5-8 September 2022
Wyndham Grand Salzburg Conference Center
Europe/Vienna timezone

Corrosion resistance of cryogenically treated tool steels.

7 Sep 2022, 11:10
25m
Room 3

Room 3

Oral Presentation Thermal processing of Iron and Steels (annealing, hardening, tempering, Q&T, Q&P) STEEL

Speaker

Peter JURIČ (Slovak University of Technology)

Description

Corrosion resistance may be of some importance if the tools are operated in harsh environments that contain acids, seawater or other chemical substances. Therefore it is appropriate to control this property carefully, by using proper heat treatment route. One of possible ways how to change the corrosion resistance of tool steels is the application of cryogenic treatment. This treatment reduces the retained austenite amount, produces extra carbides in steels microstructures, changes the precipitation of nano-sized carbides, and makes an overall microstructural refinement. These microstructural alteration change the corrosion potentials of exposed surfaces, and thereby the materials resistance against corrosion. In this paper the impact of cryogenic treatments on corrosion resistance is demonstrated upon an example of Vanadis 6 steel. This steel was subjected to different combinations of cryogenic treatments (-75, 140, -196 or -269°C) and tempering (no, 170, 330, 450 or 530°C). Then, the steel specimens were tested by potentiodynamic polarization method, in 3.5% NaCl solution. A general improvement of corrosion resistance of the material was recorded due to cryogenic treatment, with the maximum improvement after cryogenic treatment at -140°C. It was suggested that enhanced number and more uniform distribution of carbides can more than sufficiently compensate lowered retained austenite amounts, thus induce improved corrosion resistance.

Speaker Country Slovakia

Primary authors

Peter JURIČ (Slovak University of Technology) Dr Aneta BARTKOWSKA (Poznan University of Technology) Dr Dariusz BARTKOWSKI (Poznan University of Technology) Dr Jana PTAČINOVÁ (Institute of Materials Science, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology) Dr Juraj ĎURICA (Institute of Materials Science, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology)

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