Study of the Relationship between Entropy and Hardness in Laser Cutting of Hardox Steel

Autor:	Constantin Cristinel Girdu, Catalin Gheorghe
Jazyk:	angličtina
Rok vydání:	2023
Předmět:	entropy hardness laser cutting heat affected zone power density Technology Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Zdroj:	Materials, Vol 16, Iss 13, p 4540 (2023)
Druh dokumentu:	article
ISSN:	16134540 1996-1944
DOI:	10.3390/ma16134540
Popis:	The article presents the findings of a study on the machining of 10 mm thick Hardox 400 steel plates using the CO2 laser. The purpose of the investigation was to investigate the relationship between the entropy and the hardness of machined surfaces. For this purpose, a new mathematical model is established to estimate the entropy, and its influence on the hardness is determined. The mathematical model is statistically and experimentally validated. An entropy variation ΔS = −330 mJ/K between 2 K is found, causing a decrease in hardness compared to the standard value. The influences of input parameters (laser power, cutting speed, and auxiliary gas pressure) on hardness are determined. It is demonstrated that the surface hardness is strongly influenced by the auxiliary gas pressure. The combination of laser power P = 4200 W with gas pressure p = 0.45 bar at average cutting speed v = 1400 mm/min leads to a hardness of 38 HRC, extending the life and wear resistance of the cut parts.
Databáze:	Directory of Open Access Journals
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