Effect of Heating Temperature on Microstructure and Mechanical Properties of Q235/Ti Composites Plates with Ni Interlayer
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摘要: 以Ni为中间层制备钛/钢轧制复合板,借助扫描电镜、能谱仪、X射线衍射仪和Instron万能拉伸试验机等分析手段,研究了850~950℃加热温度对钛钢复合板力学性能和显微组织的影响。结果表明:当加热温度在850~900℃时,剪切强度随温度升高而升高;加热温度为900~950℃时,剪切强度随温度升高而降低,最高剪切强度都在900℃时获得。以Ni为中间层有效阻止了Fe和C等元素扩散到Ti侧形成金属间化合物,界面化合物种类不随温度变化,但化合物量随温度升高而增加。轧制温度为850℃时,界面上金属间化合物非常少,对应的剪切强度最低;轧制温度为900℃时,复合板界面剪切强度最优,与之相对应的界面结构是较为充分的元素扩散以及少量的金属间化合物;轧制温度为950℃时,金属间化合物层急剧变厚,TiNi3和孔洞急剧增多,因而严重削弱了界面的剪切强度。Abstract: In this paper,a comparative experiment was carried out to prepare titanium/steel rolled composite plates under different heating temperature conditions with Ni as intermediate layer.Scanning electron microscope,energy spectrometer,X-ray diffractometer and Instron universal tensile testing machines and other analytical methods were used to study the effects of heating temperature on the mechanical properties and microstructure of the composite sheets.The results show that when the heating temperature is 850~900 ℃,the shear strength of resulted composite plate increases with the increase of temperature,when the heating temperature is 900~950 ℃,the shear strength decreases with the increase of temperature.The highest shear strength is obtained at 900 ℃.When Ni is used as the intermediate layer,elements such as Fe and C can be effectively prevented from diffusing to the Ti side to form an intermetallic compound,the type of the interface compound does not change with temperature but the number of interfacial compound increases with increasing temperature.When the rolling temperature is 850 ℃,there are very few intermetallic compounds at the interface,and the corresponding shear strength is the lowest.When the rolling temperature is 900 ℃,the interfacial shear strength of the composite plate is the best,and the corresponding interface structure is more sufficient,the element diffusion and a small amount of intermetallic compounds.When the rolling temperature is 950 ℃,the intermetallic compound layer sharply thickens,TiNi3 and pores increase sharply,thus seriously weakening the shear strength of the interface.
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