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Cavitation Erosion and Friction Behavior of Stainless Steel as a Function of Grain Size

Published online by Cambridge University Press:  01 February 2011

Giuseppe Bregliozzi ,
Syed Imad-Uddin Ahmed ,
Andrea Di Schino ,
Josè M. Kenny  and
Henry Haefke
Giuseppe Bregliozzi
Affiliation:
Micro and Nanomaterials Section, CSEM Swiss Center for Electronics and Microtechnology, Inc., Rue Jaquet-Droz 1, CH-2007 Neuchâtel, Switzerland.
Syed Imad-Uddin Ahmed
Affiliation:
Micro and Nanomaterials Section, CSEM Swiss Center for Electronics and Microtechnology, Inc., Rue Jaquet-Droz 1, CH-2007 Neuchâtel, Switzerland.
Andrea Di Schino
Affiliation:
Materials Engineering Center, University of Perugia, Loc. Pentima Bassa 21, I-05100 Terni, Italy.
Josè M. Kenny
Affiliation:
Materials Engineering Center, University of Perugia, Loc. Pentima Bassa 21, I-05100 Terni, Italy.
Henry Haefke
Affiliation:
Micro and Nanomaterials Section, CSEM Swiss Center for Electronics and Microtechnology, Inc., Rue Jaquet-Droz 1, CH-2007 Neuchâtel, Switzerland.
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Abstract

Research conducted on steels is motivated by a technological need to further improve their properties. Among the different steel types, austenitic stainless steels possess good corrosion resistance and formability. However, they also have a low yield strength. One way of increasing the yield strength is by grain refining. This work presents a study on the cavitation erosion and friction behavior of AISI 304 austenitic stainless steel characterized by two different grain sizes: 2.5 μm and 40 μm. The cavitation erosion behavior in water with different pH values and at room temperature has been studied by using a 20 kHz ultrasonic vibratory apparatus. The grain size of the steels has an important effect on the nature of damage produced on the surface of the samples. The resistance to cavitation erosion increases with decreasing grain size. It was also found that cavitation erosion resistance of the two steels is sensitive to variations in the pH value; decrease of this value produces an increase in surface damage. Using a precision microtribometer, with applied loads in the μN regime, it was found that capillarity plays a dominant role. At the same loads, in high humidity environments, both the fine and coarse grain steels exhibit high friction relative to measurements performed under dry conditions. At high loads (20 mN and above) a reversal in microfrictional behavior occurs in that friction is higher under dry conditions than under moist conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 782: Symposium A – Micro- and Nanosystems , 2003 , A5.38.
Copyright
Copyright © Materials Research Society 2004

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References

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