層狀I(lǐng)F steel-Al復(fù)合板的制備與變形機制的研究
發(fā)布時間：2018-10-11 10:14
【摘要】：為了研究層狀結(jié)構(gòu)對層狀I(lǐng)F steel-Al復(fù)合板強韌化機制的影響,本文以IF鋼、鋁箔為原料,采用熱壓-熱軋工藝制備了層狀I(lǐng)F steel-Al復(fù)合板,通過室溫拉伸試驗對不同體系的層狀復(fù)合板的力學(xué)性能進行評價。采用掃描電鏡(SEM)、透射電鏡(TEM)等方法,分析了層狀I(lǐng)F steel-Al復(fù)合板的顯微組織和界面結(jié)構(gòu);通過基于光學(xué)顯微鏡(OM)的原位拉伸試驗觀察了層狀I(lǐng)F steel-Al復(fù)合板各組元在拉伸變形過程中的形變特性。通過對IF鋼、鋁板層厚比分別為1:1、2:1、4:1和8:1的層狀I(lǐng)F steel-Al復(fù)合板進行力學(xué)性能測試,分析IF鋼、鋁層厚比對IF steel-Al復(fù)合板力學(xué)性能的影響規(guī)律;改變軋制變形量,獲得不同軋制變形量的層狀I(lǐng)F steel-Al復(fù)合板。通過對軋制態(tài)復(fù)合材料力學(xué)性能測試,分析軋制變形量對IF steel-Al復(fù)合板的力學(xué)性能的影響,并獲得優(yōu)化的制備工藝參數(shù);通過對軋制態(tài)IF steel-Al復(fù)合板界面反應(yīng)層、拉伸斷口形貌觀察以及力學(xué)性能分析,探討了軋制工藝對復(fù)合材料性能的影響;通過對IF鋼、鋁層厚比分別為1:1和8:1的IF steel-Al復(fù)合板進行基于OM的原位拉伸試驗,分析兩種復(fù)合材料的變形特點。使用SEM對層狀I(lǐng)F steel-Al復(fù)合板的微觀組織進行觀察發(fā)現(xiàn),不同層厚比熱壓態(tài)復(fù)合板各組元層厚均勻、界面平直、界面結(jié)合良好,沒有出現(xiàn)被軋裂的現(xiàn)象。隨著軋制變形量的增加和軋制道次增加,最終得到的復(fù)合材料界面反應(yīng)層厚度逐漸增加。與熱壓態(tài)IF steel-Al復(fù)合板相比,軋制態(tài)多層復(fù)合板的屈服強度、抗拉強度均有所提高。隨著軋制變形量的增加,復(fù)合板界面反應(yīng)層厚度增加,從而對復(fù)合板的力學(xué)性能產(chǎn)生影響。當軋制變形量為32%時,復(fù)合板的的力學(xué)性能最好。從層狀I(lǐng)F steel-Al復(fù)合板的拉伸斷口形貌可以看出,IF鋼層有大量的等軸狀韌窩,而Al層有明顯可見的撕裂棱,為典型的韌性斷裂。通過基于OM的原位拉伸試驗等試驗,研究層狀I(lǐng)F steel-Al復(fù)合板的變形機制。當復(fù)合板受力變形時,裂紋首先出現(xiàn)在界面反應(yīng)層,隨著外加載荷的繼續(xù)進行,反應(yīng)層中裂紋開始擴展。當反應(yīng)層中裂紋尖端應(yīng)力達到鋁的屈服強度時,鋁層開始產(chǎn)生裂紋并出現(xiàn)微屈服。當外加載荷繼續(xù)增大時,反應(yīng)層中裂紋相互連接最終貫穿整個,鋁層中裂紋連接并擴展,而IF鋼則不再受界面的約束。這時相當于單層IF鋼在外加載荷的作用下受力變形。隨后IF鋼層出現(xiàn)裂紋并擴展,直至斷裂。
[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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB331
本文編號：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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB331
【參考文獻】
相關(guān)期刊論文 前1條
1 于九明，于長生，，齊克敏，朱泉;鋼和鋁異溫軋制復(fù)合機理的研究[J];鋼鐵;1995年08期
本文編號：2263817
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