Wear and Corrosion Behavior of Functionally Graded Semi-Solid 9Cr18Mo Steel

Abstract:

Article Preview

A kind of 9Cr18Mo multidiameter shaft part was fabricated through a designed thixoforging set-up. As compared with conventional heat treatment specimen, wear and corrosion behavior of 9Cr18Mo thixoforging specimen were studied. The results showed the surface of 9Cr18Mo thixoforging specimen demonstrated fine wear and corrosion resistance. Thixoforging specimen exhibited functionally graded property with inner austenite particles and fine dendrite eutectic skin layer. At the skin layer, the former solidified liquid led to the concentration of alloying elements such as Cr and Mo. Besides, eutectic structure of secondary austenite and M7C3 carbide helped to improve the hardness. The high hardness of M7C3 carbide and high concentration of Cr, Mo elements at the edge skin layer contributed to reducing the delamination wear, abrasive wear and the appearance of oxidation. Even at higher wear load, relative sliding occurred at the wear surface, which avoided crack formation and chunk spalling. As compared with conventional heat treatment specimen, corrosion current density of thixoforging surface reduced, while corrosion potential increased. Thixoforging surface also exhibited passivation behavior and the corrosion resistance increased slightly. High concentration of Cr and Mo at the skin layer avoided the formation of chromium depleted zone. In view that wear and corrosion failure tend to occur at the surface of specimen, the thixoforging specimen with a wear and corrosion skin layer might provide a possibility for expanding the application fields of 9Cr18Mo steel.

Info:

Periodical:

Solid State Phenomena (Volume 285)

Edited by:

Qiang Zhu, Ahmed Rassili, Stephen P. Midson and Xiao Gang Hu

Pages:

92-98

Citation:

Y. J. Wang et al., "Wear and Corrosion Behavior of Functionally Graded Semi-Solid 9Cr18Mo Steel", Solid State Phenomena, Vol. 285, pp. 92-98, 2019

Online since:

January 2019

Export:

Price:

$41.00

* - Corresponding Author

[1] D.H. Kirkwood, Semi-solid Processing of alloys, Springer, New York, (2009).

[2] M.C. Flemings, Behavior of metal alloys in the semisolid state, Metall.Trans.A 7, 22 (1991) 957-981.

[3] S.P. Midson, Industrial Applications for Aluminum Semi-Solid Castings, Semi-Solid Processing of Alloys and Composites XIII, 217-218 (2014) 487-495.

DOI: https://doi.org/10.4028/www.scientific.net/ssp.217-218.487

[4] A. Rassili, H.V. Atkinson, A review on steel thixoforming, Trans Nonferr Metal Soc. 20 (2010) s1048-s1054.

[5] G. Gu, R. Pesci, L. Langlois, E. Becker, R. Bigot, Microstructure investigation and flow behavior during thixoextrusion of M2 steel grade, J. Mater. Process. Technol. 216 (2015) 178-187.

DOI: https://doi.org/10.1016/j.jmatprotec.2014.09.009

[6] W. Püttgen, B. Hallstedt, W. Bleck, P.J. Uggowitzer, On the microstructure formation in chromium steels rapidly cooled from the semi-solid state, Acta Mater. 55 (2007) 1033-1042.

DOI: https://doi.org/10.1016/j.actamat.2006.09.021

[7] B. Bobic, J. Bajat, Z. Acimovic, I. Bobic, B. Jegdic, Corrosion behaviour of thixoformed and heat-treated ZA27 alloys in NaCl solution, Trans Nonferr Metal Soc. 23 (2013) 931-941.

DOI: https://doi.org/10.1016/s1003-6326(13)62550-9

[8] Y. Wang, R. Song, Y. Li, Flow mechanism of 9Cr18 steel during thixoforging and its properties for functionally graded material, Mater. Des. 86 (2015) 41-48.

DOI: https://doi.org/10.1016/j.matdes.2015.07.036

[9] A. Rogal, J. Dutkiewicz, Z. Szklarz, H. Krawiec, M. Kot, S. Zimowski, Mechanical properties and corrosion resistance of steel X210CrW12 after semi-solid processing and heat treatment, Mater. Charact. 88 (2014) 100-110.

DOI: https://doi.org/10.1016/j.matchar.2013.11.015

[10] N.V. Thuong, H. Zuhailawati, A.A. Seman, T.D. Huy, B.K. Dhindaw, Microstructural evolution and wear characteristics of equal channel angular pressing processed semi-solid-cast hypoeutectic aluminum alloys, Mater. Des. 67 (2015) 448-456.

DOI: https://doi.org/10.1016/j.matdes.2014.11.054

[11] S. Muenstermann, R. Telle, Wear and corrosion resistance of alumina dies for isothermal semi-solid processing of steel, Wear, 267 (2009) 1566-1573.

DOI: https://doi.org/10.1016/j.wear.2009.06.014