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第6期 郭守真等:铌对低碳钢形变强化相变的影响 .589 量增加,变形诱导Nb(CN)析出粒子数量增多,至应 出,而在形变强化相变过程中还伴随着Nb(CN)的 变量约1.0时d。=9.94nm,n=5.038× 动态析出,无论是Nb(CN)的应变诱导析出还是动 10-5nm2,则L,≈437.4nm,f≈0.026%(图5) 态析出,都促进了铁素体的转变, 证明在铁素体相变前出现了Nb(CN)应变诱导析 (b) 100nm 100 nm 图5含铌钢760℃、1s'变形沉淀相的透镜像(碳膜萃取复型).(a)飞=0.1:(b)8=0.56:(c)8=0.77:()飞=0.99 Fig-5 TEM micrographs of the carbon extraction replica of Nb-microalloyed steel deformed at 760C with Is(a)=0.1:(b)=0.56;(c) e=0.77:(d)8=0.99 Technol,2001,117,341 3结论 [6]Hodgson P D.Hickson M R,Gibbs R K.Ultrafine ferrite in low carbon steel.Scripta Mater.1999.40(10):1179 (1)含铌钢在奥氏体区变形,Nb(CN)析出颗粒 [7]Hurley P J.Kelly JL.Hodgson P D.Ultrafine ferrite formation 对随后的形变强化相变有明显的促进作用,转变动 during hot strip rolling.Mater Sci Technol.2000.16(11/12): 力学有所提前, 1273 (2)含铌钢的过冷奥氏体在A3~A3之间变 [8]Priestner R.Hodgson P D.Ferrite grain coarsening during trans 形,可以得到平均晶粒尺寸为1.9m的形变强化相 formation of thermomechanically processed C Mn Nb austenite. 变铁素体,其在形变前期以形变强化相变为主 Mater Sci Technol.1992.8(10):849 [9]陈国安,杨王玥,郭守真,等.低碳微量铌钢过冷奥氏体形变过 参考文献 程中的碳氨化物析出.北京科技大学学报,2005,27(3):302 [10]Hoogendoorn T M.Spanraft MJ.Quantifying the effect of mi- [1]杨王玥,胡安民,齐俊杰,等。低碳钢形变强化相变的组织细 croalloying elements on structures during processing//Proceed- 化.材料研究学报,2001,15(2):171 ings of an International Symposium on High Strength Low Alloy [2]Sun ZQ.Yang W Y.QiJJ.et al.Deformation enhanced trans- Steels-Microalloying 1975.Washington D C:Union Carbide formation and dynamic recrystallization of ferrite in a low carbon Corp,1975:75 steel during multipass hot deformation.Mater Sci Eng.2002. [11] 徐温崇,马翔,孙福玉.Nb一V微合金化钢中析出相的非水电 A334(9):201 解恒电流萃取法的研究及其应用.钢铁,1985,20(3):34 [3]Lewis J.Jonas JJ.Mintz B.The formation of deformation in- [12]齐俊杰,杨王玥,孙祖庆。低碳钢过冷奥氏体形变过程中的组 duced ferrite during mechanical testing.ISIJ Int.1998.38(3): 织及取向变化.金属学报,2002,38(6):629 300 [13] Gladman T.Dulieu D.Mcivor I D.Structure property relation- [4]Pandi R.YueS.Dynamic transformation of austenite to ferrite in ships in high strength microalloyed steeProceedings of an In low carbon steel.ISIJ Int.1994,34(3):270 ternational Symposium on High Strength Low Alloy Steels-Mi- [5]Niikura M,Fujioka M,Adachi Y,et al.New concept for ultra eroalloying 1975.Washington D C:Union Carbide Corp.1975: refinement of grain size in Super Metal Project.J Mater Process 32量增加‚变形诱导 Nb(CN)析出粒子数量增多‚至应 变量 约 1∙0 时 dp =9∙94 nm‚ns =5∙038× 10-5 nm -2‚则 Lp≈437∙4nm‚f ≈0∙026%(图5). 证明在铁素体相变前出现了 Nb(CN)应变诱导析 出‚而在形变强化相变过程中还伴随着 Nb(CN)的 动态析出.无论是 Nb(CN)的应变诱导析出还是动 态析出‚都促进了铁素体的转变. 图5 含铌钢760℃、1s -1变形沉淀相的透镜像(碳膜萃取复型).(a) ε=0∙1;(b) ε=0∙56;(c) ε=0∙77;(d) ε=0∙99 Fig.5 TEM micrographs of the carbon extraction replica of Nb-microalloyed steel deformed at760℃ with1s -1:(a) ε=0∙1;(b) ε=0∙56;(c) ε=0∙77;(d) ε=0∙99 3 结论 (1) 含铌钢在奥氏体区变形‚Nb(CN)析出颗粒 对随后的形变强化相变有明显的促进作用‚转变动 力学有所提前. (2) 含铌钢的过冷奥氏体在 A3~ A r3之间变 形‚可以得到平均晶粒尺寸为1∙9μm 的形变强化相 变铁素体‚其在形变前期以形变强化相变为主. 参 考 文 献 [1] 杨王 ‚胡安民‚齐俊杰‚等.低碳钢形变强化相变的组织细 化.材料研究学报‚2001‚15(2):171 [2] Sun Z Q‚Yang W Y‚Qi J J‚et al.Deformation enhanced trans￾formation and dynamic recrystallization of ferrite in a low carbon steel during multipass hot deformation.Mater Sci Eng‚2002‚ A334(9):201 [3] Lewis J‚Jonas J J‚Mintz B.The formation of deformation in￾duced ferrite during mechanical testing.ISIJ Int‚1998‚38(3): 300 [4] Pandi R‚Yue S.Dynamic transformation of austenite to ferrite in low carbon steel.ISIJ Int‚1994‚34(3):270 [5] Niikura M‚Fujioka M‚Adachi Y‚et al.New concept for ultra refinement of grain size in Super Metal Project.J Mater Process Technol‚2001‚117:341 [6] Hodgson P D‚Hickson M R‚Gibbs R K.Ultrafine ferrite in low carbon steel.Scripta Mater‚1999‚40(10):1179 [7] Hurley P J‚Kelly J L‚Hodgson P D.Ultrafine ferrite formation during hot strip rolling.Mater Sci Technol‚2000‚16(11/12): 1273 [8] Priestner R‚Hodgson P D.Ferrite grain coarsening during trans￾formation of thermomechanically processed C-Mn-Nb austenite. Mater Sci Technol‚1992‚8(10):849 [9] 陈国安‚杨王 ‚郭守真‚等.低碳微量铌钢过冷奥氏体形变过 程中的碳氮化物析出.北京科技大学学报‚2005‚27(3):302 [10] Hoogendoorn T M‚Spanraft M J.Quantifying the effect of mi￾croalloying elements on structures during processing∥Proceed￾ings of an International Symposium on High Strength Low Alloy Steels-Microalloying 1975.Washington D C:Union Carbide Corp‚1975:75 [11] 徐温崇‚马翔‚孙福玉.Nb-V 微合金化钢中析出相的非水电 解恒电流萃取法的研究及其应用.钢铁‚1985‚20(3):34 [12] 齐俊杰‚杨王 ‚孙祖庆.低碳钢过冷奥氏体形变过程中的组 织及取向变化.金属学报‚2002‚38(6):629 [13] Gladman T‚Dulieu D‚Mcivor I D.Structure-property relation￾ships in high-strength microalloyed steels∥Proceedings of an In￾ternational Symposium on High Strength Low Alloy Steels-Mi￾croalloying1975.Washington D C:Union Carbide Corp‚1975: 32 第6期 郭守真等: 铌对低碳钢形变强化相变的影响 ·589·
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