F45MnVS钢热变形行为及组织性能研究
发布时间：2018-08-09 15:30
【摘要】：近年来我国对非调质钢的研究与应用高度重视,但国内生产的F+P型高强度、高韧性非调质钢的研究和应用都较少,需要对其展开进一步细致的研究工作。本文针对南钢生产的F45MnVS高强度非调质钢的需求,从非调质钢的热轧工艺,化学成分,非调质钢强度和韧性入手,对F45MnVS非调质钢的动态CCT曲线,显微组织、常规力学性能、动态再结晶行为、对该钢进行调质处理正交实验,与非调质钢的性能进行对比、以及F45MnVS钢的终轧力学性能计算进行了重点研究。论文的主要内容如下:1.利用Gleeble-2000对F45MnVS钢进行动态CCT实验,测定了F45MnVS钢的奥氏体相变温度,AC1=720℃,AC3=774℃;F45MnVS钢的动态CCT曲线,主要有三种组织转变:(1)冷速较低,冷速范围为0.1℃/s~5℃/s时,主要发生F+P转变;(2)中等冷速,冷速范围为7℃/s~10℃/s时,可以看出组织为贝氏体组织,发生贝氏体转变;(3)冷速为12℃/s及以上,可以看出组织中的马氏体组织,发生马氏体转变。2.利用Gleeble-2000对F45MnVS钢进行单道次压缩实验。根据实验数据绘制了不同热变形条件下F45MnVS钢的应力-应变曲线,剖析了变形条件与变形抗力以及再结晶之间的联系;计算出F45MnVS钢的再结晶激活能为418.583KJ/mol,给出了F45MnVS钢热变形时的变形抗力公式和变形本构方程。3.F45MnVS钢的组织为F+P,用于制造汽车轴类零件,但其强度有余而韧性不足。通过对F45MnVS钢进行调质处理实验,与非调质的性能进行对比。得出结论:本正交实验设计中的最优工艺为将实验钢加热到800℃,保温20min,以水为介质,进行淬火;再将实验钢加热到600℃,保温60min,取出空冷。由此调质工艺处理后,F45MnVS钢获得细小的回火索氏体组织,韧性最好,冲击功AKu值达到155J。4.由电子结构计算的方法,根据F45MnVS钢的化学成分,终轧奥氏体晶粒度,结合F45MnVS钢轧制过程中的固溶强化,细晶强化,弥散强化,析出强化,珠光体转变,计算出F45MnVS钢的终轧力学性能:σb值为901.65MPa,?值为14.75%,AKu值为53.58J,与实验值有较好的吻合。
[Abstract]:In recent years, China attaches great importance to the research and application of non-quenched and tempered steels, but the research and application of F-P type high strength and high toughness non-quenched and tempered steels produced in China are few, so it is necessary to carry out further and detailed research work on them. In this paper, according to the demand of F45MnVS high strength non-quenched and tempered steel produced by Nangang, the dynamic CCT curve, microstructure and conventional mechanical properties of F45MnVS non-quenched and tempered steel are studied from the aspects of hot rolling process, chemical composition, strength and toughness of non-quenched and tempered steel. The dynamic recrystallization behavior of the steel was studied by means of the orthogonal test of tempering and tempering, and the comparison between the properties of the steel and the non-quenched and tempered steel, as well as the calculation of the final rolling mechanical properties of F45MnVS steel. The main contents of the thesis are as follows: 1: 1. The austenitic transformation temperature of F45MnVS steel was measured by dynamic CCT test with Gleeble-2000. The dynamic CCT curves of F45MnVS steel were measured at 774 鈩，
本文编号：2174528
[Abstract]:In recent years, China attaches great importance to the research and application of non-quenched and tempered steels, but the research and application of F-P type high strength and high toughness non-quenched and tempered steels produced in China are few, so it is necessary to carry out further and detailed research work on them. In this paper, according to the demand of F45MnVS high strength non-quenched and tempered steel produced by Nangang, the dynamic CCT curve, microstructure and conventional mechanical properties of F45MnVS non-quenched and tempered steel are studied from the aspects of hot rolling process, chemical composition, strength and toughness of non-quenched and tempered steel. The dynamic recrystallization behavior of the steel was studied by means of the orthogonal test of tempering and tempering, and the comparison between the properties of the steel and the non-quenched and tempered steel, as well as the calculation of the final rolling mechanical properties of F45MnVS steel. The main contents of the thesis are as follows: 1: 1. The austenitic transformation temperature of F45MnVS steel was measured by dynamic CCT test with Gleeble-2000. The dynamic CCT curves of F45MnVS steel were measured at 774 鈩，
本文编号：2174528
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