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·964· 北京科技大学学报 第33卷 在610~590℃的温度区间内存在,590℃以下时微 发生晶内针状铁素体形核的相变区域,如图10(a) 观组织以粒状贝氏体和板条贝氏体为主.由此可以 所示中LAF区域,即针状铁素体的相变温度要高于 看出,在TTT图中贝氏体相变区域的上部存在一个 其他贝氏体组织. 700a 钛脱氧钢 700 铝脱氧钢 铁素体 650 650 铁素体 纤状铁素体 ool ● 550 550 贝氏体 贝氏体 500 500 40 455055606570 40455055606570 图10实验钢焊接TTT曲线图.(a)Ti脱氧钢:(b)Al脱氧钢 Fig.10 Welding TTT curves of test steels:(a)Ti-deoxidized steel:(b)Al-deoxidized steel dation on solidification and post-solidification microstructure in low 3结论 carbon high manganese steel.IS//Int,2007,47 (9):1255 5 (1)Ti脱氧钢中的夹杂物以尺寸小于3m的 Shim J H,Cho Y W,Chung S H,et al.Nucleation of intragranu- lar ferrite at Ti2O;particle in low carbon steel.Acta Mater,1999, 类球状Ti,0一MnS型复合夹杂为主,核心部分的 47(9):2751 Ti,0包括Ti203和Ti0,两种类型. [6 Lee JL,Pan Y T.The formation of intragranular acicular ferrite in (2)Ti,0-Mns型复合夹杂物在焊接热循环过 simulated heat-affected zone.IS/J Int,1995,35 (8):1027 程中能够诱导针状铁素体优先在其表面形核,从而 ] Homma H,Ohkita S,Matsuda S,et al.Improvement of HAZ toughness in HSLA steel by introducing finely dispersed Ti-oxide. 导致T脱氧钢的贝氏体相变开始温度高于A!脱氧 Veld J,1987,66(10):301 钢,贝氏体相变开始时间也比A!脱氧钢提前. 8] Al Hajeri K F,Garcia C I,Hua M,et al.Particle-stimulated nu- cleation of ferrite in heavy steel sections.ISI Int,2006,46(8): 参考文献 1233 [1]Takamura J,Mizoguhci S.Roles of oxides in steels performance 9 Shu W,Wang X M,Li S R,et al.Influence of second-phase par- 1/Proceedings of the 6th International Iron and Steel Congress ticles containing Ti on microstructure and properties of weld-heat- ISIJ,Nagoya,1990:591 affected-gone of a microalloy steel.Acta Metall Sin,2010,46 Mizoguhci S,Takamura J.Control of oxides as inoculants//Pro- (8):997 ceedings of the 6th International Iron and Steel Congress ISIJ,Na- (舒玮,王学敏,李书瑞,等.含T复合第二相粒子对微合金钢 gya,1990:598 焊接热影响区组织和性能的影响.金属学报,2010,46(8): B]Madariaga I,Gutierrez I.Role of the particle-matrix interface on 997) the nucleation of acicular ferrite in a medium carbon microalloyed 10]Bhadeshia H K D H,Sevensson L E,Gretoft B.A model for the steel.Acta Mater,1999,47(3):951 development of microstructure in low-alloy steel (Fe-Mn-Si-C) 4]Kikuchi N,Nabeshima S,Kishimoto Y,et al.Effect of Ti deoxi- weld deposits.Acta Metall,1985,33(7):1271北 京 科 技 大 学 学 报 第 33 卷 在 610 ~ 590 ℃ 的温度区间内存在,590 ℃ 以下时微 观组织以粒状贝氏体和板条贝氏体为主. 由此可以 看出,在 TTT 图中贝氏体相变区域的上部存在一个 发生晶内针状铁素体形核的相变区域,如图 10( a) 所示中 IAF 区域,即针状铁素体的相变温度要高于 其他贝氏体组织. 图 10 实验钢焊接 TTT 曲线图. ( a) Ti 脱氧钢; ( b) Al 脱氧钢 Fig. 10 Welding TTT curves of test steels: ( a) Ti-deoxidized steel; ( b) Al-deoxidized steel 3 结论 ( 1) Ti 脱氧钢中的夹杂物以尺寸小于 3 μm 的 类球状 TixO--MnS 型 复 合 夹 杂 为 主,核 心 部 分 的 TixO 包括 Ti2O3 和 Ti3O5 两种类型. ( 2) TixO--MnS 型复合夹杂物在焊接热循环过 程中能够诱导针状铁素体优先在其表面形核,从而 导致 Ti 脱氧钢的贝氏体相变开始温度高于 Al 脱氧 钢,贝氏体相变开始时间也比 Al 脱氧钢提前. 参 考 文 献 [1] Takamura J,Mizoguhci S. Roles of oxides in steels performance / / Proceedings of the 6th International Iron and Steel Congress ISIJ,Nagoya,1990: 591 [2] Mizoguhci S,Takamura J. Control of oxides as inoculants / / Pro￾ceedings of the 6th International Iron and Steel Congress ISIJ,Na￾goya,1990: 598 [3] Madariaga I,Gutierrez I. Role of the particle-matrix interface on the nucleation of acicular ferrite in a medium carbon microalloyed steel. Acta Mater,1999,47( 3) : 951 [4] Kikuchi N,Nabeshima S,Kishimoto Y,et al. Effect of Ti de-oxi￾dation on solidification and post-solidification microstructure in low carbon high manganese steel. ISIJ Int,2007,47( 9) : 1255 [5] Shim J H,Cho Y W,Chung S H,et al. Nucleation of intragranu￾lar ferrite at Ti2O3 particle in low carbon steel. Acta Mater,1999, 47( 9) : 2751 [6] Lee J L,Pan Y T. The formation of intragranular acicular ferrite in simulated heat-affected zone. ISIJ Int,1995,35 ( 8) : 1027 [7] Homma H,Ohkita S,Matsuda S,et al. Improvement of HAZ toughness in HSLA steel by introducing finely dispersed Ti-oxide. Weld J,1987,66( 10) : 301 [8] Al Hajeri K F,Garcia C I,Hua M,et al. Particle-stimulated nu￾cleation of ferrite in heavy steel sections. ISIJ Int,2006,46( 8) : 1233 [9] Shu W,Wang X M,Li S R,et al. Influence of second-phase par￾ticles containing Ti on microstructure and properties of weld-heat￾affected-zone of a microalloy steel. Acta Metall Sin,2010,46 ( 8) : 997 ( 舒玮,王学敏,李书瑞,等. 含 Ti 复合第二相粒子对微合金钢 焊接热影响区组织和性能的影响. 金属学报,2010,46 ( 8) : 997) [10] Bhadeshia H K D H,Sevensson L E,Gretoft B. A model for the development of microstructure in low-alloy steel ( Fe-Mn-Si-C) weld deposits. Acta Metall,1985,33( 7) : 1271 ·964·
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