Investigation of laser surface remelting supported by acoustic emission analysis and machine learning

Ravnikar, Dunja (author), Mojškerc, Bor (author), Šturm, Roman (author)

In the present work, laser surface remelting (LSR) was carried out on C45 carbon steel using an Nd:YAG pulse laser. The effect of process parameters, such as different laser pulse durations and the absence or presence of a graphite absorber, on the microstructure, remelting depth, and microhardness was examined. In most cases, the graphite coating enhanced the laser energy absorption into the surface, resulting in greater depths of the remelted zone (RZ). RZ depth increased ranging from 8 to 350 pct, depending on the laser pulse duration. An increase in the surface microhardness by a factor of 2.6 was achieved in comparison with the substrate material microhardness, namely 559 HV 0.05 versus 211 HV 0.05. Concurrently, the LSR treatment parameters were also investigated using the in process generated acoustic emission (AE) signals. AE characteristics, such as AE peak amplitude, signal duration, count, and energy, were evaluated. A correlation of the AE characteristics was established for the various LSR treatment parameters. The LSR treatment classification results confirm the feasibility of using AE in combination with machine learning (ML) for monitoring LSR and the resulting surface properties of the hardened material.

• Language: English
• Keywords: laser surface remelting, microstructure, acoustic emission, machine learning
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2022
• Number of pages: 13 str.
• Numbering: Vol. 53
• PID: 20.500.12556/RUL-134938
• UDC: 620.1/.2:621.785:534
• ISSN on article: 1073-5623
• DOI: 10.1007/s11661-021-06552-7
• COBISS.SI-ID: 96993283
• Publication date in RUL: 11.02.2022

Record is a part of a journal

• Title: Metallurgical and materials transactions
• Shortened title: Metall. mater. trans., A Phys. metall. mater. sci.
• Publisher: Minerals, Metals & Materials Society, ASM International
• ISSN: 1073-5623
• COBISS.SI-ID: 2752790

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 04.02.2022

Secondary language

• Language: Slovenian
• Keywords: lasersko površinsko pretaljevanje, mikrostruktura, akustična emisija, strojno učenje

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0270
• Name: Proizvodni sistemi, laserske tehnologije in spajanje materialov