Comparative study of laser surface hardening of 50CrMo4 steel using continuous-wave laser and pulsed lasers with ms, ns, ps and fs pulse duration

Laser surface hardening, used to achieve hardened surface without affecting bulk properties of steels, generally employs continuous-wave laser to do the job. The purpose of this paper is to systematically investigate the use of different pulsed lasers for surface hardening of 50CrMo4 steel. A contin...

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Main Authors: Maharjan, Niroj, Zhou, Wei, Zhou, Yu, Guan, Yingchun, Wu, Naien
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2019
Subjects:
Online Access:https://hdl.handle.net/10356/103419
http://hdl.handle.net/10220/48253
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1034192023-03-04T17:11:25Z Comparative study of laser surface hardening of 50CrMo4 steel using continuous-wave laser and pulsed lasers with ms, ns, ps and fs pulse duration Maharjan, Niroj Zhou, Wei Zhou, Yu Guan, Yingchun Wu, Naien School of Mechanical and Aerospace Engineering Advanced Remanufacturing and Technology Centre Laser Hardening Pulsed Laser DRNTU::Engineering::Manufacturing Laser surface hardening, used to achieve hardened surface without affecting bulk properties of steels, generally employs continuous-wave laser to do the job. The purpose of this paper is to systematically investigate the use of different pulsed lasers for surface hardening of 50CrMo4 steel. A continuous-wave laser and various pulsed lasers with pulse duration ranging from fs to ms were used for the experiment. It was found that millisecond laser utilizing about 9 times lower power is as effective as continuous-wave laser for surface hardening. It produced an average surface hardness of ~719 HV (2.7 times higher than base material hardness) and ~200 µm hardened depth, which is comparable with continuous-wave laser hardening. Similarly, nanosecond laser could induce both surface hardening effect and material removal depending on the parameters used. However, a shallow hardened depth (of mere ~80 µm) was achieved compared to continuous-wave laser. Furthermore, femtosecond and picosecond lasers did not produce any observable surface hardening effect; instead they resulted in direct surface ablation. Accepted version 2019-05-17T05:06:32Z 2019-12-06T21:12:17Z 2019-05-17T05:06:32Z 2019-12-06T21:12:17Z 2019 Journal Article Maharjan, N., Zhou, W., Zhou, Y., Guan, Y., & Wu, N. (2019). Comparative study of laser surface hardening of 50CrMo4 steel using continuous-wave laser and pulsed lasers with ms, ns, ps and fs pulse duration. Surface and Coatings Technology, 366, 311-320. doi:10.1016/j.surfcoat.2019.03.036 0257-8972 https://hdl.handle.net/10356/103419 http://hdl.handle.net/10220/48253 10.1016/j.surfcoat.2019.03.036 366 311 320 en Surface and Coatings Technology © 2019 Elsevier. All rights reserved. This paper was published in Surface & Coatings Technology and is made available with permission of Elsevier. 27 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Laser Hardening
Pulsed Laser
DRNTU::Engineering::Manufacturing
spellingShingle Laser Hardening
Pulsed Laser
DRNTU::Engineering::Manufacturing
Maharjan, Niroj
Zhou, Wei
Zhou, Yu
Guan, Yingchun
Wu, Naien
Comparative study of laser surface hardening of 50CrMo4 steel using continuous-wave laser and pulsed lasers with ms, ns, ps and fs pulse duration
description Laser surface hardening, used to achieve hardened surface without affecting bulk properties of steels, generally employs continuous-wave laser to do the job. The purpose of this paper is to systematically investigate the use of different pulsed lasers for surface hardening of 50CrMo4 steel. A continuous-wave laser and various pulsed lasers with pulse duration ranging from fs to ms were used for the experiment. It was found that millisecond laser utilizing about 9 times lower power is as effective as continuous-wave laser for surface hardening. It produced an average surface hardness of ~719 HV (2.7 times higher than base material hardness) and ~200 µm hardened depth, which is comparable with continuous-wave laser hardening. Similarly, nanosecond laser could induce both surface hardening effect and material removal depending on the parameters used. However, a shallow hardened depth (of mere ~80 µm) was achieved compared to continuous-wave laser. Furthermore, femtosecond and picosecond lasers did not produce any observable surface hardening effect; instead they resulted in direct surface ablation.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Maharjan, Niroj
Zhou, Wei
Zhou, Yu
Guan, Yingchun
Wu, Naien
format Article
author Maharjan, Niroj
Zhou, Wei
Zhou, Yu
Guan, Yingchun
Wu, Naien
author_sort Maharjan, Niroj
title Comparative study of laser surface hardening of 50CrMo4 steel using continuous-wave laser and pulsed lasers with ms, ns, ps and fs pulse duration
title_short Comparative study of laser surface hardening of 50CrMo4 steel using continuous-wave laser and pulsed lasers with ms, ns, ps and fs pulse duration
title_full Comparative study of laser surface hardening of 50CrMo4 steel using continuous-wave laser and pulsed lasers with ms, ns, ps and fs pulse duration
title_fullStr Comparative study of laser surface hardening of 50CrMo4 steel using continuous-wave laser and pulsed lasers with ms, ns, ps and fs pulse duration
title_full_unstemmed Comparative study of laser surface hardening of 50CrMo4 steel using continuous-wave laser and pulsed lasers with ms, ns, ps and fs pulse duration
title_sort comparative study of laser surface hardening of 50crmo4 steel using continuous-wave laser and pulsed lasers with ms, ns, ps and fs pulse duration
publishDate 2019
url https://hdl.handle.net/10356/103419
http://hdl.handle.net/10220/48253
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