层状IF steel-Al复合板的制备与变形机制的研究
发布时间：2018-10-11 10:14
【摘要】：为了研究层状结构对层状IF steel-Al复合板强韧化机制的影响,本文以IF钢、铝箔为原料,采用热压-热轧工艺制备了层状IF steel-Al复合板,通过室温拉伸试验对不同体系的层状复合板的力学性能进行评价。采用扫描电镜(SEM)、透射电镜(TEM)等方法,分析了层状IF steel-Al复合板的显微组织和界面结构;通过基于光学显微镜(OM)的原位拉伸试验观察了层状IF steel-Al复合板各组元在拉伸变形过程中的形变特性。通过对IF钢、铝板层厚比分别为1:1、2:1、4:1和8:1的层状IF steel-Al复合板进行力学性能测试,分析IF钢、铝层厚比对IF steel-Al复合板力学性能的影响规律;改变轧制变形量,获得不同轧制变形量的层状IF steel-Al复合板。通过对轧制态复合材料力学性能测试,分析轧制变形量对IF steel-Al复合板的力学性能的影响,并获得优化的制备工艺参数;通过对轧制态IF steel-Al复合板界面反应层、拉伸断口形貌观察以及力学性能分析,探讨了轧制工艺对复合材料性能的影响;通过对IF钢、铝层厚比分别为1:1和8:1的IF steel-Al复合板进行基于OM的原位拉伸试验,分析两种复合材料的变形特点。使用SEM对层状IF steel-Al复合板的微观组织进行观察发现,不同层厚比热压态复合板各组元层厚均匀、界面平直、界面结合良好,没有出现被轧裂的现象。随着轧制变形量的增加和轧制道次增加,最终得到的复合材料界面反应层厚度逐渐增加。与热压态IF steel-Al复合板相比,轧制态多层复合板的屈服强度、抗拉强度均有所提高。随着轧制变形量的增加,复合板界面反应层厚度增加,从而对复合板的力学性能产生影响。当轧制变形量为32%时,复合板的的力学性能最好。从层状IF steel-Al复合板的拉伸断口形貌可以看出,IF钢层有大量的等轴状韧窝,而Al层有明显可见的撕裂棱,为典型的韧性断裂。通过基于OM的原位拉伸试验等试验,研究层状IF steel-Al复合板的变形机制。当复合板受力变形时,裂纹首先出现在界面反应层,随着外加载荷的继续进行,反应层中裂纹开始扩展。当反应层中裂纹尖端应力达到铝的屈服强度时,铝层开始产生裂纹并出现微屈服。当外加载荷继续增大时,反应层中裂纹相互连接最终贯穿整个,铝层中裂纹连接并扩展,而IF钢则不再受界面的约束。这时相当于单层IF钢在外加载荷的作用下受力变形。随后IF钢层出现裂纹并扩展,直至断裂。
[Abstract]:In order to study the effect of layered structure on the strengthening and toughening mechanism of layered IF steel-Al composite plate, the layered IF steel-Al composite plate was prepared by hot pressing and hot rolling process with IF steel and aluminum foil as raw materials. The mechanical properties of laminated plates with different systems were evaluated by tensile test at room temperature. The microstructure and interface structure of layered IF steel-Al composite plate were analyzed by means of scanning electron microscope (SEM),) transmission electron microscope (TEM) and other methods. In situ tensile tests based on optical microscope (OM) were carried out to investigate the deformation characteristics of each component of a layered IF steel-Al composite plate during tensile deformation. By testing the mechanical properties of the IF steel, the layer thickness ratio of aluminum plate and the layer thickness ratio of 1: 1: 2: 1: 4: 1 and 8:1, respectively, the mechanical properties of the IF steel and the aluminum layer thickness ratio are analyzed, and the influence of the ratio of the IF steel to the aluminum layer thickness on the mechanical properties of the IF steel-Al composite plate is analyzed, and the rolling deformation is changed. The laminated IF steel-Al composite plate with different rolling deformation was obtained. The effect of rolling deformation on the mechanical properties of IF steel-Al composite plate was analyzed by testing the mechanical properties of rolled composite materials, and the optimized preparation parameters were obtained. The effect of rolling process on the properties of the composite was investigated by observing the tensile fracture morphology and analyzing the mechanical properties. The in-situ tensile tests based on OM were carried out on the IF steel-Al composite plates with the ratio of 1:1 and 8:1 for IF steel and aluminum layer thickness, respectively. The deformation characteristics of the two composites are analyzed. The microstructure of layered IF steel-Al composite plate was observed by SEM. It was found that the thickness of each element was uniform, the interface was straight, the interface was well bonded, and there was no phenomenon of rolling crack in different thickness ratio of hot pressed composite plate. With the increase of rolling deformation and rolling pass, the thickness of the interface reaction layer increases gradually. Compared with hot-pressed IF steel-Al composite plate, the yield strength and tensile strength of rolled multilayer composite plate are improved. With the increase of rolling deformation, the thickness of the reaction layer at the interface of the composite plate increases, which has an effect on the mechanical properties of the composite plate. When the rolling deformation is 32, the mechanical properties of the composite plate are the best. From the tensile fracture morphology of the laminated IF steel-Al composite plate, it can be seen that there are a large number of equiaxed dimples in the IF steel layer, while the tearing edges are obvious in the Al layer, which is a typical ductile fracture. The deformation mechanism of laminated IF steel-Al composite plate was studied by in-situ tensile test based on OM. When the composite plate is subjected to deformation, the crack first appears in the interface reaction layer, and the crack in the reaction layer begins to propagate as the applied load continues. When the crack tip stress in the reaction layer reaches the yield strength of aluminum, the aluminum layer begins to produce cracks and appear micro-yield. When the applied load continues to increase, the cracks in the reaction layer are connected with each other, and the cracks in the aluminum layer are connected and propagated, while the IF steel is no longer constrained by the interface. This is equivalent to the deformation of single layer IF steel under applied load. Then the IF steel layer appears crack and propagates until fracture.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB331
本文编号：2263817
[Abstract]:In order to study the effect of layered structure on the strengthening and toughening mechanism of layered IF steel-Al composite plate, the layered IF steel-Al composite plate was prepared by hot pressing and hot rolling process with IF steel and aluminum foil as raw materials. The mechanical properties of laminated plates with different systems were evaluated by tensile test at room temperature. The microstructure and interface structure of layered IF steel-Al composite plate were analyzed by means of scanning electron microscope (SEM),) transmission electron microscope (TEM) and other methods. In situ tensile tests based on optical microscope (OM) were carried out to investigate the deformation characteristics of each component of a layered IF steel-Al composite plate during tensile deformation. By testing the mechanical properties of the IF steel, the layer thickness ratio of aluminum plate and the layer thickness ratio of 1: 1: 2: 1: 4: 1 and 8:1, respectively, the mechanical properties of the IF steel and the aluminum layer thickness ratio are analyzed, and the influence of the ratio of the IF steel to the aluminum layer thickness on the mechanical properties of the IF steel-Al composite plate is analyzed, and the rolling deformation is changed. The laminated IF steel-Al composite plate with different rolling deformation was obtained. The effect of rolling deformation on the mechanical properties of IF steel-Al composite plate was analyzed by testing the mechanical properties of rolled composite materials, and the optimized preparation parameters were obtained. The effect of rolling process on the properties of the composite was investigated by observing the tensile fracture morphology and analyzing the mechanical properties. The in-situ tensile tests based on OM were carried out on the IF steel-Al composite plates with the ratio of 1:1 and 8:1 for IF steel and aluminum layer thickness, respectively. The deformation characteristics of the two composites are analyzed. The microstructure of layered IF steel-Al composite plate was observed by SEM. It was found that the thickness of each element was uniform, the interface was straight, the interface was well bonded, and there was no phenomenon of rolling crack in different thickness ratio of hot pressed composite plate. With the increase of rolling deformation and rolling pass, the thickness of the interface reaction layer increases gradually. Compared with hot-pressed IF steel-Al composite plate, the yield strength and tensile strength of rolled multilayer composite plate are improved. With the increase of rolling deformation, the thickness of the reaction layer at the interface of the composite plate increases, which has an effect on the mechanical properties of the composite plate. When the rolling deformation is 32, the mechanical properties of the composite plate are the best. From the tensile fracture morphology of the laminated IF steel-Al composite plate, it can be seen that there are a large number of equiaxed dimples in the IF steel layer, while the tearing edges are obvious in the Al layer, which is a typical ductile fracture. The deformation mechanism of laminated IF steel-Al composite plate was studied by in-situ tensile test based on OM. When the composite plate is subjected to deformation, the crack first appears in the interface reaction layer, and the crack in the reaction layer begins to propagate as the applied load continues. When the crack tip stress in the reaction layer reaches the yield strength of aluminum, the aluminum layer begins to produce cracks and appear micro-yield. When the applied load continues to increase, the cracks in the reaction layer are connected with each other, and the cracks in the aluminum layer are connected and propagated, while the IF steel is no longer constrained by the interface. This is equivalent to the deformation of single layer IF steel under applied load. Then the IF steel layer appears crack and propagates until fracture.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB331
【参考文献】
相关期刊论文 前1条
1 于九明，于长生，，齐克敏，朱泉;钢和铝异温轧制复合机理的研究[J];钢铁;1995年08期
本文编号：2263817
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