Effects of annealing treatment on microstructure and hardness in the 28 wt% Cr cast iron with Mo/W addition
DOI:
https://doi.org/10.55713/jmmm.v31i2.1059Keywords:
High chromium cast iron, Microstructure, Annealing, Hardness, CarbideAbstract
In this study, the effects of annealing on the hardness and microstructure of 28 wt% Cr-2.6 wt% C iron with 1.4 wt% Mo/1 wt% W addition have been investigated. The as-cast samples were heated to 800℃ and held for 4 h followed by slow cooled with a cooling rate of 20℃h-1 to 500℃. Microstructures were characterized by X-ray diffractometry, optical microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Vickers macro-hardness and micro-hardness were measured. It was found that the as-cast microstructure in the hypoeutectic 28 wt% Cr iron without Mo or W addition consisted of primary austenite dendrite, eutectic M7C3 carbide and martensite. In the iron with 1.4 wt% Mo addition, multiple eutectic carbides of M7C3, M23C6 and M6C were observed. In contrast the addition of 1 wt% W changed the structure to hypereutectic containing primary M7C3, eutectic M7C3 and martensite. After the annealing heat treatment, ferrite +secondary carbides and some pearlite were present in the irons, due to decomposition of austenite during annealing. The macro-hardness in the as-cast condition of the iron without alloying and the irons with 1.4 wt% Mo/ 1 wt% W addition were 506, 529, and 576 HV30, respectively. Annealing heat treatment reduced the macro-hardness to about 390, 463, and 428 HV30, respectively.
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References
C. P. Tabrett, I. R. Sare, and M. R.Ghomashchi, “Microstructure-property relationships in high chromium white iron alloys,” International Materials Reviews, vol. 41, pp. 59-82, 1996.
G. Laird, R. Gundlach, and K. Rohrig, Abrasion-resistant cast iron Handbook. USA: AFS, 2000.
A. Wiengmoon, T. Chairuangsri, A. Brown, R. Brydson, D. V. Edmonds, and J. T. H. Pearce, “Microstructural and crystallo-graphical study of carbides in 30 wt%Cr cast irons,” Acta Materialia, vol. 53, pp. 4143-4154, 2005.
M. Filipovic, Z. Kamberovic, and M. Korac, “Solidification of High Chromium white cast iron alloyed with vanadium,” Materials Transactions, vol. 52, pp. 386-390, 2011.
P. Dupin, and J. M. Schissler, “Influence of addition of silicon, molybdenum, vanadium, and tungsten upon the structural evolution of the as-cast state of a high-chromium cast iron (20% Cr, 2.6% C).” AFS Transactions, vol. 92, pp. 355-360, 1984.
J. W. Choi, and S. K. Chang, “Effects of molybdenum and copper additions on microstructure of high chromium cast iron rolls.” ISIJ International, vol. 32, pp. 1170-1176, 1992.
K. Yamamoto, S. Inthidech, N. Sasaguri, and Y. Matsubara, “Influence of Mo and W on high temperature hardness of M7C3 carbide in high chromium white cast iron,” Materials Transactions,” vol. 55, pp. 684-689, 2014.
S. Imurai, C. Thanachayanont, J. T. H. Pearce, K. Tsuda, and T. Chairuangsri, “Effects of Mo on microstructure of as-cast 28 wt% Cr-2.6 wt% C-(0-10) wt% Mo irons.” Materials Characterization, vol. 90, pp. 99-112, 2014.
S. H. Mousavi Anijdan , A. Bahrami, N. Varahram, and P. Davamic, “Effects of tungsten on erosion–corrosion behavior of high chromium white cast iron.” Materials Science and Engineering, vol. 454-455, pp. 623-628, 2007.
S. Imurai, C. Thanachayanont, J. T. H. Pearce, K. Tsuda, and T. Chairuangsri, “Effects of W on microstructure of as-cast 28 wt% Cr-2.6 wt% C-(0-10) wt%W irons.” Materials Characterization, vol. 99, pp. 52-60, 2015.
K. A. Kibble, and J. T. H. Pearce, “An examination of the effects of heat treatment secondary carbide formation in 25% Cr high chromium irons,” Cast Metals, vol. 8, pp. 123-127, 1995.
K. A. Kibble, and J. T. H. Pearce, “Influence of heat treatment on the microstructure and hardness of 19% high-chromium cast irons,” Cast Metals, vol. 6, pp. 9-15, 1993.
L. Chen, J. Zhou, V. Bushlya, and J. E. Stahl, “Influences of micro mechanical property and microstructure on performance of machining high chromium white cast iron with CBN tools” Procedia CIRP, vol. 31, pp. 172-178, 2015.
P. O. Cubillos, P. A. N. Bernardini, M. C. Fredel, and R. A. Campos, “Wear resistance of high chromium white cast iron for coal grinding rolls,”Revista Facultad de Ingenieria, University of Antioquia, vol. 76, pp. 134-142, 2015.
A. E. Karantzalis, A. Lekatou, and H. Mavros, “Microstructural modifications of as-cast high-chromium white iron by heat treatment,” Journal of Materials Engineering and Performance, vol. 18, pp. 174-181, 2009.
J. O. Agunsoye, and A. A. Ayeni, “Effect of heat treatment on the abrasive wear behavior of high chromium iron under dry sliding condition.” Tribology in Industry, vol. 34(2), pp. 82-91, 2012.
M. N. Berkun, I. P. Volchok, I. V. Zhivitsa, and V. I. Topal, “Effect of heat treatment on the properties of high-chromium cast iron.” Metal Science and Heat Treatment, vol. 13, pp. 69-71, 1971.
A. Wiengmoon, J. Khantee, J. T. H. Pearce, and T. Chairuangsri, Effect of pre-annealing heat treatment on destabilization behavior of 28 wt% Cr-2.6 wt% C high-chromium cast iron, IOP Conference Series: Materials Science and Engineering, vol. 474, pp. 1-6, 2019.
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