Comparative analysis of machinability and microstructure in LPBF and conventionally processed M300 maraging steel
Loading...
Date
2025-12-01
Authors
Kolomý, Štěpán
Slaný, Martin
Doubrava, Marek
Sedlák, Josef
Zouhar, Jan
Řehořek, Lukáš
0000-0003-3781-692XAdvisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Abstract
The heat treatment and machining can be considered as necessary post process operations to create functional components manufactured by means of laser powder bed fusion. Therefore, complex investigation of influence of microstructure on the machinability of maraging steel (MS) M300 parts produced by laser powder bed fusion (LPBF) and rolling was performed. The main evaluation was carried out in regard to hardness, milling forces, surface morphology, surface roughness, chip formation, and subsurface hardness and microstructure. The findings revealed that LPBF MS M300 after direct aging heat treatment, containing martensite with dispersed precipitates and reversed austenite, generated highest milling forces. Surface roughness of this material showed a lower surface roughness in comparison to as-built sample Due to the higher hardness, which caused a lower lateral plastic flow and most severe tool wear. The subsurface hardness under the milled area of direct aged samples increased by 24% (900 HV) in comparison to the bulk value, while in case of conventionally manufactured rolled sample the increase was only by 9%. More pronounced increase in subsurface hardness was measured on samples milled utilizing highest cutting speed (60 m.min-1). Furthermore, milling induced strain hardening affecting the subsurface area up to approximately 40 m in depth.
The heat treatment and machining can be considered as necessary post process operations to create functional components manufactured by means of laser powder bed fusion. Therefore, complex investigation of influence of microstructure on the machinability of maraging steel (MS) M300 parts produced by laser powder bed fusion (LPBF) and rolling was performed. The main evaluation was carried out in regard to hardness, milling forces, surface morphology, surface roughness, chip formation, and subsurface hardness and microstructure. The findings revealed that LPBF MS M300 after direct aging heat treatment, containing martensite with dispersed precipitates and reversed austenite, generated highest milling forces. Surface roughness of this material showed a lower surface roughness in comparison to as-built sample Due to the higher hardness, which caused a lower lateral plastic flow and most severe tool wear. The subsurface hardness under the milled area of direct aged samples increased by 24% (900 HV) in comparison to the bulk value, while in case of conventionally manufactured rolled sample the increase was only by 9%. More pronounced increase in subsurface hardness was measured on samples milled utilizing highest cutting speed (60 m.min-1). Furthermore, milling induced strain hardening affecting the subsurface area up to approximately 40 m in depth.
The heat treatment and machining can be considered as necessary post process operations to create functional components manufactured by means of laser powder bed fusion. Therefore, complex investigation of influence of microstructure on the machinability of maraging steel (MS) M300 parts produced by laser powder bed fusion (LPBF) and rolling was performed. The main evaluation was carried out in regard to hardness, milling forces, surface morphology, surface roughness, chip formation, and subsurface hardness and microstructure. The findings revealed that LPBF MS M300 after direct aging heat treatment, containing martensite with dispersed precipitates and reversed austenite, generated highest milling forces. Surface roughness of this material showed a lower surface roughness in comparison to as-built sample Due to the higher hardness, which caused a lower lateral plastic flow and most severe tool wear. The subsurface hardness under the milled area of direct aged samples increased by 24% (900 HV) in comparison to the bulk value, while in case of conventionally manufactured rolled sample the increase was only by 9%. More pronounced increase in subsurface hardness was measured on samples milled utilizing highest cutting speed (60 m.min-1). Furthermore, milling induced strain hardening affecting the subsurface area up to approximately 40 m in depth.
Description
Citation
Scientific Reports. 2025, vol. 15, issue October, p. 1-21.
https://www.nature.com/articles/s41598-025-19719-8
https://www.nature.com/articles/s41598-025-19719-8
Document type
Peer-reviewed
Document version
Published version
Date of access to the full text
Language of document
en
Study field
Comittee
Date of acceptance
Defence
Result of defence
Document licence
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/