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Optimal microstructures for martensitic steels

Published online by Cambridge University Press:  10 May 2012

P. Shanthraj  and
M.A. Zikry
P. Shanthraj
Affiliation:
Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695-7910
M.A. Zikry*
Affiliation:
Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695-7910
*
a)Address all correspondence to this author. e-mail: zikry@ncsu.edu
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Abstract

A dislocation–density-based model for slip transmission at variant boundaries and a microstructural failure criterion accounting for variant cleavage planes have been developed to determine optimal variant distributions for significantly improved ductility, through increased slip transmission, and fracture toughness, through increased resistance to crack propagation, in martensitic steels with refined blocks and packets. A crystal plasticity framework, accounting for variant morphologies and orientation relationships that are uniquely inherent to lath martensite, and specialized finite-element methodologies using overlapping elements to represent evolving fracture surfaces are used for a detailed analysis of fracture nucleation and intergranular and transgranular crack growth. The results indicate that the block sizes, variant orientations, and distributions are the key microstructural characteristics for toughening mechanisms, such as crack arrest and deflection, and for desired ductility, delayed crack nucleation, and greater fracture toughness. This approach can be the basis for validated design guidelines for the desired optimal behavior of high-strength and toughness steels.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 12 , 28 June 2012 , pp. 1598 - 1611
Copyright
Copyright © Materials Research Society 2012

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References

REFERENCES

1.Morito, S., Tanaka, H., Konishi, R., Furuhara, T., and Maki, T.: The morphology and crystallography of lath martensite in Fe-C alloys. Acta Mater. 51, 1789 (2003).CrossRefGoogle Scholar
2.Morito, S., Huang, X., Furuhara, T., Maki, T., and Hansen, N.: The morphology and crystallography of lath martensite in alloy steels. Acta Mater. 54, 5323 (2006).CrossRefGoogle Scholar
3.Takaki, S., Kawasaki, K., and Kimura, Y.: Mechanical properties of ultra fine grained steels. J. Mater. Process. Technol. 117, 359 (2001).CrossRefGoogle Scholar
4.Tsuji, N., Okuno, S., Koizumo, Y., and Minamino, Y.: Toughness of ultrafine grained ferritic steels fabricated by ARB and annealing process. Mater. Trans., JIM 45, 2272 (2004).CrossRefGoogle Scholar
5.Song, R., Ponge, D., and Raabe, D.: Mechanical properties of an ultrafine grained C-Mn steel processed by warm deformation and annealing. Acta Mater. 53, 4881 (2005).CrossRefGoogle Scholar
6.Ayada, M., Yuga, M., Tsuji, N., Saito, Y., and Yoneguti, A.: Effect of vanadium and niobium on restoration behavior after hot deformation in medium carbon spring steels. ISIJ Int. 38, 1022 (1998).CrossRefGoogle Scholar
7.Barani, A.A., Li, F., Romano, P., Ponge, D., and Raabe, D.: Design of high-strength steels by microalloying and thermomechanical treatment. Mater. Sci. Eng., A 463, 138 (2006).CrossRefGoogle Scholar
8.Kimura, Y., Inoue, T., Yin, F., and Tsuzaki, K.: Inverse temperature dependence of toughness in an ultrafine grain-structure steel. Science 320, 1057 (2008).CrossRefGoogle Scholar
9.Song, R., Ponge, D., Raabe, D., Speer, J.G., and Madock, D.K.: Overview of processing, microstructure and mechanical properties of ultrafine grained bcc steels. Mater. Sci. Eng., A 441, 1 (2006).CrossRefGoogle Scholar
10.Bhadeshia, H.K.D.K.: Properties of fine-grained steels generated by displacive transformation. Mater. Sci. Eng., A 481, 36 (2008).CrossRefGoogle Scholar
11.Calcagnotto, M., Adachi, Y., Ponge, D., and Raabe, D.: Deformation and fracture mechanisms in fine- and ultrafine-grained ferrite/martensite dual-phase steels and the effect of aging. Acta Mater. 59, 658 (2011).CrossRefGoogle Scholar
12.Howe, A.A.: Ultrafine grained steels: Industrial prospects. Mater. Sci. Technol. 16, 1264 (2000).CrossRefGoogle Scholar
13.Tsuji, N., Ito, Y., Saito, Y., and Minamino, Y.: Strength and ductility of ultrafine grained aluminum and iron produced by ARB and annealing. Scr. Mater. 47, 893 (2002).CrossRefGoogle Scholar
14.Tsuji, N., Kamikawa, N., Ueji, R., Takata, N., Koyama, H., and Terada, D.: Managing both strength and ductility in ultrafine grained steels. ISIJ Int. 48, 1114 (2008).CrossRefGoogle Scholar
15.Guo, Z., Lee, C.S., and Morris, J.W. Jr.: On coherent transformations in steel. Acta Mater. 52, 5511 (2004).CrossRefGoogle Scholar
16.Jin, S., Morris, J.W. Jr., and Zackay, V.F.: Grain refinement through thermal cycling in an Fe-Ni-Ti cryogenic alloy. Metall. Mater. Trans. A 6A, 141 (1975).CrossRefGoogle Scholar
17.Kim, H.J., Kim, Y.H., and Morris, J.W. Jr.: Thermal mechanisms of grain and packet refinement in a lath martensitic steel. ISIJ Int. 38, 1277 (1998).CrossRefGoogle Scholar
18.Inoue, T., Matsuda, S., Okamura, Y., and Aoki, K.: Fracture of a low carbon tempered martensite. Trans. Jpn. Inst. Metals 11, 36 (1970).CrossRefGoogle Scholar
19.Matsuda, S., Okamura, Y., Inoue, T., and Mimura, H.: Toughness and effective grain-size in heat-treated low-alloy high-strength steels. Trans. Iron Steel Inst. Jpn. 12, 325 (1972).CrossRefGoogle Scholar
20.Hughes, G.M., Smith, G.E., Crocker, A.G., and Flewitt, P.E.J.: An experimental and modelling study of brittle cleavage crack propagation in transformable ferritic steel. Mater. Sci. Technol. 27, 767 (2011).CrossRefGoogle Scholar
21.Shibata, A., Nagoshi, T., Sone, M., Morito, S., and Higo, Y.: Evaluation of the block boundary and sub-block boundary strengths of ferrous lath martensite using a micro-bending test. Mater. Sci. Eng., A 29, 7538 (2010).CrossRefGoogle Scholar
22.Ohmura, T. and Tsuzaki, K.: Plasticity initiation and subsequent deformation behavior in the vicinity of single grain boundary investigated through nanoindentation technique. J. Mater. Sci. 42, 1728 (2007).CrossRefGoogle Scholar
23.Kim, T., Hong, K.T., and Lee, K.S.: The relationship between the fracture toughness and grain boundary character distribution in polycrystalline NiAl. Intermetallics 11, 33 (2003).CrossRefGoogle Scholar
24.Zhang, Z.F., Wang, Z.G., and Eckert, J.: What types of grain boundaries can be passed through by persistent slip bands? J. Mater. Res. 18, 1031 (2003).CrossRefGoogle Scholar
25.Qiao, Y. and Argon, A.S.: Cleavage crack-growth resistance of grain boundaries in polycrystalline Fe-2%Si alloy: Experiment and modeling. Mech. Mater. 35, 129 (2003).CrossRefGoogle Scholar
26.Ohmura, T., Minor, A.M., Stach, E.A., and Morris, J.W. Jr.: Dislocation-grain boundary interactions in martensitic steel observed through in situ nanoindentation in a transmission electron microscope. J. Mater. Res. 19, 3626 (2004).CrossRefGoogle Scholar
27.Robertson, I.M., Lee, T.C., and Birnbaum, H.K.: Application of the in-situ TEM deformation technique to observe how clean and doped grain-boundaries respond to local stress-concentrations. Ultramicroscopy 40, 330 (1992).CrossRefGoogle Scholar
28.Hansbo, A. and Hansbo, P.: A finite element method for the simulation of strong and weak discontinuities in solid mechanics. Comput. Meth. Appl. Mech. Eng. 193, 3523 (2004).CrossRefGoogle Scholar
29.Asaro, R.J. and Rice, J.R.: Strain localization in ductile single-crystals. J. Mech. Phys. Solids 25, 309 (1977).CrossRefGoogle Scholar
30.Zikry, M.A.: An accurate and stable algorithm for high strain-rate finite strain plasticity. Comput. Struct. 50, 337 (1994).CrossRefGoogle Scholar
31.Franciosi, P., Berveiller, M., and Zaoui, A.: Latent hardening in copper and aluminum single-crystals. Acta Metall. 28, 273 (1980).CrossRefGoogle Scholar
32.Devincre, B., Hoc, T., and Kubin, L.: Dislocation mean free paths and strain hardening of crystals. Science 320, 1745 (2008).CrossRefGoogle ScholarPubMed
33.Kubin, L., Devincre, B., and Hoc, T.: Towards a physical model for strain hardening in fcc crystals. Mater. Sci. Eng., A 483–484, 19 (2008).CrossRefGoogle Scholar
34.Kubin, L., Devincre, B., and Hoc, T.: Modeling dislocation storage rates and mean free paths in face-centered cubic crystals. Acta Mater. 56, 6040 (2008).CrossRefGoogle Scholar
35.Zikry, M.A. and Kao, M.: Inelastic microstructural failure mechanisms in crystalline materials with high angle grain boundaries. J. Mech. Phys. Solids 44, 1765 (1996).CrossRefGoogle Scholar
36.Shanthraj, P. and Zikry, M.A.: Dislocation density evolution and interactions in crystalline materials. Acta Mater. 59, 7695 (2011).CrossRefGoogle Scholar
37.Shanthraj, P., Hatem, T., and Zikry, M.A.: Microstructural modeling of failure modes in martensitic steel alloys. in New methods in steel design—steel ab initio, edited by Dronskowski, R., Turchi, P.E.A., Adachi, Y., and Raabe, D. (Mater. Res. Soc. Symp. Proc. 1296, Pittsburgh, PA, 2011), mrsf10-1296-o05-10.Google Scholar
38.Ma, A., Roters, F., and Raabe, D.: Studying the effect of grain boundaries in dislocation density based crystal-plasticity finite element simulations. Int. J. Solids Struct. 43, 7287 (2006).CrossRefGoogle Scholar
39.de Koning, M., Miller, R., Bulatov, V.V., and Abraham, F.: Modelling grain-boundary resistance in intergranular slip transmission. Philos. Mag. A 82, 2511 (2002).CrossRefGoogle Scholar
40.Lee, T.C., Robertson, I.M., and Birnbaum, H.K.: An in situ transmission electron-microscope deformation study of the slip transfer mechanisms in metals. Metall. Trans. A 21, 2437 (1990).CrossRefGoogle Scholar
41.Hatem, T. and Zikry, M.A.: Shear pipe effects and dynamic shear-strain localization in martensitic steels. Acta Mater. 57, 4558 (2009).CrossRefGoogle Scholar
42.Song, J.H., Areias, P.M.A., and Belytschko, T.: A method for dynamic crack and shear band propagation with phantom nodes. Int. J. Numer. Methods Eng. 67, 868 (2006).CrossRefGoogle Scholar
43.Hatem, T.M. and Zikry, M.A.: A model for determining initial dislocation-densities associated with martensitic transformations. Mater. Sci. Technol. 27, 1570 (2011).CrossRefGoogle Scholar
44.Krauss, G.: Martensite in steel: Strength and structure. Mater. Sci. Eng., A A273–A275, 40 (1999).CrossRefGoogle Scholar
45.Dodd, B. and Bai, Y.: Width of adiabatic shear bands. Mater. Sci. Technol. 1, 38 (1985).CrossRefGoogle Scholar
46.Madec, R., and Kubin, L.P.: Second order junctions and strain hardening in bcc and fcc crystals. Scr. Mater. 58, 767 (2008).CrossRefGoogle Scholar
47.Queyreau, S., Monnet, G., and Devincre, B.: Slip systems interactions in alpha-iron determined by dislocation dynamics simulations. Int. J. Plast. 25, 361 (2009).CrossRefGoogle Scholar