通过单道次压缩变形热模拟试验，研究微合金钢加热到两相区变形时的组织演变规律，并分析加热温度对其的影响。使用OM、SEM和EBSD分析试验钢的微观组织和取向分布。结果表明，加热后奥氏体相变在晶界上发生，740～800℃时奥氏体体积分数为20%左右，830℃时奥氏体体积分数大幅增加到50%。加热到两相区变形时，形变铁素体发生动态回复或动态再结晶，随变形温度增加，形变铁素体由动态回复向动态再结晶发展，亚晶界减少，830℃时大角度晶界比例达到91.2%，冷却后得到均匀的细晶组织，平均有效晶粒直径3.9μm。
The microstructure evolution of microalloyed steel deformed in dual-phase region after heating was studied by single pass thermal-compression simulation. And the effect of heating temperature was analyzed. OM,SEM and EBSD were applied to investigate the microstructure and orientation relationship. The results show that austenite formed at prior grain boundary after heating to different temperature. The fraction of austenite at 740-800℃was about 20%,and it in-creased sharply to 50%at 830℃. Dynamic recovery and dynamic recrystallization took place in the deformed ferrite after heated to dual-phase region. With the increase of temperature,dynamic recovery of deformed ferrite transforms to dynam-ic recrystallization,which reduced the amount of subgrain. Homogeneous refined ferrite was obtained by deforming at 830℃. The fraction of high angle grain boundary reached to 91.2%,and the effective grain diameter was 3.9μm.
参考文献
| [1] | Song R;Ponge D;Raabe D et al.Overview of processing,mi-crostructure and mechanical properties of ultrafine grained bcc steels[J].Mater Sci Eng:A,2006,441(1/2):1. |
| [2] | Seung Chan HONG;Sung Hwan LIM;Kyung Jong LEE .Effect of Undercooling of Austenite on Strain Induced Ferrite Transformation Behavior[J].ISIJ International,2003(3):394-399. |
| [3] | Najafi-Zadeh A;Jonas J J;Yue S .Grain refinement by dynamic recrystallization during the simulated warm-rolling of interstitial free steels[J].Metall Trans:A,1992,23(9):2607. |
| [4] | P.D.Hodgson;M.R.Hickson;R.K.Gibbs .ULTRAFINE FERRITE IN LOW CARBON STEEL[J].Scripta materialia,1999(10):1179-1184. |
| [5] | M.R. HICKSON;P.J. HURLEY;R.K. GIBBS .The Production of Ultrafine Ferrite in Low-Carbon Steel by Strain-Induced Transformation[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2002(4):1019-1026. |
| [6] | 范建文,谢瑞萍,张维旭,王彦锋,阎智平.表层超细晶粒普碳钢中厚板的工业试制[J].钢铁,2006(04):40-46,55. |
| [7] | Ishikawa T;Nomiyama Y;Yoshikawa H.Ultra-high crack-arresting steel plate(HIAREST)with super-refined grains in sur-face layers[J].Nippion Steel Tech Report,1997(11):31. |
| [8] | 姚连登,李自刚,张丕军.超细晶粒及超高韧性厚板的研究[J].钢铁钒钛,2005(01):20-25. |
| [9] | Hidesato MABUCHI;Toshiei HASEGAWA;Tadashi ISHIKAWA .Metallurgical Features of Steel Plates with Ultra Fine Grains inSurface Layers and their Formation Mechanism[J].ISIJ International,1999(5):477-485. |
| [10] | 齐俊杰,杨王玥,孙祖庆.低碳钢过冷奥氏体形变过程超细铁素体的形成[J].金属学报,2002(09):897-902. |
| [11] | 徐光,徐楚韶,赵嘉蓉,刘显军,熊俊伟.超低碳IF钢铁素体动态再结晶研究[J].钢铁,2006(06):63-66. |
| [12] | 李龙飞,杨王,孙祖庆,王青峰.低碳钢铁素体相区变形特性[J].北京科技大学学报,2001(03):225-229. |
| [13] | 姚圣杰,杜林秀,刘相华,王国栋.超细晶奥氏体在两相区大变形后的瞬态组织[J].材料研究学报,2008(06):572-576. |
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