Abstract
The aim of this work is to investigate the durability of tool steels for hot stamping by comparing the wear resistance of three hot work tool steels. Friction and wear behaviours of different tool steels sliding against a 22MnB5 uncoated steel at elevated temperatures were investigated using a high-temperature version of the Optimol SRV reciprocating friction and wear tester at temperatures of 40 and 200°C. Our results show that friction decreased with increasing temperature, whereas wear of the tool steel increased with temperature for the second and the third tested tool steels. The slightly better wear behaviour of steel specimen 1 comes from the hardness of the carbides in the martensitic microstructure, which are rich in vanadium.
Highlights
Our results show that friction decreased with increasing temperature, whereas wear of the tool steel increased with temperature for the second and the third tested tool steels. e slightly better wear behaviour of steel specimen 1 comes from the hardness of the carbides in the martensitic microstructure, which are rich in vanadium
Over the past several years, the automotive industry has experienced a large growth in the manufacturing of ultrahigh-strength steel (UHSS) components, especially those who can be processed by means of hot stamping technology. is increase is related to improvements obtained with these steels in terms of crash resistance and fuel consumption reduction. e benefits of employing UHSS components are accompanied by important technological challenges though, since the particularities of the transformation of these steels have nothing to do with those of conventional steels
Since hot stamping tools are subjected to high temperatures, the wear of tool steels and the prevailing wear mechanisms have been studied in detail [2, 3]
Summary
Over the past several years, the automotive industry has experienced a large growth in the manufacturing of ultrahigh-strength steel (UHSS) components, especially those who can be processed by means of hot stamping technology. is increase is related to improvements obtained with these steels in terms of crash resistance and fuel consumption reduction. e benefits of employing UHSS components are accompanied by important technological challenges though, since the particularities of the transformation of these steels have nothing to do with those of conventional steels. One of the UHSS transformation related knowledge areas which is not yet well understood is the tribological interaction between the forming tools and the UHSS parts at high temperatures during the hot stamping process. In sheet metal forming, the wear of tool steels continues to be a great concern to the automotive industry because of increasing die maintenance costs and scrap rates. Cold forming tools are subjected to severe tribological stresses due to high contact pressures arising via sliding contact between the die and the sheet materials. Since hot stamping tools are subjected to high temperatures, the wear of tool steels and the prevailing wear mechanisms have been studied in detail [2, 3]. Understanding the factors that influence the wear mechanisms is necessary to minimize the rate of tool wear in hot stamping. E purpose of this article is to compare three specimen tool steels and assess which behave best against wear during
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