Microstructure and Mechanical Properties of Thermomechanically Forged Tempering Steel 42CrMo4

authored by: Julian Diefenbach, Kai Brunotte, Bernd-Arno Behrens
Abstract: Thermomechanically treated (TMT) materials are characterized by a fine-grained microstructure, which leads to extraordinary mechanical properties. In this study, the alloyed tempering steel 42CrMo4 (AISI 4137) is used to set up a two-step TMT upsetting process with intermediate cooling. A water-air based cooling system was used to adjust different phase configurations between the two steps by varying the target temperature and cooling rate. Standardized test specimens for Charpy impact tests and tensile tests as well as for metallographic analyses are cut out of the formed parts. Tensile tests showed that the yield strength can be enhanced up to 1188 MPa while the elongation at break is about 12% without any additional heat treatment by forming the material after rapid cooling. This fulfills the demands of the standard in quenched and tempered state. This process route allows for local-load tailored part design and manufacturing by adjusting the forming conditions conveniently.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Conference contribution
Pages: 142-150
No. of pages: 9
Publication date: 25.09.2020
Publication status: Published
ASJC Scopus subject areas: Safety, Risk, Reliability and Quality, Economics, Econometrics and Finance (miscellaneous), Industrial and Manufacturing Engineering
Electronic version(s): https://doi.org/10.1007/978-3-662-62138-7_15 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{05123cb812744af9b3666a4cbc5f7db7,
title = "Microstructure and Mechanical Properties of Thermomechanically Forged Tempering Steel 42CrMo4",
abstract = "Thermomechanically treated (TMT) materials are characterized by a fine-grained microstructure, which leads to extraordinary mechanical properties. In this study, the alloyed tempering steel 42CrMo4 (AISI 4137) is used to set up a two-step TMT upsetting process with intermediate cooling. A water-air based cooling system was used to adjust different phase configurations between the two steps by varying the target temperature and cooling rate. Standardized test specimens for Charpy impact tests and tensile tests as well as for metallographic analyses are cut out of the formed parts. Tensile tests showed that the yield strength can be enhanced up to 1188 MPa while the elongation at break is about 12% without any additional heat treatment by forming the material after rapid cooling. This fulfills the demands of the standard in quenched and tempered state. This process route allows for local-load tailored part design and manufacturing by adjusting the forming conditions conveniently.",
keywords = "Forging, Mechanical properties, Thermomechanical treatment",
author = "Julian Diefenbach and Kai Brunotte and Bernd-Arno Behrens",
note = "Funding Information: Project “Improvement and identification of mechanical properties in forged parts by immediate post-forming after hot forging on different temperature levels by influencing microstructure of tempering steel” (359921546). The authors would like to thank the Deutsche Forschungsgemeinschaft (German Research Foundation, DFG) for the financial and organisational support of this project.; WGP Congress 2020 ; Conference date: 23-09-2020 Through 24-09-2020",
year = "2020",
month = sep,
day = "25",
doi = "10.1007/978-3-662-62138-7_15",
language = "English",
isbn = "9783662621370",
series = "Lecture Notes in Production Engineering",
publisher = "Springer Berlin Heidelberg",
pages = "142--150",
editor = "Bernd-Arno Behrens and Alexander Brosius and Wolfgang Hintze and Steffen Ihlenfeldt and Wulfsberg, {Jens Peter}",
booktitle = "Production at the leading edge of technology",
}