A study of the influence of the metallurgical state on shear band and white layer generation in 100Cr6 steel: application to machining
- LPMI/MSPTF- EA 1427, ENSAM. 02, Bd du Ronceray. BP 93525- 49035 Angers Cedex 01 (France)
The aim of this paper is to better understand the material behaviour involved in machining operations. During machining, the workpiece experiences large strains, high strain rate, high temperatures, complex loading histories, and recovery. To reproduce these loadings and to understand the behaviour of 100Cr6 bearing steel, quasi-static and dynamics mechanical shearing tests were carried out. These tests made it possible to reproduce the primary shear zone observed on the chips after cutting using specimens with special geometries ''hat-shaped specimens''. The geometry of these specimens results in a localised shearing zone when loaded in compression. Two metallurgical states of the material were investigated (with and without carbides). For each state, three material hardnesses are used (46, 51 and 55HRc). The tests parameters investigated were the strain rate and temperature. For all tests, the microstructures of the shear zones were examined. Results show that the presence of carbides has the tendency to increase the material resistance. The micrographic observations of the sheared zones highlighted the effect of the microstructure and the link between the thermo-mechanical effects and the characteristics of the white zones. It is possible to produce a white layer, similar to those obtained in machining, by quasi-static and dynamic shearing tests. The presence of carbides has a strong effect on the generation of the shear bands and the white layers. Increasing the test temperature and strain rate tends to increase the width of shear band and white layers. A comparison between the white layers obtained by the dynamic tests and those observed on the chip in hard turning are carried out. The results show good agreement.
- OSTI ID:
- 21057075
- Journal Information:
- AIP Conference Proceedings, Vol. 907, Issue 1; Conference: 10. ESAFORM conference on material forming, Zaragoza (Spain), 18-20 Apr 2007; Other Information: DOI: 10.1063/1.2729593; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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