Effects of Robotic Hammer Peening on Structural Properties of Ni-Based Single-Crystal Superalloy: Dislocation Slip Traces and Crystallographic Reorientations

Liu, Hongfei; Tan, Chee Kiang Ivan; Cheng, Wei; Lim, Guo Wei; Tan, Dawn T. H.; Lee, Coryl J.; Cheng, Jayce Jian Wei; Cheng, Henry Kuo Feng; Lee, Louiz C.

doi:10.1007/s11661-020-05734-z

Cited by 20 publications

(2 citation statements)

References 33 publications

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“…The coupons were mechanically polished by using SiC sandpapers and the mechanical polishing was started with 500‐grit sandpaper followed by 800–1,200–2,400‐grit ones in sequence. [ 17 ] After surface polishing, the coupons were cleaned by sonication in isopropyl alcohol (IPA) and deionized water and then dried by flowing nitrogen. A salt mixture of Na 2 SO 4 and MgSO 4 (47:53 in mole ratio) was dissolved in deionized water and the salt solution (0.02 M) was sprayed on the coupons at 90°C to form a uniform coating.…”

Section: Methodsmentioning

confidence: 99%

Hot corrosion studies of a salt‐coated Ni‐based superalloy under flowing wet air and sulfur vapor ambient

Liu

Chen

Tan

et al. 2020

Materials & Corrosion

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Corrosion of a salt-coated Ni-superalloy has been studied at 900°C under a wet air and sulfur vapor ambient. The corrosion thickness, after an incubation of~60 hr, linearly increases with the corrosion time t and the onset of surface spallation occurred at t ≈ 60 hr. The corroded layer consists of a corrosion front dominated by Cr 3 S 4 scales and linear precipitate structures, an inner corrosion layer dominated by Ni 3 S 2 and NiO, and an outer corrosion layer dominated by Al 2 O 3 networks surrounding the Ni 3 S 2 and/or NiO scale structures. The corrosion mechanism is discussed based on the coexistence of H 2 O, sulfur, and oxygen.

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Section: Methodsmentioning

confidence: 99%

Hot corrosion studies of a salt‐coated Ni‐based superalloy under flowing wet air and sulfur vapor ambient

Liu

Chen

Tan

et al. 2020

Materials & Corrosion

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“…Because of the feasible integrations of the laserbased process, hybrid process method has recently been proposed to manufacture metal alloy components with enhanced overall integrity. A typical example is to introduce cold-working, e.g., robotic hammer peening (RHP) [28][29][30], rolling [31][32][33], LSP [34][35][36], etc., as an inter-pass process into LC, in which the LC contributes the material build-up while the cold-working potentially closes the pores, compensates the tensile stress, refines the grains, etc., via introducing plastic deformation of the individual LC-deposited layers. On the other hand, HEA has attracted increasing interest since its advent in 2004, however, some of the elements, e.g., Co, Ni, etc., are quite expensive and cost-ineffective for casting bulk HEAs.…”

Section: Introductionmentioning

confidence: 99%

Laser-based Process Towards Advanced Manufacturing of Metal Alloys

Gong

Liu

2023

J. Phys.: Conf. Ser.

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Investigations on application of laser for manufacturing and remanufacturing have been extensively progressed since its advent in 1960. The rapid development of laser technologies in the past half-century has made many laser-based direct-energy processes possible and, nowadays, most of such laser-processing techniques are about entering industrial applications. An application of laser-cladding (LC) for remanufacturing turbine blades can save the cost by over 75%. Laser treatment, on the other hand, making use of direct laser-matter interactions, has been recognized as a green surface-cleaning technique for metal alloys, which may also introduce surface integrity enhancement for additively manufactured alloys. Here, we present and discuss recent progress in laser-based process through a few typical cases that have been recently developed in our group towards advanced remanufacturing of metallic alloys, typically including LC, laser treatment, and laser-shock peening.

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