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Published in:
2021 | OriginalPaper | Chapter
Microstructure and Mechanical Properties of Thermomechanically Forged Tempering Steel 42CrMo4
Authors : J. Diefenbach, K. Brunotte, B.-A. Behrens
Published in: Production at the leading edge of technology
Publisher: Springer Berlin Heidelberg
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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.