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Mechanism of hot ductility loss in C–Mn steels based on nonequilibrium grain boundary segregation of impurities

Published online by Cambridge University Press:  24 April 2015

Zongwen Zheng ,
Hongyao Yu ,
Zhenjun Liu ,
Tingdong Xu  and
R. Devesh K. Misra
Zongwen Zheng*
Affiliation:
Superalloy Department, Central Iron & Steel Research Institute, Beijing 100081, People's Republic of China
Hongyao Yu
Affiliation:
Superalloy Department, Central Iron & Steel Research Institute, Beijing 100081, People's Republic of China
Zhenjun Liu
Affiliation:
Superalloy Department, Central Iron & Steel Research Institute, Beijing 100081, People's Republic of China
Tingdong Xu
Affiliation:
Superalloy Department, Central Iron & Steel Research Institute, Beijing 100081, People's Republic of China
R. Devesh K. Misra
Affiliation:
Department of Metallurgical and Materials Engineering, Center for Structural and Functional Materials Research and Innovation, University of Texas at El Paso, El Paso, Texas 79968, USA
*
a)Address all correspondence to this author. e-mail: zwzheng2013@163.com
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Abstract

The subject of hot ductility in C–Mn steels has been the focus of interest for a long time in materials science and engineering. However, the mechanism of loss in hot ductility continues to be unclear. In the present paper, the experimental hot ductility data in C–Mn steels involve: (i) a ductility trough appears at a certain temperature when the sample is held for a certain time at various temperatures after cooling quickly from a higher temperature; (ii) the ductility healing phenomenon which occurs with the duration of holding time; (iii) the ductility deteriorates with the increase of temperature difference between solution treatment temperature and test temperature during a tensile test; (iv) a minimum ductility appears when samples are cooled from a higher temperature to a lower one at a certain cooling rate; and (v) the formation of cavities at grain boundaries during tests. All of these are analyzed and calculated from the perspective of thermally induced nonequilibrium grain-boundary segregation (TNGS). Based on our detailed analyses, the loss in hot ductility of C–Mn steels is ascribed to TNGS of impurities.

Keywords

hot ductility lossC–Mn steelimpuritiesgrain-boundary segregation
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 10 , 28 May 2015 , pp. 1701 - 1714
Copyright
Copyright © Materials Research Society 2015 

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References

REFERENCES

Lankford, W.T.: Some considerations of strength and ductility in the continuous-casting. Metall. Trans. 3(6), 1331 (1972).Google Scholar
Suzuki, H.G., Nishimura, S., and Yamagnchi, S.: Characteristics of hot ductility in steels subjected to the melting and solidification. Trans. Iron Steel Inst. Jpn. 22, 48 (1982).Google Scholar
Mintz, B., Yue, S., and Jonas, J.J.: Hot ductility of steels and its relationship to the problem of transverse cracking during continuous casting. Int. Mater. Rev. 36, 187 (1991).Google Scholar
Mintz, B.: The influence of composition on the hot ductility of steels and to the problem of transverse cracking. ISIJ Int. 39, 833 (1999).Google Scholar
Nagasaki, C., Aizawa, A., and Kihara, J.: Influence of manganese and sulfur on hot ductility of carbon steels at high strain rate. Trans. Iron Steel Inst. Jpn. 27, 506 (1987).Google Scholar
Liu, C.M., Abiko, K., and Tanino, M.: Relation between the intergranular segregation of S and the hot ductility in high purity Fe-S alloys. Acta Metall. Sin. (Engl. Lett.) 12, 637 (1999).Google Scholar
Sun, D., Yamane, T., and Hirao, K.: Intermediate-temperature brittleness of a ferritic 17Cr stainless steel. J. Mater. Sci. 26, 5767 (1991).Google Scholar
Matsuoka, H., Osawa, K., Ono, M., and Ohmura, M.: Influence of Cu and Sn on hot ductility of steels with various C content. ISIJ Int. 37, 255 (1997).CrossRefGoogle Scholar
Xu, T.D. and Song, S.H.: A kinetic model of non-equilibrium grain-boundary segregation. Acta Metall. 37(9), 2499 (1989).CrossRefGoogle Scholar
Xu, T.D. and Cheng, B.Y.: Kinetics of non-equilibrium grain-boundary segregation. Prog. Mater. Sci. 49, 109 (2004).Google Scholar
Xu, T.D., Zheng, L., Wang, K., and Misra, R.D.K.: Unified mechanism of intergranular embrittlement based on non-equilibrium grain boundary segregation. Int. Mater. Rev. 58(5), 263 (2013).CrossRefGoogle Scholar
Williams, T.M., Stoneham, A.M., and Harries, D.R.: The segregation of boron to grain boundaries in solution-treated Type 316 austenitic stainless steel. Met. Sci. 10(1), 14 (1976).Google Scholar
Faulkner, R.G.: Non-equilibrium grain-boundary segregation in austenitic alloys. J. Mater. Sci. 16, 373–383 (1981).Google Scholar
Doig, P. and Flewitt, P.E.J.: Segregation of chromium to prior austenite boundaries during quenching of a 2.25 %Crl%Mo steel. Acta Mater. 29(11), 1831 (1981).CrossRefGoogle Scholar
Faulkner, R.G.: Combined grain boundary equilibrium and non-equilibrium segregation in ferritic/martensitic steels. Acta Metall. 35(12), 2905 (1987).Google Scholar
Xu, T.D., Song, S.H., Shi, H.Z., Gust, W., and Yuan, Z.X.: A method of determining the diffusion coefficient of vacancy-solute atom complexes during the segregation to grain boundaries. Acta Metall. Mater. 39(12), 3119 (1991).Google Scholar
Xu, T.D.: The critical time and critical cooling rate of non-equilibrium grain-boundary segregations. J. Mater. Sci. Lett. 7(3), 241 (1988).CrossRefGoogle Scholar
Xu, T.D.: Non-equilibrium cosegregation to grain boundaries. Scr. Mater. 37(11), 1643 (1997).Google Scholar
Li, Q.F., Yang, S.L., Li, L., Zheng, L., and Xu, T.D.: Experimental study on non-equilibrium grain-boundary segregation kinetics of phosphorus in an industrial steel. Scr. Mater. 47(6), 389 (2002).Google Scholar
Zhang, Z.L., Lin, Q.Y., and Yu, Z.S.: Grain boundary segregation in ultra-low carbon steel. Mater. Sci. Eng., A 291(1–2), 22 (2000).CrossRefGoogle Scholar
Wang, K., Si, H., Yang, C., and Xu, T.D.: Nonequilibrium grain boundary segregation of phosphorus in Ni-Cr-Fe superalloy. J. Iron Steel Res. Int. 18(1), 61 (2011).Google Scholar
Xu, T.D.: Critical time for Mg grain-boundary segregation in Ni–Cr–Co alloy. Philos. Mag. Lett. 86(8), 501 (2006).Google Scholar
Xu, T.D.: Non-equilibrium grain-boundary segregation kinetics. J. Mater. Sci. 22(1), 337 (1987).Google Scholar
Wang, K., Wang, M.Q., Si, H., and Xu, T.D.: Critical time for non-equilibrium grain boundary segregation of phosphorus in 304L stainless steel. Mater. Sci. Eng., A 485(1–2), 347 (2008).Google Scholar
Briant, C.L.: Grain boundary segregation of phosphorus in 304L stainless steel. Metall. Trans. A 16(11), 2061 (1985).Google Scholar
Briant, C.L.: Grain boundary segregation of phosphorus and sulfur in types 304L and 316L stainless steel and its effects on intergranular corrosion in the huey test. Metall. Trans. A 18(5), 691 (1987).Google Scholar
Wang, K., Xu, T.D., Song, S.H., and Shao, C.: Intermediate-temperature embrittlement induced by non-equilibrium grain-boundary segregation of sulfur in Ni–Cr–Fe alloy. Mater. Charact. 62(6), 575 (2011).CrossRefGoogle Scholar
Wang, K., Xu, T.D., Wang, Y.Q., and Du, J.H.: Intermediate-temperature embrittlement induced by non-equilibrium grain-boundary segregation of sulfur in Ni–Cr–Fe alloy. Philos. Mag. Lett. 89(11), 725 (2009).Google Scholar
Kizu, T. and Urabe, T.: Hot ductility of sulfur-containing low manganese mild steels at high strain rate. ISIJ Int. 49, 1424 (2009).Google Scholar
Karlsson, L., Norden, H., and Odelius, H.: Overview no. 63 Non-equilibrium grain boundary segregation of boron in austenitic stainless steel—I. Large scale segregation behavior. Acta Metall. 36(1), 1 (1988).CrossRefGoogle Scholar
Yuan, Z.X., Jia, J., Guo, A.M., Shen, D.D., and Song, S.H.: Experimental study on non-equilibrium grain-boundary segregation kinetics of phosphorus in an industrial steel. Scr. Mater. 48(2), 203 (2003).CrossRefGoogle Scholar
Song, S.H., Yuan, Z.X., Jia, J., Guo, A.M., and Shen, D.D.: The role of tin in the hot-ductility deterioration of a low-carbon steel. Metall. Mater. Trans. A 34(8), 1611 (2003).CrossRefGoogle Scholar
Yuan, Z.X., Jia, J., Guo, A.M., Shen, D.D., Song, S.H., and Liu, J.: Influence of tin on the hot ductility of a low-carbon steel. Acta Metall. Sin. (Engl. Lett.) 16(6), 478 (2003).Google Scholar
El-Kashif, E., Asakura, K., and Shibata, K.: Effect of cooling rate after recrystallization on P and B segregation along grain boundary in IF steels. ISIJ Int. 43(12), 2007 (2003).Google Scholar
Faulkner, R.G.: Impurity diffusion constants and vacancy–impurity binding energies in solids. Mater. Sci. Technol. 1(6), 442 (1985).CrossRefGoogle Scholar
Vorlick, V. and Flewitt, P.E.J.: Cooling induced segregation of impurity elements to grain boundaries in Fe-3 wt%Ni alloys, 2.25Cr-1Mo steel and submerged arc weld metal. Acta Metall. Mater. 42(10), 3309 (1994).Google Scholar
Song, S.H. and Xu, T.D.: Combined equilibrium and non-equilibrium segregation mechanism of temper embrittlement. J. Mater. Sci. 29(1), 61 (1994).Google Scholar
Galeand, W.F. and Totemeier, T.C.: Smithells Metals Reference Book, 8th ed. (Elsevier Butterworth-Heinemann, Burlington, MI, 2004).Google Scholar
Kizu, T., Nagakati, Y., Inazumi, T., and Hosoya, Y.: Intergranular and internal oxidation during hot-rolling process in ultra-low carbon steel. ISIJ Int. 42(2), 206 (2002).Google Scholar
Zhang, Z.L., Lin, Q.Y., and Yu, Z.S.: Non-equilibrium intergranular segregation in ultra low carbon steel. Mater. Sci. Technol. 16(3), 305 (2000).Google Scholar
Calvo, J., Cabrera, J.M., Rezaeian, A., and Yue, S.: Evaluation of the hot ductility of a C–Mn steel produced from scrap recycling. ISIJ Int. 47, 1518 (2007).Google Scholar
Yasumoto, K., Maehara, Y., Ura, S., and Ohmori, Y.: Effects of sulphur on hot ductility of low-carbon steel austenite. Mater. Sci. Technol. 1, 111 (1985).CrossRefGoogle Scholar
Kobayashi, H.: Hot-ductility recovery by manganese sulphide precipitation in low manganese mild steel. ISIJ Int. 31, 268 (1991).Google Scholar
Mclean, D.: Grain Boundaries in Metals (Oxford University Press, Oxford, UK, 1957).Google Scholar