Izvestiya MGTU MAMIIzvestiya MGTU MAMI2074-05302949-1428Moscow Polytechnic University6807910.17816/2074-0530-68079Research ArticleEffect of thermomechanical processing schedule on microstructure and mechanical properties of ultra high strength steel forgingsSkubiszP.Ph.D.; +48 (12) 617-41-41pskubisz@metal.agh.eduSinczakJ.D.Sc. Prof; +48 (12) 617-41-41-PackoM.Ph.D.; +48 (12) 617-41-41-MordalskaK.B.Sc.; +48 (12) 617-41-41-LisieckiL.M.Sc.; +48 (12) 617-41-41-AGH University of Science and Technology, Cracow, Poland2005201372-210110530042021Copyright © 2013, Skubisz P., Sinczak J., Packo M., Mordalska K., Lisiecki L.2013The paper presents results of determination and industrial verification of cooling cycles in thermomechanical processing (TMP) of steel AISI 4130, designed to produce good combination of strength and ductility directly after forging and quenching. The results indicate possibility of replacement costly high alloy steels with common grades offering higher strength in combination with good plasticity after cost-effective TMP cycles utilizing blast-air cooling from controlled forge end temperature.thermomechanical treatmenthot forgingdirect coolingultra-high strength steel 4130термомеханическая обработкагорячая ковкапрямое охлаждениесверхпрочная сталь 4130[Liu H., Liu W., Bao J., Xing Z., Song B., Lei C. Journal of Materials Engineering and Performance Vol. 20 (1) February 2011, 1-10.][Zhong J., Sun M., Liu D., Li X., Liu T. International Journal of Minerals, Metallurgy and Materials Vol.17, No.3, Jun 2010, 282-289.][Jahazi M. (1998) Metals and Materials Vol. 4, No. 4 (1998) 818-822.][ASM Handbook vol. 4, Heat Treating. ASM International Handbook Committee, Ohio 1996.][Skubisz P., Sinczak J., Skowronek T., Ruminski M. Archives of Civil and Mechanical Engineering, vol. 12, 2012, 418-426.][Skubisz P., Sinczak J., Adrian H. Archives of Metallurgy and Metals, Materials, Vol. 56, 1, 2011, 93-107.][Skubisz P., Micek P., Sinczak J., Tumidajewicz M. Solid State Phenomena, Vol. 177, 2011, 76-83.]