采用静态拉伸、金相、TEM等方法,对两种不同锰含量Fe-Mn-Si-Al系TWIP钢进行表征,研究了成分、应变速率以及应变量对孪晶、位错、层错等亚结构的影响.结果表明:孪晶形成的临界应变量εc与层错能、原始晶粒尺寸以及应变速率有关;两种钢在以10-4s-1的应变速率加载时孪晶体积分数的增长曲线符合Boltzmann模型S曲线关系,孪晶增长速度先增大后减小,Fe25Mn3Si3Al钢在ε＝0.2时孪晶增长速率达到最大,Fe30Mn3Si3Al钢在ε＝0.27时孪晶增长速率最大.Fe25Mn3Si3Al钢以10-2s-1的应变速率加载时,孪晶体积分数呈线性上升;TEM观察发现孪晶总是在高密度位错与层错区产生,位错、层错的塞积,位错、层错以及孪晶间的交互作用共同引起材料强度的提高.
参考文献
| [1] | Georg FROMMEYER;Udo BRUX;Peter NEUMANN .Supra-Ductile and High-Strength Manganese-TRIP/TWIP Steels for High Energy Absorption Purposes[J].ISIJ International,2003(3):438-446. |
| [2] | Grassel O.;Frommeyer G.;Meyer LW.;Kruger L. .High strength Fe-Mn-(Al, Si) TRIP/TWIP steels development - properties - application[J].International Journal of Plasticity,2000(10/11):1391-1409. |
| [3] | Bouaziz.O;Guelton.N .Modelling of TWIP effect on work-hardening[J].Materials Science and Engineering,2001,11:246-249. |
| [4] | Mahajan.S;Williams.D.F.Deformation twinning in metals and alloys[J].Acta Metallurgica,1978(18):43-61. |
| [5] | Mahajan.S;Chin.G.Y.Formation of deformation twinning in fcc crystals[J].Acta Metallurgica,1973(21):1353-1363. |
| [6] | Mori.T;Fujita.H.Dislocation reactions during deformation in Cu-11at.%Al single crystals[J].Acta Metallurgy,1980(28):771-776. |
| [7] | M. A. MEYERS;O. VOHRINGER;V. A. LUBARDA .THE ONSET OF TWINNING IN METALS: A CONSTITUTIVE DESCRIPTION[J].Acta materialia,2001(19):4025-4039. |
| [8] | Schramm.R.E;Reed.R.P .Stacking fault energies of seven commercial austenitic stainless steels[J].Metallurgical and Materials Transactions,1975,6:1345-1351. |
| [9] | Steven Vercammen .Processing and tensile behaviour of TWIP steels:Microstucture and textural analysis[D].,2004. |
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