TA1/Q235钢累积叠压变形特性及界面组织

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.

Deformation characteristic and interface microstructure of TA1/Q235 during accumulative roll-bonding

The deformation characteristic and interface microstructure of TA1/Q235 during deformation process were studied with accumulative roll-bonding (ARB) technology. It was found that the difference of deformation between TA1 and Q235 enlarged with increasing total strain. When the true strain exceeded 1.0, the difference kept about 1.0. An abrupt change point of the TA1 ' s strain was observed between 850℃ and 900℃, and rose with increasing the difference of radial deformation. When the deformation temperature was less than 850 ℃, obvious deformation microstructure appeared on the side of Q235, which was vertical to the compression direction. When the deformation temperature is between 850℃ and 900℃, obvious ferrite columnar grains were found. The ferrite columnar grains regularly arranged on the side of Q235, and nearly all of them were vertical to the interface. As the temperature increased, the ferrite grains became coarsening. Under the condition of the cumulative deformation less than 1.5 and the deformation temperature of 850℃, the thickness of intermetallic compounds was 0.7 to 1 μm ; when the cumulative deformation increased to 2.0, its thickness was about 1.7 μm. When the cumulative deformation was 1.0 and the deformation temperature is between 700℃and 850 ℃, the thickness of interface compounds was 0.8 to 1 μm. But when the deformation temperature was 900℃ the thickness increased more than one time, and was 2.3 μm when the deformation temperature is 950℃.