TY - JOUR

T1 - Effects of alloying elements in UHC-steels and consequences for the machinability

AU - Denkena, B.

AU - Grove, T.

AU - Dittrich, M. A.

AU - Beiler, C.

AU - Lahres, M.

N1 - Funding information: The authors would like to thank the Institute of Materials Science of the Leibniz Universität Hannover for conducting the presented WDX-analyses. This work was supported by the Karlsruhe Nano Micro Facility (KNMF, http://www.knmf.kit.edu ), a Helmholtz research infrastructure at Karlsruhe Institute of Technology (KIT, http://www.kit.edu ). Finally, the authors would like to thank Tobias Weingärtner, who carried out the Auger electron spectroscopy measurements. This research and development project is funded by the German Federal Ministry of Education and Research (BMBF) within the Framework Concept “Research for Tomorrow's Production” (funding number: 02PN2050 ff ) and managed by the Project Management Agency Karlsruhe (PTKA).

PY - 2015/4/24

Y1 - 2015/4/24

N2 - Due to their high strength and reduced density aluminum-alloyed ultra-high-carbon steels (UHC-steels) show high potential for industrial applications. In an earlier study, segmented chip formation has been observed in turning alloyed UHC-steel. The formation of serrated chips imposes a limit on the productivity when machining this material. In order to enhance the machinability the chip formation mechanisms are investigated and recommendations for the tool design derived. Additionally, approaches for an optimized material processing (heat treatment) that improves the machinability are discussed. The recommendations are based on a detailed microstructure analysis by scanning electron microscopy (SEM), electron backscattering diffraction (EBSD), wavelength dispersive X-ray diffraction (WDX) and Auger electron spectroscopy (AES). Subsequent chip root experiments and micro indentation tests give further insight into the chip formation mechanisms. The observed chip formation mechanisms are connected to the obtained results on the microstructure of the aluminum-alloyed UHC-steel. It is shown that additional alloying components like chromium and manganese alter the microstructure and contribute to a serrated chip formation.

AB - Due to their high strength and reduced density aluminum-alloyed ultra-high-carbon steels (UHC-steels) show high potential for industrial applications. In an earlier study, segmented chip formation has been observed in turning alloyed UHC-steel. The formation of serrated chips imposes a limit on the productivity when machining this material. In order to enhance the machinability the chip formation mechanisms are investigated and recommendations for the tool design derived. Additionally, approaches for an optimized material processing (heat treatment) that improves the machinability are discussed. The recommendations are based on a detailed microstructure analysis by scanning electron microscopy (SEM), electron backscattering diffraction (EBSD), wavelength dispersive X-ray diffraction (WDX) and Auger electron spectroscopy (AES). Subsequent chip root experiments and micro indentation tests give further insight into the chip formation mechanisms. The observed chip formation mechanisms are connected to the obtained results on the microstructure of the aluminum-alloyed UHC-steel. It is shown that additional alloying components like chromium and manganese alter the microstructure and contribute to a serrated chip formation.

KW - Chip formation mechanism

KW - Material

KW - Microstructure

UR - http://www.scopus.com/inward/record.url?scp=84946497147&partnerID=8YFLogxK

U2 - 10.1016/j.cirpj.2015.04.001

DO - 10.1016/j.cirpj.2015.04.001

M3 - Article

AN - SCOPUS:84946497147

VL - 10

SP - 102

EP - 109

JO - CIRP Journal of Manufacturing Science and Technology

JF - CIRP Journal of Manufacturing Science and Technology

SN - 1755-5817

ER -