(1. 蘭州理工大學 省部共建有色金屬先進加工與再利用國家重點實驗室，蘭州 730050；
2. 蘭州理工大學 有色金屬合金及加工教育部重點實驗室，蘭州 730050)
摘 要: 先采用熱浸鍍鋁-鋅工藝對Q235鋼板進行表面鍍層處理，后將液態(tài)的A356鋁合金定量澆覆于經預熱的鋼板表面，通過液固鑄軋成功制備鋁/鋼復合板。運用光學顯微鏡(OM)、SEM觀察界面結合與組織形貌，結合EDS、XRD分析界面物相成分，并測試微觀硬度、室溫拉伸和剪切強度。結果表明：隨著澆覆溫度的提高，復合板界面間隙消失，整體趨勢上擴散層厚度逐漸增加。當澆覆溫度為710 ℃及以上時，界面處會形成Fe3Al、FeAl、FeAl2、Fe2Al5和FeAl3相。在同一澆覆溫度下，硬度整體趨勢為在Q235和A356基體中保持穩(wěn)定，而在從Q235側距界面中心100 μm至A356側距界面中心100 μm的范圍內連續(xù)下降。抗拉強度和剪切強度都表現(xiàn)出先增加后減小的趨勢，澆覆溫度為710 ℃時，復合板的成形質量最佳，抗拉強度和剪切強度都為最大，分別為336.4 MPa和137.6 MPa。
關鍵字: 鋁/鋼復合板；液固鑄軋法；界面組織；界面擴散；力學性能
（1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Nonferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China）
Abstract:The hot-dip aluminizing-zinc process was used to pre-treat the low-carbon steel plates, and then the aluminum/low-carbon steel clad plates were successfully fabricated by liquid-solid twin-roll casting (LSTRC). The microstructure observation and interface combination of the clad plates were investigated by optical microscope (OM) and scanning electrical microscope (SEM), and the phase composition was measured by energy dispersive spectrometer (EDS) as well as X-ray diffractometer (XRD). In addition, with the mechanical properties of the clad plates were characterized by microhardness, room temperature tensile and shear tests. The results show that the interface gaps of the clad plates disappear and the overall trend of the thickness of the diffusion layer gradually increase when the covering temperature increasing. In the LSTRC process, when the pouring temperature is 710 ℃ and above, Fe3Al, FeAl, FeAl2, Fe2Al5 and FeAl3 phases are formed at the interface. At the same covering temperature, the overall microhardness trend is stable in the Q235 and A356 substrates, and the microhardness decreases continuously from Q235 side distance interface center about 100 μm to A356 side distance interface center about 100 μm. The tensile strength and shear strength of the clad plates increase firstly and decrease later. When the A356 covering temperatures is 710 ℃, the tensile strength and shear strength reach the highest value, which are 336.4 MPa and 137.6 MPa, respectively.
Key words: Al/low-carbon steel clad plates; liquid-solid twin-roll casting; interfacial microstructure; interfacial diffusion; mechanical properties
