Development of microstructure and mechanical properties of forgings in the thermomechanical treatment

• Autorzy: Opiela M.

Identyfikatory

DOI

10.15199/28.2017.5.1

Warianty tytułu

PL

Kształtowanie struktury i właściwości mechanicznych odkuwek w procesie obróbki cieplno-plastycznej

• Języki publikacji: EN

Abstrakty

EN

The work presents research results of the influence of thermomechanical treatment via forging on microstructure and mechanical properties of newly elaborated microalloyed steel containing of 0.28% C, 1.41% Mn, 0.028% Ti, 0.027% Nb, 0.019% V and 0.003% B. The investigated steel is assigned to the production of forged elements for the automotive industry. Conditions of forging using the thermomechanical processing method were developed based on plastometric tests. Observations of the microstructures of thin foils were conducted using a TITAN80-300 FEI transmission electron microscope. The applied thermomechanical treatment allows to obtain a fine-grained microstructure of the austenite during hot-working and production of forged parts. These acquire advantageous mechanical properties and guaranteed crack resistance after controlled cooling from the end plastic deformation temperature and successive tempering. Forgings produced using the thermomechanical treatment method, consecutively subjected to tempering in a temperature range from 550 to 650°C, reveal values of YS0.2 which equal from 994 to 939 MPa, UTS from 1084 to 993 MPa, KV from 69 to 109 J, KV–40 from 55 to 83 J, and a hardness ranging from 360 to 310 HBW. The results obtained in this paper make it possible to develop an industrial technology of forgings with high mechanical properties and guaranteed crack resistance, and also at a decreased temperature, by using the thermomechanical treatment method.

PL

W pracy przedstawiono wyniki badań struktury i właściwości mechanicznych odkuwek ze stali z mikrododatkami Ti, Nb, V i B typu HSLA wytworzonej w kontrolowanym procesie obróbki cieplno-plastycznej, poddanej następnie wysokiemu odpuszczaniu.

Słowa kluczowe

EN

HSLA steels; thermomechanical treatment; structure; mechanical properties

PL

stale typu HSLA; obróbka cieplno-plastyczna; struktura; właściwości mechaniczne

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2017
• Tom: Vol. 38, nr 5
• Strony: 206--211
• Opis fizyczny: Bibliogr. 22 poz., fig., tab.

Twórcy

autor

Opiela M.

• Silesian University of Technology, Institute of Engineering Materials and Biomaterials, Gliwice

Bibliografia

• [1] Gladman T.: The physical metallurgy of microalloyed steels. The Institute of Materials, London (1997).
• [2] Rodriguez-Ibabe J. M.: Thin slab direct rolling of microalloyed steels. Trans. Tech. Publications Ltd, Switzerland (2007).
• [3] Majta J.: Odkształcenie i własności. Stale mikrostopowe. Uczelniane Wydawnictwa Naukowo-Dydaktyczne, Kraków (2008).
• [4] Adrian H.: Numeryczne modelowanie procesów obróbki cieplnej. Wydawnictwa AGH, Kraków (2011).
• [5] Bleck W.: Using the TRIP effect — the dawn of a promising group of cold formable steels. Proc. of the Int. Conf. on TRIP-aided high strength ferrous alloys, ed. B. De Cooman, Ghent, Belgium (2002) 13÷24.
• [6] Karelova A., Krempaszky C., Werner E.: Hole expansion of dual-phase and complex-phase AHS-steels — effect of edge conditions. Steel Research 1 (2009) 71÷77.
• [7] Opiela M.: Analysis of the kinetics of precipitation of MX-type interstitial phases in microalloyed steels. Journal of Achievements in Materials and Manufacturing Engineering 47 (2011) 7÷18.
• [8] Kuziak R., Bołd T., Cheng Y.: Microstructure control of ferrite-pearlite high strength low alloy steels utilizing microalloying additions. Journal of Materials Processing Technology 53 (1995) 255÷262.
• [9] Balart M. J., Davis C. L., Strangwood M.: Cleavage initiation in Ti–V–N and V–N microalloyed ferritic-pearlitic forging steels. Materials Science and Engineering A 284 (2000) 1÷13.
• [10] Zhang T., Shen Y., Liu P., Yong Q., Bao Y.: New type austenite dynamic recrystallization of microalloyed forging steels 38MnVS during forging process. Journal of Iron and Steel Research 20 (2013) 57÷60.
• [11] Matlock D. K., Krauss G., Speer J. G.: Microstructures and properties of direct-cooled microalloy forging steels. Journal of Materials Processing Technology 117 (2001) 324÷328.
• [12] Ulysse P.: Thermo-mechanical characterization of forged coated products during water quench. Journal of Materials Processing Technology 209 (2009) 5584÷5592.
• [13] Skubisz P., Adrian H., Sińczak J.: Controlled cooling of drop forged microalloyed steel automative crankshaft. Archives of Metallurgy and Materials 1 (2011) 93÷107.
• [14] Skubisz P., Sińczak J., Skowronek T., Rumiński M.: Selection of direct cooling conditions for automotive lever made of microalloyed steel. Archives of Civil and Mechanical Engineering 12 (2012) 418÷426.
• [15] Gündüz S., Acarer M.: The effect of heat treatment on high temperature mechanical properties of microalloyed medium carbon steel. Materials and Design 27 (2006) 1076÷1085.
• [16] Xu L., Wang Ch., Liu G., Bai B.: Hot deformation of medium carbon V–N microalloyed steel. Transactions of Nonferrous Metals Society of China 19 (2009) 1389÷1394.
• [17] Balart M. J., Davis C. L., Strangwood M.: Fracture behavior in mediumcarbon Ti–V–N and V–N microalloyed ferritic-pearlitic and bainitic forging steels with enhanced machinability. Materials Science and Engineering A 328 (2002) 48÷57.
• [18] Caminaga C., Botta Filho W. J., Silva M. L. N.: Strengthening mechanism of 27MnSiVS6 microalloyed steel deformed by four different forging processes. Procedia Engineering 10 (2011) 512÷517.
• [19] Zhao J.: Effects of tungsten addition and heat treatment conditions on microstructure and mechanical properties of microalloyed forging steels. Materials Science and Engineering A 562 (2013) 144÷151.
• [20] El-Bitar T., Fouad N., Zaky A. I., El-Rady S. A.: Effect of cooling rate after controlled forging on properties of low carbon multi-microalloyed steels. Materials Science and Engineering A 534 (2012) 514÷520.
• [21] Opiela M., Grajcar A.: Hot deformation behavior and softening kinetics of Ti–V–B microalloyed steels. Archives of Civil and Mechanical Engineering 3 (2012) 327÷333.
• [22] Opiela M., Zalecki W., Grajcar A.: Influence of plastic deformation on CCT-diagrams of new-developed microalloyed steel. Journal of Achievements in Materials and Manufacturing Engineering 51 (2012) 78÷89.

Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).