Si含量对DP-600级别热轧双相钢组织及性能的影响

发布时间：2018-04-14 16:36

本文选题：DP热轧双相钢 + 微观组织　；参考：《材料热处理学报》2015年09期

【摘要】：采用光学显微镜、扫描电镜、纳米力学探针、透射电镜等技术对不同Si含量(0.03%和1.077%)的DP600级别热轧双相钢单向拉伸过程组织特征进行研究,分析了Si含量对相同工艺条件下双相钢显微组织特征,以及塑性变形过程中强化相与基体协调变形行为的影响。结果表明:Si作为一种铁素体形成元素,能够增加铁素体的形核率,具有细化铁素体晶粒的作用,可增加铁素体体积分数,分割并细化马氏体。Si含量的增加促进了C元素向马氏体富集,提升了单位体积马氏体的碳含量,使部分板条马氏体转变为孪晶马氏体,增加了马氏体硬度。由于Si对铁素体的净化作用,高Si实验钢中位错在铁素体中滑移时不易受到碳化物的钉扎作用。因此在相同工艺条件下,Si含量的增加可以提高双相钢的抗拉强度,提高硬度,降低屈强比。
[Abstract]:By means of optical microscope, scanning electron microscope, nanomechanical probe and transmission electron microscope, the microstructure of DP600 grade hot rolled duplex steel during uniaxial tension was studied by means of 0.03% and 1.077% Si content.The effect of Si content on the microstructure of duplex steel under the same process conditions and the coordinated deformation behavior of strengthening phase and matrix during plastic deformation were analyzed.The results show that as a ferrite forming element, w Si can increase the nucleation rate of ferrite, refine the grain size of ferrite, and increase the volume fraction of ferrite.The increase of partitioning and refinement of martensite 路Si promoted the enrichment of element C into martensite, increased the carbon content of unit volume martensite, transformed some lath martensite into twin martensite and increased martensite hardness.Due to the purification of ferrite by Si, dislocation in high Si experimental steel is not easily pinned by carbides when it slips in ferrite.Therefore, under the same technological conditions, the increase of Si content can increase the tensile strength, increase the hardness and reduce the yield ratio of the duplex steel.
【作者单位】：北京科技大学材料科学与工程学院;包头钢铁(集团)公司技术中心;
【基金】：中央高校基本科研业务费专项资金(FRF-TP-12-046A) 北京高校“青年英才计划”(YETP0355)
【分类号】：TG142.1

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