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采用累积叠轧压方法,研究了TA1/Q235钢累积叠压变形特性及界面组织.研究结果表明:随着总应变的增加,TA1与Q235钢的变形程度的差别增大,当真应变大于1.0时二者的变形差基本上维持在1.0左右.TA1的应变在850～900℃范围内发生突变,并伴随着径向变形差值增大.当变形温度小于850℃时,在Q235钢侧,呈现出非常明显的垂直于压缩方向的变形组织;当复合变形温度为850～950℃时,在Q235钢侧出现了明显的铁素体柱状晶组织,晶粒排列整齐,几乎都垂直于界面,并且随着温度升高,铁素体晶粒粗化.当累积变形量小于1.5、变形温度为850℃时,金属间化合物的厚度为0.7～1μm,当累积变形量为2.0时厚度约1.7μm.当累积变形量为1.0时,在700～850℃条件下压制,界面化合物层厚度变化不大,为0.8～1μm,900℃时其厚度增加了1倍多,950℃时达到约2.3μm.
The cumulative lamination deformation characteristics and interfacial microstructure of TA1 / Q235 steel were studied by accumulative overlap rolling method.The results show that with the increase of total strain, the difference of deformation degree of TA1 and Q235 steel increases, and when the true strain is greater than 1.0 The deformation of the two is basically maintained at about 1.0.TA1 strain in the 850 ~ 900 ℃ range of mutations, and with the radial deformation of the difference increases.When the deformation temperature is less than 850 ℃, Q235 steel side, showing A very obvious deformation of the organization perpendicular to the direction of compression; when the composite deformation temperature is 850 ~ 950 ℃, obvious ferrite columnar crystal structure appears on the Q235 steel side, the grains are arranged neatly, almost perpendicular to the interface, and As the temperature increases, the ferrite grains coarsen.When the cumulative deformation is less than 1.5 and the deformation temperature is 850 ° C, the intermetallic compound has a thickness of 0.7 to 1 μm and a thickness of about 1.7 μm when the cumulative deformation amount is 2.0. When the cumulative deformation is 1.0, the thickness of the interfacial compound layer does not change much at the temperature of 700-850 ℃. The thickness of the interfacial compound layer is 0.8-1μm. The thickness of the interfacial compound layer is more than doubled at 900 ℃ and about 2.3μm at 950 ℃.