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利用扫描电镜、背散射电子衍射和透射电镜等表征方法,系统研究了微合金元素Nb和V对高强度管线钢组织结构与力学性能的影响。结果表明:在热机械控制工艺态,两种材料均为铁素体+贝氏体两相组织,Nb添加实验钢析出相数量高于V添加实验钢;在调质态下,两种样品的组织均为细小的贝氏体铁素体,均达到高强度管线钢X80的力学性能要求;与Nb元素相比,V的添加能使实验钢在回火过程中析出更加细小、弥散的碳化物,V适合用于热处理态材料的生产。Nb、V两种微合金元素对材料基体组织的影响没有显著性差异,Nb的晶粒细化效果优于V,V的沉淀强化效果优于Nb。 相似文献
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本文研究了Mo对Nb微合金钢动态再结晶的影响。初始奥氏体晶粒尺寸,固溶体中微合金元素的数量以及变形条件(温度和应变率)都影响着Nb钢和Nb—Mo钢的动态再结晶动力学。微合金奥氏体的动态再结晶行为采用连续扭转实验来进行证明,实验后将样品再次加热到1100℃和1460℃之间的不同温度,这就会产生一个很宽的初始奥氏体晶粒尺寸,即从22μm到805μm之间。实验发现Zener—Hollomon参数值下降,初始晶粒尺寸促进动态再结晶。固溶体中的Mo元素推迟动态再结晶过程,提高了和值,这都受Mo含量的影响。这就意味着对于Nb钢,Nb—Ti钢和Nb—Mo钢产生最高的应变值存在唯一的关系。 相似文献
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Nb对C-Si-Mn-Cr双相钢相变规律、组织和性能的影响 总被引:4,自引:0,他引:4
根据C Si Mn Cr和C Si Mn Cr Nb实验钢的相变规律,在实验室进行了控轧控冷实验研究,分析了微合金元素Nb对高强度热轧双相钢相变规律、组织和性能的影响。实验结果表明,Nb可显著推迟铁素体和珠光体转变,并显著降低铁素体开始转变温度,但对铁素体终止转变温度和贝氏体转变温度区间基本没有影响。经Nb微合金化后,实验钢的屈服强度和抗拉强度增幅均在100 MPa以上,屈服强度的增幅高于抗拉强度,且在强度大幅度升高的同时,伸长率下降并不明显,表明Nb的细晶强化作用对提高中温卷取热轧双相钢强度级别的效果明显。 相似文献
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以两种微合金化方式(Nb、V、Ti和Nb、V、Ti、Mo)的X70管线钢为研究对象,在MMS-200热模拟试验机上进行了双道次轧制工艺模拟试验,研究不同卷取温度、冷却速度对X70显微组织的影响.结果表明,随着卷取温度的降低及冷速的提高,金相组织细化.卷取温度在520℃、冷速在15℃/s左右可以得到较为理想的针状铁素体组织.Nb、V、Ti微合金化管线钢,当冷却速度为15℃/s时,带状组织完全消失. 相似文献
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采用真空感应熔炼、锻造、轧制、热处理等工艺得到Nb元素含量分别为4.99%、5.13%、5.34%、5.50%的四种GH4169合金,研究了Nb元素含量对GH4169合金组织和拉伸性能的影响。结果表明:随着Nb元素含量的增加,GH4169合金两组室温屈服强度和抗拉强度的均值分别由1124.5 MPa和1402 MPa提高至1152.5 MPa和1489 MPa,两组650℃屈服强度和抗拉强度的均值分别由867.5 MPa和1035 MPa提高至975.0 MPa和1105 MPa,室温拉伸塑性略有降低,但650℃拉伸塑性几乎无变化,说明Nb元素含量的增加促进了主要强化相γ″的析出和长大,同时金相观察表明同样促进了晶界δ相的析出。 相似文献
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The precipitation behavior of a Nb (0.041 wt%), V (0.11 wt%), and Ti (0.018 wt%) micro‐alloyed steel influenced by a deformation process in the austenite region has been investigated by transmission electron microscopy and atom probe. After solution annealing at 1250°C, nearly the entire Nb and V amount is in solid solution. Ti does not go into in solid solution and stays stable as TiN precipitates. During the cooling process to deformation temperature, these TiN precipitates act as nucleation sites for Nb and V. Precipitates with a TiN rich core and a V‐rich shell are formed. Nb is homogenously distributed over the precipitate. After deformation, strain induced precipitates occur, which consist mainly of Nb, V, and only a little Ti. Smaller strain induced precipitates have a higher N‐content than C, with growth the C‐content increases. 相似文献
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The influence of the micro alloying elements B, Ti and Nb on the recrystallization texture and mechanical properties of iron aluminium light‐weight steels, particularly with reference to their improved deep drawing properties was investigated. Depending on the combination of the alloying elements the microstructures of the investigated micro alloyed Fe‐6Al steels are influenced by grain refinement. Likewise, variable combinations of micro alloying elements differently affect the texture. Generally, the mechanical properties are improved. However, small amounts of B, Ti and Nb cause superior deep drawing and stretch forming properties of these iron aluminium light‐weight steels The microstructures of various micro alloyed cold rolled Fe‐6Al steel sheets were evaluated by optical microscopy, scanning electron microscopy (SEM) inclusively EDAX and X‐ray diffraction. Texture measurements were performed using a goniometer with a closed Eulerian cradle and analysed by ODF calculations. Tensile tests were carried out at room temperature and 200 °C, respectively. The deep drawing behaviour was determined by performing cupping tests and digitalised strain analysis. 相似文献
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根据成分及性能要求,采用中碳、高锰、添加少量的铌、钒、钛微合金化元素的低成本成分设计,通过强化冶炼控制、连铸操作、轧钢温度控制等措施,济钢厚板厂批量生产了A572Gr65高强钢板。检验结果表明,钢板强度、低温冲击韧性等性能指标优良,满足用户要求。 相似文献