Microstructural Evolution and Wear Behavior Involving the K-Carbides Precipitation of a Fe-25Mn-6.6Al-1.3C Austenitic Steel

Abstract:

In this paper, the microstructural evolution and mechanical properties of the as-cast Fe-25Mn-7Al-1.3C austenitic steel after different heat treatment were investigated. After solution treatment and subsequent aging treatment, the κ-carbides with perovskite structure were found to precipitate coherently within the austenite matrix, which improved the initial hardness and mechanical strength. The experimental steel exhibited an optimal comprehensive performance after being solution treated at 1050 °C for 1 h and then aged at 550 oC for 2 h. The tensile strength was 751 MPa, the yield strength was 581 MPa, the elongation was 48%, the hardness was 252 HB, and the Charpy V-notch impact toughness was 168 J, respectively. The impact wear test was carried out on MLD-10 abrasive wear testing machine, and the worn out surfaces under different heat treatment were characterized by scanning electron microscopy (SEM). The results indicated that the abrasion resistance of the steel under the additional aging treatment was better than that of the as-solutionized steel. The optimal abrasion resistance was obtained after being soluted at 1050 °C for 1 h and then aged at 550 oC for 2 h. However, with the aging time increasing, the coarse κ-carbides precipitating around the grain boundaries would deteriorate toughness, which lead to increase of the abrasive wear volume loss. Besides, obvious micro-cracking and relatively larger peeling pit were observed.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 668-673
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.668
• Online since: December 2018
• Authors: Yi Fan Feng, Ren Bo Song*, Zhong Zheng Pei, Lun Li
• Keywords: Austenitic Steel, Impact Wear, K-Carbides Precipitation, Mechanical Properties, Microstructural Evolution

References

[1] E.G. Moghaddam, N. Varahram, P. Davami, On the comparison of microstructural characteristics and mechanical properties of high-vanadium austenitic manganese steels with the Hadfield steel, Mater. Sci. Eng. A, 532(2012), 260-266.

DOI: 10.1016/j.msea.2011.10.089

[2] M. Abbasi, S. Kheirandish, Y. Kharrazi, J. Hejazi, The fracture and plastic deformation of aluminum alloyed Hadfield steels, Mater. Sci. Eng. A, 513 (2009), 72-76.

DOI: 10.1016/j.msea.2009.02.023

[3] A. Akhtar, E. Teghtsoonian, Solid solution strengthening of magnesium single crystals-ii the effect of solute on the ease of prismatic slip, Acta Met., 17 (1969), 1339-1349.

DOI: 10.1016/0001-6160(69)90152-7

[4] I. El-Mahallawi, R. Abdel-Karim, A. Naguib, Evaluation of effect of chromium on wear performance of high manganese steel, Mater. Sci. Tech., 17 (2001), 1385-1390.

DOI: 10.1179/026708301101509340

[5] R. Xiong, H. Peng, S. Wang, H. Si, Y. Wen, Effect of stacking fault energy on work hardening behaviors in Fe-Mn-Si-C high manganese steels by varying silicon and carbon contents, Mater. Des., 85 (2015), 707-714.

DOI: 10.1016/j.matdes.2015.07.072

[6] Chen C, Zhang F C, Wang F, et al. Effect of N+ Cr alloying on the microstructures and tensile properties of Hadfield steel. Materials Science and Engineering: A, 2017, 679: 95-103.

DOI: 10.1016/j.msea.2016.09.106

[7] Y.H. Wen, H.B. Peng, H.T. Si, R.L. Xiong, D. Raabe, A novel high manganese austenitic steel with higher work hardening capacity and much lower impact deformation than Hadfield manganese steel, Mater. Des., 55 (2014), 798-804.

DOI: 10.1016/j.matdes.2013.09.057

[8] WK. Choo, JH. Kim, JC. Yoon, Microstructural change in austenitic Fe-30.0wt%Mn-7.8wt%Al1.3wt%C initiated by spinodal decomposition and its influence on mechanical properties, Acta. Mater, 1997, 45(12), 4877-4885.

DOI: 10.1016/s1359-6454(97)00201-2

[9] Sato K, Tagawa K, Inoue Y. Spinodal decomposition and mechanical roperties of an austenitic Fe-30wt.%Mn-9wt.%Al-0.9wt.%C alloy. Mater Sci Eng A 1989; 111: 45-50.

DOI: 10.1016/0921-5093(89)90196-2

[10] Bartlett L, Van Aken D, Medvedeva J, Isheim D, Medvedeva NI, Song K. An atom probe study of kappa carbide precipitation and the effect of silicon addition. Metall Mater Trans A 2014;45(5): 2421-2435.

DOI: 10.1007/s11661-014-2187-3