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precipitates of Nb--Ti bearing steel on the ductility of contin￾uous casting slab． ISIJ Int，2014，54( 7) : 1611 ［22］ Cho K C，Mun D J，Koo Y M，et al． Effect of niobium and tita￾nium addition on the hot ductility of boron containing steel． Mater Sci Eng A，2011，528( 10) : 3556 ［23］ Cho K C，Mun D J，Kim J Y，et al． Effect of boron precipitation behavior on the hot ductility of boron containing steel． Metall Mater Trans A，2010，41( 6) : 1421 ［24］ Cho K C，Mun D J，Kang M H，et al． Effect of thermal cycle and nitrogen content on the hot ductility of boron-bearing steel． ISIJ Int，2010，50( 6) : 839 ［25］ Cho K C，Koo Y M，Park J． Effect of cooling rate on the hot ductility of boron bearing steel during continuous casting ( study for prevention of corner crack on continuous casting slab ) ． J Korean Inst Met Mater，2008，46( 6) : 329 ［26］ Brune T，Senk D，Walpot Ｒ，et al． Hot ductility behavior of bo￾ron containing microalloyed steels with varying manganese con￾tents． Metall Mater Trans B，2015，46( 3) : 1400 ［27］ Mejia I，Salas-Ｒeyes A E，Bedolla-Jacuinde A，et al． Effect of Nb and Mo on the hot ductility behavior of a high-manganese aus￾tenitic Fe--21Mn--1. 3Al--1. 5Si--0. 5C TWIP steel． Mater Sci Eng A，2014，616: 229 ［28］ Chen X M，Song S H，Sun Z C，et al． Effect of microstructural features on the hot ductility of 2. 25Cr--1Mo steel． Mater Sci Eng A，2010，527( 10) : 2725 ［29］ Lee C H，Park J Y，Chung J H，et al． Hot ductility of medium carbon steel with vanadium． Mater Sci Eng A，2016，651: 192 ［30］ Wang X H，Zhu G S，Yu H X，et al． High temperature proper￾ties of continuous casting high carbon steels． J Univ Sci Technol Beijing，2005，27( 5) : 545 ( 王新华，朱国森，于会香，等． 高碳钢连铸板坯高温力学性 能． 北京科技大学学报，2005，27( 5) : 545) ［31］ Mintz B，Crowther D N． Hot ductility of steels and its relation￾ship to the problem of transverse cracking in continuous casting． Int Mater Ｒev，2010，55( 3) : 168 ［32］ Baradaran A H，Zarei-Hanzaki A，Abedi H Ｒ，et al． The ductil￾ity behavior of a high-Mn twining plasticity steel during cold-to￾hot deformation． Mater Sci Eng A，2013，561: 411 ［33］ Mejia I，Salas-Ｒeyes A E，Calvo J，et al． Effect of Ti and B mi￾roaddition on the hot ductility behavior of a high-Mn austenitic Fe--23Mn--1. 5Al--1. 3Si--0. 5C TWIP steel． Mater Sci Eng A， 2015，648: 311 ［34］ Hamada A S，Karjalainen L P． Hot ductility behaviour of high￾Mn TWIP steels． Mater Sci Eng A，2011，528( 3) : 1819 ［35］ Liu Y Z． Theoretical Basis of Material Forming． Beijing: Nation￾al Defense Education Press，2004 ( 刘雅政． 材 料 成 形 理 论 基 础． 北 京: 国 防 教 育 出 版 社， 2004) ［36］ Jin C Y，Cui Z S． The effect of deformation temperature on dy￾namic recrystallization． J Yangzhou Univ Nat Sci Ed． ，2011，14 ( 2) : 60 ( 金朝阳，崔振山． 变形温度对动态再结晶行为的影响． 扬 州大学学报( 自然科学版) ，2011，14( 2) : 60) ［37］ Kang S E，Tuling A，Banerjee J Ｒ，et al． Hot ductility of TWIP steels． Mater Sci Technol，2011，27( 1) : 95 ［38］ Ｒyan N D，McQueen H J． Comparison of dynamic softening in 301，304，316 and 317 stainless steels． High Temp Technol， 1990，8( 3) : 185 ［39］ McQueen H J，Jonas J J． Ｒecent advances in hot working: fun￾damental dynamic softening mechanisms． J Appl Metalwork， 1984，3( 3) : 233 ［40］ McQueen H J，Jin N，Ｒyan N D． Ｒelationship of energy dissipa￾tion efficiency to microstructural evolution in hot working of AISI 304 steel． Mater Sci Eng A，1995，190( 1-2) : 43 ［41］ Salas-Ｒeyes A E，Mejia I，Bedolla-Jacuinde A，et al． Hot duc￾tility of high-Mn austenitic Fe--22Mn--1. 5Al--1. 5Si--0. 45C TWIP steels microalloyed with Ti and V． Mater Sci Eng A， 2014，611: 77 ［42］ Charleux M，Poole W J，Militzer M，et al． Precipitation behavior and its effect on strengthening of an HSLA-Nb /Ti steel． Metall Mater Trans B，2001，32( 7) : 1635 · 825 ·