Microstructure and Mechanical Properties of an Ultrafine Grained Medium-Mn Steel

Abstract:

The effect of cold working followed by annealing on the development of ultrafine grained microstructure and mechanical properties of an Fe-12%Mn-0.6%C-1.5%Al medium-manganese steel was studied. The steel was cold rolled with intermediate annealings and then annealed at 873 K or 923 K for 30 min. The yield strength and total elongation of the Fe-12Mn-0.6C-1.5Al steel after cold rolling were 1200 MPa and 14%, respectively. The heat treatments resulted in the formation of two phase (austenite-ferrite) ultrafine grained microstructures with average grain sizes of 0.9 to 1.2 μm, depending on the annealing temperature. The annealed ultrafine grained steel samples exhibit the yield strength in the range of 800-950 MPa, the ultimate tensile strength in the range of 1150-1200 MPa, and total elongation of 12% to 19%.

• Periodical: Defect and Diffusion Forum (Volume 385)
• Pages: 308-313
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.385.308
• Online since: July 2018
• Authors: Vladimir Torganchuk, Dmitri A. Molodov*, Andrey Belyakov, Rustam Kaibyshev
• Keywords: Annealing, Mechanical Properties, Microstructure, Rolling, TWIP/TRIP

References

[1] B.C. De Cooman, J. Kim, K. Chin, High Mn TWIP steels for automotive applications, INTECH Open Access Publisher, (2011).

DOI: 10.5772/14086

[2] S. Keeler, M. Kimchi, Advanced High-Strength Steels Application Guidelines V5, WorldAutoSteel, (2015).

[3] P. Lan, J. Zhang, Tensile property and microstructure of Fe-22Mn-0.5C TWIP steel, Mater. Sci. Eng. A. 707 (2017) 373–382.

DOI: 10.1016/j.msea.2017.09.061

[4] C. Scott, B. Remy, J.-L. Collet, A. Cael, C. Bao, F. Danoix, B. Malard, C. Curfs, Precipitation strengthening in high manganese austenitic TWIP steels, Int. J. Mater. Res. 102 (2011) 538–549.

DOI: 10.3139/146.110508

[5] Y.Z. Tian, Y. Bai, L.J. Zhao, S. Gao, H.K. Yang, A. Shibata, Z.F. Zhang, N. Tsuji, A novel ultrafine-grained Fe22Mn0.6C TWIP steel with superior strength and ductility, Mater. Charact. (2017).

DOI: 10.1016/j.matchar.2016.12.026

[6] Z. Yanushkevich, A. Belyakov, R. Kaibyshev, D. Molodov, Effect of large plastic deformation on microstructure and mechanical properties of a TWIP steel, IOP Conf. Ser. Mater. Sci. Eng. 63 (2014) 012064.

DOI: 10.1088/1757-899x/63/1/012064

[7] V. Torganchuk, A. Belyakov, R. Kaibyshev, Effect of rolling temperature on microstructure and mechanical properties of 18%Mn TWIP/TRIP steels, Mater. Sci. Eng. A. 708 (2017) 110–117.

DOI: 10.1016/j.msea.2017.09.122

[8] A. Belyakov, R. Kaibyshev, V. Torganchuk, Microstructure and Mechanical Properties of 18%Mn TWIP/TRIP Steels Processed by Warm or Hot Rolling, Steel Res. Int. 88 (2017) 171–175.

DOI: 10.1002/srin.201600123

[9] G.W. Yuan, M.X. Huang, Supper strong nanostructured TWIP steels for automotive applications, Prog. Nat. Sci. Mater. Int. 24 (2014) 50–55.

DOI: 10.1016/j.pnsc.2014.01.004

[10] A. Kalinenko, P. Kusakin, A. Belyakov, R. Kaibyshev, D. Molodov, Microstructure and Mechanical Properties of a High-Mn TWIP Steel Subjected to Cold Rolling and Annealing, Metals. 7 (2017) 571.

DOI: 10.3390/met7120571

[11] Z. Yanushkevich, A. Belyakov, R. Kaibyshev, C. Haase, D.A. Molodov, Effect of cold rolling on recrystallization and tensile behavior of a high-Mn steel, Mater. Charact. 112 (2016) 180–187.

DOI: 10.1016/j.matchar.2015.12.021

[12] Z. Yanushkevich, A. Belyakov, C. Haase, D.A. Molodov, R. Kaibyshev, Structural/textural changes and strengthening of an advanced high-Mn steel subjected to cold rolling, Mater. Sci. Eng. A. 651 (2016) 763–773.

DOI: 10.1016/j.msea.2015.11.027

[13] P. Kusakin, A. Belyakov, C. Haase, R. Kaibyshev, D.A. Molodov, Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling, Mater. Sci. Eng. A. 617 (2014) 52–60.

DOI: 10.1016/j.msea.2014.08.051