environment, Inconel 718 components usually fail due to the occurrence of erosion, wear, corrosion, and fracture in long-term service conditions [2,[13][14][15]. Based on the concept of green, economic, and environmental protection, these failed components can be repaired by laser additive remanufacturing techniques [16][17][18][19]. Onuike et al [20] repaired the Inconel 718 parts with four different scan patterns and studied the wear properties of the repaired samples in different heat treatment conditions.…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion and Mechanical Performance of Repaired Inconel 718 Components via Laser Additive Manufacturing

Zhang

Zhuang

et al. 2020

Materials

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Hot corrosion is one of the crucial failure modes of Ni-based superalloy components operating at high temperatures, which inevitably affects the subsequent mechanical properties of the alloys. In this research, damaged Inconel 718 alloy components with a pre-made trapezoid groove are repaired using laser additive manufacturing technique, and the change mechanisms of the microstructure and tensile properties of the repaired Inconel 718 alloy due to the hot corrosion in the salt mixture of 87.5 wt.% Na2SO4 + 5 wt.% NaCl + 7.5 wt.% NaNO3 at 650 °C for different durations are investigated. The results show that oxidation and Cr-depletion occur on the repaired components due to the hot corrosion, and the corrosion products are mainly composed of Cr2O3, Fe3O4, and Ni3S2. The tensile strength and elongation of the as-repaired specimens are 736.6 MPa and 12.5%, respectively. After being hot corroded for 50 h, the tensile strength increases to 1022.9 MPa and elongation decreases to 1.7%. However, after being hot corroded for 150 h, both tensile strength and elongation of the repaired specimens drop to 955.8 MPa and 1.2%, respectively. The mechanical performance alteration is highly related to thermal effects instead of the molten salt attack.

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Section: Introductionmentioning

confidence: 99%

Hot Corrosion and Mechanical Performance of Repaired Inconel 718 Components via Laser Additive Manufacturing

Zhang

Zhuang

et al. 2020

Materials

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“…The results showed that the wear resistance of rails was improved and the RCF life was increased by laser cladding. Lin et al [20] used the Taguchi analysis method to optimize the process parameters in laser cladding iron-based powder, and the optimized process parameters were used in the laser cladding of the surface of a turbine blade. The results showed that the tensile property was improved, which could be improved even further by tempering treatment.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cobalt on Microstructure and Wear Resistance of Ni-Based Alloy Coating Fabricated by Laser Cladding

Wang

Chang

Liu

et al. 2017

Metals

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Abstract:Ni-based alloy powders with different contents of cobalt (Co) have been deposited on a 42CrMo steel substrate surface using a fiber laser. The effects of Co content on the microstructure, composition, hardness, and wear properties of the claddings were studied by scanning electron microscopy (SEM), an electron probe microanalyzer (EPMA), X-ray diffraction (XRD), a hardness tester, and a wear tester. The results show that the phases in the cladding layers are mainly γ, M 7 (C, B) 3 , M 23 (C, B) 6 , and M 2 B. With the increase in Co content, the amounts of M 7 (C, B) 3 , M 23 (C, B) 6 , and M 2 B gradually decrease, and the width of the eutectic structure in the cladding layer also gradually decreases. The microhardness decreases but the wear resistance of the cladding layer gradually improves with the increase of Co content. The wear resistance of the NiCo30 cladding layer is 3.6 times that of the NiCo00 cladding layer. With the increase of Co content, the wear mechanism of the cladding layer is changed from abrasive wear to adhesive wear.

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“…Indeed, many studies reported that laser cladding allows to obtain very low heat-affected zone compared to other surfacing technics like Plasma Transferred Arc [2]. Nevertheless, a local chemical dilution between the melted powder and the melted substrate during laser cladding is necessary since the bonding coating/substrate is directly linked to the existence and thickness of this dilution zone [3]. The dilution is defined as the ratio of cladding depth to the sum of cladding height and cladding depth.…”

Section: Introductionmentioning

confidence: 99%

Laser cladding of Ni based powder on a Cu-Ni-Al glassmold: Influence of the process parameters on bonding quality and coating geometry

Bourahima

Helbert

Rege

et al. 2019

Journal of Alloys and Compounds

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et al.. Laser cladding of Ni based powder on a Cu-Ni-Al glassmold: Influence of the process parameters on bonding quality and coating geometry. a b s t r a c tLaser cladding of a Ni based powder on cupro-nickel-aluminum (Cu-Ni-Al) substrate was performed with a 4 kW continuous laser. The Cu-Ni-Al alloy is used for its thermal properties in glass mold industry. The role of the Ni based alloy clad is to protect the mold without affecting its thermal properties by limiting the heat-affected zone. The objective of this research is to produce a well bonded Ni based melted powder without pores or cracks and with a very small dilution zone on a non-planar surface (curved section). The impact of the process parameters such as laser power, scanning speed and powder feeding rate on the coating geometry was investigated with an experimental design technique analysis using the ANOVA (Analysis of variance) method. It was used to determine and represent the influence of each process parameter on the coating geometry (width, height) and the bonding quality. This ANOVA analysis led to a parameter combination to optimize the bonding quality between the Ni coating and the Cu-Ni-Al substrate taking into account the industrial geometrical constraints. More, an analytical calculation allowed to estimate the power necessary for bonding as a function of laser scanning speed and powder feeding rate.

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Parameter optimization of laser cladding process and resulting microstructure for the repair of tenon on steam turbine blade

Cited by 40 publications

References 21 publications

Hot Corrosion and Mechanical Performance of Repaired Inconel 718 Components via Laser Additive Manufacturing

Hot Corrosion and Mechanical Performance of Repaired Inconel 718 Components via Laser Additive Manufacturing

Effect of Cobalt on Microstructure and Wear Resistance of Ni-Based Alloy Coating Fabricated by Laser Cladding

Laser cladding of Ni based powder on a Cu-Ni-Al glassmold: Influence of the process parameters on bonding quality and coating geometry

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