冷轧压下率对390 MPa级IF钢组织和性能的影响
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摘要
通过观察显微组织、力学性能测试和利用三维取向分析术(ODF),研究了冷轧压下率对显微组织、力学性能、织构的影响。结果表明,随着冷轧压下率的升高,形变储能增加,退火后铁素体晶粒细小均匀,强度有所增加。变形织构{112}<110>变弱,说明提高冷轧压下率可以消除变形织构,有利织构{111}<110>增强,{001}<110>变弱,共同提高rm值。当冷轧压下率为80%时,伸长率和rm达到峰值,同时Δr较小,冲压性能最优。
Effect of cold rolling reduction ratio on microstructure,mechanical properties and texture of 390 MPa IF steel during continuous annealing was studied by observing microstructure,testing performance and analyzing texture.The results show that as the cold rolling reduction ratio increasing,stored energy and strength of the steel increase,recrystallized grain size becomes small and even,and increase cold rolling reduction ratio can eliminate the deformation texture { 112} < 110 >.{ 111} < 110 > texture increases and { 001} < 110 >texture decreases with the increasing of cold rolling reduction ratio.When the cold rolling reduction ratio is 80%,rmvalue and elongation reache the peak,while Δr value is relatively small,and the deep drawability of the steel sheets is the best.
Effect of cold rolling reduction ratio on microstructure,mechanical properties and texture of 390 MPa IF steel during continuous annealing was studied by observing microstructure,testing performance and analyzing texture.The results show that as the cold rolling reduction ratio increasing,stored energy and strength of the steel increase,recrystallized grain size becomes small and even,and increase cold rolling reduction ratio can eliminate the deformation texture { 112} < 110 >.{ 111} < 110 > texture increases and { 001} < 110 >texture decreases with the increasing of cold rolling reduction ratio.When the cold rolling reduction ratio is 80%,rmvalue and elongation reache the peak,while Δr value is relatively small,and the deep drawability of the steel sheets is the best.
引文
[1]康永林.现代汽车板工艺及成形理论与技术[M].北京:冶金工业出版社,2009.
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[11]Wang Z,Zhang P,Guo Y,et al.Recrystallization texture characteristic and drawability of a warm rolled and cold rolled interstitial-free steel[J].Journal of Materials Engineering and Performance,2006,15(6):646-650.
[12]王先进,王作成,唐获.成分及工艺对加磷高强IF钢成形性能的影响[J].钢铁,1993,28(3):34-38.WANG Xian-jin,WANG Zuo-cheng,TANG Di.Effect of chemical composition and process of extra-low-carbon P-added high-strength IF steel on drawability[J].Iron and Steel,1993,28(3):34-38.
[13]刘战英,李晋霞,李艳娇,等.冷轧压下率分配对IF钢深冲性能的影响[J].河北理工大学学报,2003,25(4):29-37.LIU Zhan-ying,LI Jin-xia,LI Yan-jiao,et al.The effect of the reduction in cold rolling IF steel sheet for drawability[J].Journal of Hebei Institute of Technology,2003,25(4):29-37.
[2]郭艳辉,王昭东,李守卫,等.IF钢与ELC钢织构及性能的对比[J].东北大学学报:自然科学版,2007,28(12):1713-1716.GUO Yan-hui,WANG Zhao-dong,LI Shou-wei,et al.Comparison of texture and properties of IF steel with ELC steel[J].Journal of Northeastern University:Natural Science,2007,28(12):1713-1716.
[3]Ghosh P,Ghosh C,Ray R K,et al.Precipitation behavior and texture formation at different stages of processing in an interstitial free high strength steel[J].Scripta Materialia,2008,59:276-278.
[4]Jeong W C.Effect of hot-rolling temperature on microstructure and texture of an ultra-low carbon Ti-interstitial-free steel[J].Materials Letters,2008,62:91-94.
[5]李守华,李俊.汽车用高强度IF钢的研究进展[J].上海金属,2007,29(5):66-70.LI Shou-hua,LI Jun.Process in research of high strength IF steel for automotive applications[J].Shanghai Metals,2007,29(5):66-70.
[6]Gupta A K,Kumar D R.Formability of galvanized interstitial-free steel sheets[J].Journal of Materials Processing Technology,2006,172(2):225-237.
[7]Hutchinson B,Artymowicz D.Mechanisms and modelling of microstructure/texture evolution in interstitial free steel sheets[J].ISIJ International,2001,41(6):533-537.
[8]吕庆功,陈光南,周家琮,等.深冲钢板的主要织构对塑性应变比的影响[J].钢铁研究,2000,116(5):40-43.LQing-gong,CHEN Guang-nan,ZHOU Jia-cong,et al.Influence of main texture components on plastic strain ratio of deep drawing steel sheet[J].Research on Iron and Steel,2000,116(5):40-43.
[9]Liu Y,Wang C,Jiang Q,et al.Individual grain orientation and heterogeneous deformation in cold-deformed interstitial-free sheet steel[J].Journal of Materials Science and Technology.2007,23(5):689-692.
[10]孙景宏.微碳深冲钢板组织演变规律和工艺优化的研究[D].北京:北京科技大学,2005.SUN Jing-hong.Research on the microstructure evolution and technology optimum of extra-low carbon steel with deep drawability[D].Beijing:USTB,2005.
[11]Wang Z,Zhang P,Guo Y,et al.Recrystallization texture characteristic and drawability of a warm rolled and cold rolled interstitial-free steel[J].Journal of Materials Engineering and Performance,2006,15(6):646-650.
[12]王先进,王作成,唐获.成分及工艺对加磷高强IF钢成形性能的影响[J].钢铁,1993,28(3):34-38.WANG Xian-jin,WANG Zuo-cheng,TANG Di.Effect of chemical composition and process of extra-low-carbon P-added high-strength IF steel on drawability[J].Iron and Steel,1993,28(3):34-38.
[13]刘战英,李晋霞,李艳娇,等.冷轧压下率分配对IF钢深冲性能的影响[J].河北理工大学学报,2003,25(4):29-37.LIU Zhan-ying,LI Jin-xia,LI Yan-jiao,et al.The effect of the reduction in cold rolling IF steel sheet for drawability[J].Journal of Hebei Institute of Technology,2003,25(4):29-37.
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