稀土对低碳高铌钢相变行为及组织的影响
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摘要
利用L78 RITA热膨胀相变仪研究了不同冷速下稀土对低碳高铌钢相变行为的影响,并结合金相法绘制了加稀土和未加稀土两种成分试验钢的连续冷却相变曲线,分析了稀土对连续冷却组织的影响规律。试验结果表明,稀土加入低碳高铌钢后使连续冷却相变曲线向右移动,在相同冷速下显著降低了奥氏体向铁素体转变的开始温度,并且随着冷速的增加使降低程度增大。冷速从0.1℃/s增加到15℃/s时,加稀土的低碳高铌相变开始温度点下降了90℃,而未加稀土的下降了52℃;另一方面,稀土对低碳高铌钢在0.1℃/s到1℃/s冷速下的组织有较大影响,促进了针状铁素体的转变,并能在冷速增至5℃/s后使其更易获得板条状贝氏体组织。
Effect of rare earth on transformation behavior of low carbon high niobium steel was studied by L78 RITA thermal dilatometer at various cooling rates. The continuous cooling curves for two kinds of test steels were obtained by metallography. The influence of rare earth on microstructures was also analyzed. The results show that the CCT curves shift to right,the transformation starting temperature of austenite to ferrite significantly reduces and the reducing degree enlarges with the imcrease of cooling rate by addition of rare earth. When the cooling rates increasing from 0. 1℃/s to 15℃/s,the transformation starting temperature of low carbon high niobium steel with rare earth falls 90℃,but steel without rare earth falls only 52℃. On the other hand,rare earth also has a great influence on the microstructures of low carbon high niobium steel. When cooling rates is during 0. 1℃/s to 1℃/s,the acicular ferrite transformation was promoted. Besides,the bainite ferrite was obtained easily when the cooling rates above 5℃/s.
Effect of rare earth on transformation behavior of low carbon high niobium steel was studied by L78 RITA thermal dilatometer at various cooling rates. The continuous cooling curves for two kinds of test steels were obtained by metallography. The influence of rare earth on microstructures was also analyzed. The results show that the CCT curves shift to right,the transformation starting temperature of austenite to ferrite significantly reduces and the reducing degree enlarges with the imcrease of cooling rate by addition of rare earth. When the cooling rates increasing from 0. 1℃/s to 15℃/s,the transformation starting temperature of low carbon high niobium steel with rare earth falls 90℃,but steel without rare earth falls only 52℃. On the other hand,rare earth also has a great influence on the microstructures of low carbon high niobium steel. When cooling rates is during 0. 1℃/s to 1℃/s,the acicular ferrite transformation was promoted. Besides,the bainite ferrite was obtained easily when the cooling rates above 5℃/s.
引文
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[2]付俊岩,东涛.试论我国钢的微合金化发展方向[J].中国冶金,2005(5):16-19.
[3]Seung Chan Hong,Sung Hwan Lim,Hyun Seon Hong,et al.Effects of Nb on strain induced ferrite transformation in C-Mn steel[J].Materials Science and Engineering 2003,A355:241-248.
[4]孔君华,郭斌,刘昌明,等.高钢级管线钢X80的研制与发展[J].材料导报,2004,18(4):23-25.
[5]Klaus Hulka,Pascoal Bordignon,Malcolm Gray.Experience of low carbon steel with 0.06 to 0.10 percent niobioum[J].Microalloying Technology,2004,4:13-17.
[6]姜茂发,王荣,李春龙.钢中稀土与铌、钒、钛等微合金元素的相互作用[J].稀土,2003,24(5):1-3.
[7]Liu HL,Liu CJ,Jiang MF.Effects of rare earths on the austenite recrystallization behavior in X80 pipeline steel[J].Advanced Materials Research,2010,129-131:542-546.
[8]李春龙.稀土在钢中的应用及研究新进展[J].稀土,2013,34(3):78-85.
[9]张朝晖,柳永宁,金波,等.铌微合金钢形变连续冷却过程中的相变[J].机械工程材料,2007,31(4):85-88.
[10]衣海龙,薛鹏,崔荣新,等.X80管线钢连续冷却过程中的相变研究[J].轧钢,2008,25(2):10-12.
[11]刘宏亮,刘承军,王云盛,等.稀土对X80管线钢中铌元素赋存状态的影响[J].稀土,2011,32(5):6-11.
[12]文建华,刘清友.冷却速率对高铌微合金钢组织的影响[J].钢铁研究学报,2007,19(12):35-39.
[13]谭峰亮,刘清友.含铌抗大变形钢管线钢奥氏体的连续冷却转变[J].钢铁研究学报,2012,24(7):35-39.
[14]杨景红.低碳高铌管线钢组织细化的控制研究[D].北京:北京科技大学,2009.
[15]周兰聚,唐立东,苗钊,等.稀土微合金化及其对钒铌沉淀相析出规律的影响[J].钢铁研究,2001,(4):10-13.
[16]彭海红,陈晔,李国宝,等.X60管线钢再结晶和过冷奥氏体连续冷却相变行为的研究[J].钢铁钒钛,2006,27(4):34-37.
[17]杨吉春,曹晓恩,银壮.稀土对X80管线钢显微组织和力学性能的影响[J].稀土,2013,34(1):16-21.
[18]梁益龙,谭起兵.稀土对Mn-RE系贝氏体钢CCT曲线及组织的影响[J].金属热处理,2009,34(8):49-51.