Combined influence of cooling strategies and depth of cut on the deformation-induced martensitic transformation turning AISI 304

authored by: Lara Vivian Fricke, Stephan Basten, Hai Nam Nguyen, Bernd Breidenstein, Benjamin Kirsch, Jan C. Aurich, David Zaremba, Hans Jürgen Maier, Sebastian Barton
Abstract: The subsurface of metastable austenitic steels can be transformed to martensite by cryogenic turning. To enhance the phase transformation and at the same time the productivity of the production process to save time and energy, it is advantageous to use high depths of cut. However, when in-process cooling methods are used, the effectively cooled zone is cut away in the cryogenic machining process for high depths of cut. As it is shown in the present study by pre-cooling the workpieces using liquid N₂, the whole workpiece and following the subsurface layer is sufficiently cooled, and a high martensite content can be obtained at high depths of cut. Moreover, the use of a sub-zero metalworking fluid (MWF) also proved to be advantageous. The sub-zero MWF was applied within the cutting process. Due to the better heat transfer coefficient compared to other cryogenic in-process cooling methods like liquid N₂ or CO₂ snow, a high cooling capacity was achieved even though the lubricant had a higher working temperature. Additionally, the martensitic subsurface transformation was more homogeneous compared to other in-process cooling methods and the surface quality was enhanced. Further, eddy current testing is a suitable non-destructive testing method for possible process control as it allows for the detection of deformation-induced martensite. It showed, nevertheless, an additional in-process cooling to the pre-cooled workpieces is advantageous to ensure a homogeneous hardening effect over the workpiece length and cutting process time.
Organisation(s): Institute of Materials Science
Institute of Production Engineering and Machine Tools
External Organisation(s): University of Kaiserslautern
Type: Article
Journal: Journal of Materials Processing Technology
Volume: 312
ISSN: 0924-0136
Publication date: 03.2023
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Ceramics and Composites, Computer Science Applications, Metals and Alloys, Industrial and Manufacturing Engineering
Electronic version(s): https://doi.org/10.1016/j.jmatprotec.2023.117861 (Access: Closed)

BibTeX

@article{9d03d5e7eb034bf59c8d682541de5f30,
title = "Combined influence of cooling strategies and depth of cut on the deformation-induced martensitic transformation turning AISI 304",
abstract = "The subsurface of metastable austenitic steels can be transformed to martensite by cryogenic turning. To enhance the phase transformation and at the same time the productivity of the production process to save time and energy, it is advantageous to use high depths of cut. However, when in-process cooling methods are used, the effectively cooled zone is cut away in the cryogenic machining process for high depths of cut. As it is shown in the present study by pre-cooling the workpieces using liquid N2, the whole workpiece and following the subsurface layer is sufficiently cooled, and a high martensite content can be obtained at high depths of cut. Moreover, the use of a sub-zero metalworking fluid (MWF) also proved to be advantageous. The sub-zero MWF was applied within the cutting process. Due to the better heat transfer coefficient compared to other cryogenic in-process cooling methods like liquid N2 or CO2 snow, a high cooling capacity was achieved even though the lubricant had a higher working temperature. Additionally, the martensitic subsurface transformation was more homogeneous compared to other in-process cooling methods and the surface quality was enhanced. Further, eddy current testing is a suitable non-destructive testing method for possible process control as it allows for the detection of deformation-induced martensite. It showed, nevertheless, an additional in-process cooling to the pre-cooled workpieces is advantageous to ensure a homogeneous hardening effect over the workpiece length and cutting process time.",
keywords = "Cooling strategies, Cryogenic, Deformation-induced martensitic transformation, Eddy current testing, Machining",
author = "Fricke, {Lara Vivian} and Stephan Basten and Nguyen, {Hai Nam} and Bernd Breidenstein and Benjamin Kirsch and Aurich, {Jan C.} and David Zaremba and Maier, {Hans J{\"u}rgen} and Sebastian Barton",
note = "Funding Information: Financial support of this study by the German Research Foundation (DFG) within the research priority program SPP 2086 (grant project number 401800578 and 401538950 ) is gratefully acknowledged. ",
year = "2023",
month = mar,
doi = "10.1016/j.jmatprotec.2023.117861",
language = "English",
volume = "312",
journal = "Journal of Materials Processing Technology",
issn = "0924-0136",
publisher = "Elsevier BV",
}