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Title: Laser surface hardening of AISI 1055 steel in water submerged condition
Authors: Zhou, Wei
Zhou, Yu
Wu, Naien
Maharjan, Niroj
Keywords: Laser Surface Hardening
DRNTU::Engineering::Mechanical engineering
Issue Date: 2019
Source: Maharjan, N., Zhou, W., Zhou, Y., & Wu, N. (2019). Laser surface hardening of AISI 1055 steel in water submerged condition. Surface Review and Letters, 1950087-94. doi:10.1142/S0218625X19500872
Series/Report no.: Surface Review and Letters
Abstract: Underwater laser hardening might produce better surface mechanical properties than conventional laser hardening in air due to additional cooling effect by water. However, it has not been studied in detail. This study investigates the effect of water layer on laser surface hardening of AISI 1055 steel. It is found that laser surface hardening is feasible with water layer up to 3 mm above the steel surface. A higher surface hardness is achieved during underwater processing. This is attributed to fast cooling by water which facilitates complete martensitic transformation. Nevertheless, the hardened area is smaller than that in conventional laser hardening in air due to attenuation of laser energy. Above 3 mm, the laser beam is severely attenuated due to formation of vapor plume. Furthermore, it is found that surface oxidation cannot be prevented completely even during underwater treatment, and the water movement results in random distribution of metal slag on the surface.
ISSN: 0218-625X
Rights: Electronic version of an article published as Surface Review and Letters, 2019, 1950087-94. @ copyright World Scientific Publishing Company
Fulltext Permission: embargo_20200410
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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