| تعداد نشریات | 24 |
| تعداد شمارهها | 889 |
| تعداد مقالات | 7,942 |
| تعداد مشاهده مقاله | 15,011,475 |
| تعداد دریافت فایل اصل مقاله | 12,736,159 |
Grain Refinement of Dual Phase Steel via Tempering of Cold-Rolled Martensite | ||
| Iranian Journal of Materials Forming | ||
| مقاله 2، دوره 5، شماره 1، تیر 2018، صفحه 19-25 اصل مقاله (594.9 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijmf.2017.26349.1089 | ||
| نویسندگان | ||
| M. Najafi1؛ H. Mirzadeh* 2؛ M. Alibeyki1 | ||
| 1University of Tehran | ||
| 2College of Engineering - University of Tehran | ||
| چکیده | ||
| A microstructure consisting of ultrafine grained (UFG) ferrite with average grain size of ~ 0.7 µm and dispersed nano-sized carbides was produced by cold-rolling and tempering of the martensite starting microstructure in a low carbon steel. Subsequently, fine grained dual phase (DP) steel consisting of equiaxed ferrite grains with average size of ~ 5 µm and martensite islands with average size of ~ 3 µm was produced by intercritical annealing of this microstructure. Coarse grained DP steel with average ferrite grain size of ~ 20 µm and average martensite island size of ~ 5 µm was also produced by intercritical annealing of the as-received ferritic-pearlitic microstructure. The UFG microstructure showed high strength, low ductility, and poor work hardening response due to intense grain refinement. The fine grained DP steel had higher tensile strength and total elongation compared with the coarse grained one, which was related to the improved work-hardening behavior by microstructural refinement. | ||
| کلیدواژهها | ||
| DP steels؛ Microstructure؛ Mechanical properties؛ Thermomechanical processing | ||
| مراجع | ||
|
[1] H. Azizi-Alizamini, M. Militzer, W.J. Poole, Formation of ultrafine grained dual phase steels through rapid heating, ISIJ International 51 (2011) 958-964. [2] C.C. Tasan, M. Diehl, D. Yan, M. Bechtold, F. Roters, L. Schemmann, C. Zheng, N. Peranio, D. Ponge, M. Koyama, K. Tsuzaki, D. Raabe, An overview of dual-phase steels: Advances in microstructure-oriented processing and micromechanically guided design, Annual Review of Materials Research 45 (2015) 19.1-19.41. [3] H. Mirzadeh, M. Alibeyki, M. Najafi, Unraveling the initial microstructure effects on mechanical properties and work-hardening capacity of dual phase steel, Metallurgical and Materials Transactions A, in press. [4] N. Saeidi, M. Karimi, M.R. Toroghinejad, Development of a new dual phase steel with laminated microstructural morphology, Materials Chemistry and Physics 192 (2017) 1-7. [5] Y. Okitsu, N. Takata, N. Tsuji, Ultrafine ferrite formation through cold-rolling and annealing of low-carbon dual-phase steel, Materials Science and Technology 31 (2015) 745-754. [6] M. Mazinani, W.J. Poole, Effect of martensite plasticity on the deformation behavior of a low-carbon dual-phase steel, Metallurgical and materials transactions A 38 (2007) 328-339. [7] R. Kuziak, R. Kawalla, S. Waengler, Advanced high strength steels for automotive industry, Archives of Civil and Mechanical Engineering 8 (2008) 103-117. [8] M. Calcagnotto, D. Ponge and D. Raabe, Effect of grain refinement to 1 μm on strength and toughness of dual-phase steels, Materials Science and Engineering A 527 (2010) 7832-7840. [9] Y. Mazaheri, A. Kermanpur, A. Najafizadeh, Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing, ISIJ International 55 (2015) 218-226. [10] H. Ashrafi, M. Shamanian, R. Emadi, N. Saeidi, A novel and simple technique for development of dual phase steels with excellent ductility, Materials Science and Engineering A 680 (2017) 197-202. [11] S.A. Etesami, M.H. Enayati, Microstructural Evolution and Recrystallization Kinetics of a Cold-Rolled, Ferrite-Martensite Structure During Intercritical Annealing, Metallurgical and Materials Transactions A 47 (2016) 3271-3276. [12] R. Ueji, N. Tsuji, Y. Minamino, Y. Koizumi, Ultragrain refinement of plain low carbon steel by cold rolling and annealing of martensite, Acta Materialia 50 (2002) 4177-4189. [13] M. Najafi, H. Mirzadeh, M. Alibeyki, Toward unraveling the mechanisms responsible for the formation of ultrafine grained microstructure during tempering of cold rolled martensite, Materials Science and Engineering A 670 (2016) 252-255. [14] H. F. Lan, W. J. Liu, X. H. Liu, Ultrafine Ferrite Grains Produced by Tempering Cold-rolled Martensite in Low Carbon and Microalloyed Steels, ISIJ International 47 (2007) 1652-1657. [15] S. Malekjani, I.B. Timokhina, I. Sabirov, P.D. Hodgson, Deformation Behaviour of Ultrafine Grained Steel Produced by Cold Rolling of Martensite, Canadian Metallurgical Quarterly 48 (2009) 229-236. [16] B. Pawłowski, Critical points of hypoeutectoid steel - prediction of the pearlite dissolution finish temperature Ac1f, Journal of Achievements in Materials and Manufacturing Engineering 49 (2011) 331-337. [17] G.E. Dieter: Mechanical Metallurgy, 3rd ed., McGraw-Hill, New York, 1988. [18] R. Song, D. Ponge, D. Raabe, Improvement of the work hardening rate of ultrafine grained steels through second phase particles, Scripta Materialia 52 (2005) 1075-1080. [19] G. Krauss, Steels Processing, Structure, and Performance, 2nd edition, ASM International, 2015. | ||
|
آمار تعداد مشاهده مقاله: 9,149 تعداد دریافت فایل اصل مقاله: 1,374 |
||