Recent progress of external field processing technology in Сhina

Авторы

Ключевые слова:

electromagnetic casting, ultrasonic-electric surface modification, electro-plastic treatment, electro-plastic rolling

Аннотация

External field processing technology is an advanced forming technology to apply in the liquid forming and solid forming. In this article, the state of the art of external field processing in China is reviewed considering: basic research work regarding the process principle, the resulting work piece deformation, and the energy transfer during the process; application-oriented research work and applications in the field of rolling, cutting and process combinations. To describe the interaction of the multiple physics fields (electromagnetic field, fluid flow, heat transfer and solidification) during the electromagnetic stirring process a comprehensive mathematic model was developed. It is shown that the numerical magnetic flux density and temperature are in good qualitative agreement with the measurements. It is established that due to the electromagnetic force, the molten steel is forced to flow toward the magnetic field traveling direction in the region where the magnetic field imposed. The molten steel flow is decelerated in proportion to the imposed electromagnetic force. In the investigations current frequency effect on the electroplastic rolling (ER) in AZ31 magnesium alloy it is shown that the mechanical properties, microstructure, and texture are highly current frequency-dependent. Best mechanical properties are obtained from 500 Hz ER specimen by carrying out tensile tests for all the rolled strips. Besides, the frequencies of twin boundaries, which are reduced to the minimum at 500 Hz, vary with the current frequency. The effect of electroplastic-differential speed rolling (EDSR) on manufacturing thin AZ31 strip was investigated and it is shown that the ductility of rolled strip is significantly enhanced by EDSR, with an acceptable decrease of tensile strength compared to the strip by ER, which may be attributed to the fully dynamic recrystallization (DRX) and tilted basal poles in the EDSR sample. An ultrasonic-electric surface modification (UESM) treatment, under different vibration frequencies, was employed to improve the surface properties of 2316 stainless steel. A grain refinement layer was formed on the specimen’s surface after UESM treatment.

Библиографические ссылки

Sprecher A.F., Mannan S.L., Conrad H. On the mechanisms for the electroplastic effect in metals // Acta Metal. Mater. 1986. No. 34. P. 1145 – 1162.

Lv B., Qiao S., Sun X. Exploration on repair-ing fatigue damage of steel specimens with magnetic treatment // Scripta Mater. 1999. No. 40. P. 767 – 771.

Liu Y., Zhao X., Wang D. Determination of the plastic properties of materials treated by ultrasonic surface rolling process through instrumented indentation // Mater Sci Eng: A. 2014. No. 600. P. 21 – 31.

Okazaki K., Kagawa M., Conrad H. A study of the electroplastic effect in metal // Scripta Metal. Mater, 1978. No. 12. P. 1063 – 1068.

Fan Z. International Materials Reviews, 2002. No. 47. P. 1 – 37.

Tang M., Xu J., Zhang Z., Bai Y. Effects of annulus gap on flow and temperature field in electromagnetic direct chill casting pro-cess // Trans. Non-ferrous Met Soc. China. 2011. No. 21. P. 1123 – 1129.

Dong J., Cui J. Effect of low-frequency electromagnetic field on microstructures and macrosegregation of Φ270 mm DC ingots of an Al–Zn–Mg–Cu–Zr alloy // Mater Letts. 2005. No. 59. P. 1502 – 1506.

Dong J., Cui J., Ban C., Liu X. Effect of Low Frequency Electromagnetic Casting on the Castability, Microstructure, and tensile properties of DC cast Al-Zn-Mg-Cu Alloy // Metallurgical and Materials Transactions A. 2004. No. 35. P. 2487 – 2494.

Conrad H., Sprecher A.F. Dislocations in Solids. – Elsvier: Amsterdam, 1989. P. 497 – 540.

Liu W., Liang K., Zheng Y., Cui J. Influ-ence of homogenization treatment in an electric field on the workability of 1420 Al-Li alloy during hot rolling // Journal of mate-rials science letters. 1996. No. 15. P. 1918 – 1920.

Jiang Y., Tang G., Shek C., Zhu Y., Xu Z. On the thermodynamics and kinetics of electropulsing induced dissolution of β-Mg17Al12 phase in an aged Mg–9Al–1Zn alloy // Acta Mater. 2009. No. 57. P. 4797 – 4808.

Liu W., Cui J. A study on the ageing treat-ment of 2091 Al-Li alloy with an electric field // Journal of materials science letters. 1997. No. 16. P. 1410 – 1411.

Conrad H., Guo Z., Sprecher A. Effect of electropulse duration and frequency on grain growth in Cu // Scripta Metal. Mater. 1990. No. 24. P. 359 – 362.

Xu Z., Tang G., Ding F., Tian S., Tian H. Applied Physics A. 2007. No. 88. P. 429 – 433.

Gromov V.E., Ivanov Y.F., Stolboushkina O.A., Konovalov S.V.. Dislocation substruc-ture evolution on Al creep under the action of the weak electric potential // Mater. Sci. Eng: A. 2010. No. 527. P. 858 – 861.

Asai S. Recent development and prospect of electromagnetic processing of materials // Sci. and Tech. of Advanced Materials. 2000. No. 1. P. 191 – 200.

Hao H., Jin J., Zhang X. Joule heating in electromagnetic casting // Sci. and Tech. of Advanced Materials. 2001. No. 2. P. 93 – 96.

Troitskii O.A., Likhtman V.I. The anisotro-py of the electron and gamma-irradiation ac-tion on the deformation process of zinc sin-gle crystals in a brittle state // Dokl Akad Nauk S.S.S.R, 1963. No. 148. P. 332 – 334.

Kravchenko V.Y. Role of electron wind in electroplastic deformation of metals // J. Exp. Theoret. Phys. U.S.S.R. 1966. No. 511. 976 p.

Klimov K.M., Shnyrevm G.O., Novikov I.I. Electroplastic effect in metals // Soviet Phys. Dokl. 1975. No. 19. P. 787.

Wang H., Zhu M., Yu H. Numerical Analy-sis of Electromagnetic Field and Flow Field in High Casting Speed Slab Continuous Casting Mold With Traveling Magnetic Field // Journal of Iron and Steel Research. 2010. No. 17. P. 25 – 30.

Zhang H., Cui J. Production of super-high strength aluminum alloy billets by low fre-quency electromagnetic casting // Trans. Non-ferrous Met. Soc. China. 2011. No. 21. P. 2134 – 2139.

Li X., Tang G., Kuang J., Li X., Zhu J. Ef-fect of current frequency on the mechanical properties, microstructure and texture evolu-tion in AZ31 magnesium alloy strips during electroplastic rolling // Mater. Sci. Eng: A. 2014. No. 612. P. 406 – 413.

Li X., Wang F., Li X., Tang G., Zhu J. Im-provement of formability of Mg–3Al–1Zn alloy strip by electroplastic-differential speed rolling // Mater. Sci. Eng: A. 2014. No. 618. P. 500 – 504.

Ion S.E., Humphreys F.J., White S.H. Dy-namic Recrystallisation and the Develop-ment of Microstructure during the High Temperature Deformation of Magnesium // Acta Metallurgia. 1982. No. 30. P. 1909 – 1919.

Liu D., Li X., Tang G., Chen L., Wang H. An ultrasonic-electric surface modification of stainless steel treatment // Materials Sci-ence and Technology. 2014. Submission.

Ye Y., Li X., Tang G. The effect of elec-tropulsing assisted ultrasonic impact treat-ment on the mechanical properties and mi-crostructure evolution of steel // Materials Science and Technology. 2014. Submission.

Опубликован

30.09.2017

Выпуск

Раздел

Металлургия и материаловедение