TA2-Q235B爆炸复合板钢侧组织特征

借助光学显微镜、电子背散射衍射和扫描电子显微镜等测试技术和手段,系统地研究热处理温度对TA2--Q235B爆炸复合板钢侧组织转变的影响,并分析了其形成机理.结果表明:在热处理过程中,钢侧界面组织发生脱碳,形成完全由铁素体组织组成的脱碳层,这些铁素体没有织构特征;当热处理温度在850℃及以下时,钢侧界面组织在靠近波头漩涡的地方发生异常长大,形成粗大的铁素体;当热处理温度在900℃及以上时,钢侧界面组织在钛钢复合界面上发生异常长大,产生柱状的铁素体组织.这些组织的形成受到碳元素的扩散和钢侧基体组织相变的共同作用.热处理过程中,界面产生的TiC在界面上分布不均,随温度升高,在界面局部富集,从而加速了碳元素向界面的扩散.

Microstructure features of the steel side in TA2-Q235B explosive clad plates

The effect of heat treatment temperature on the microstructure transformation of the steel side in TA2-Q235B explosive clad plates was studied by optical microscopy(OM),electron backscatter diffraction(EBSD) and scanning electron microscopy(SEM),and the formation mechanism was also analyzed.During the heat treatment process,the interface structure of the steel side decarburized,and a decarburized layer which is comprised of ferrite without structure characters formed.At 850 ℃ and below,the interface structure of the steel side near the swirl of the wave tip developed abnormally into big ferrite.At 900 ℃ and above,the interface structure of the steel side unusually grew into a columnar-structure ferrite structure.These aforesaid structures are influenced by both carbon diffusion and the phase transformation of matrix microstructure in the steel side.During the heat treatment process,TiC generated on the interface unevenly distributed on the interface,and locally accumulated on the interface with the increase of temperature,which accelerates the diffusion of carbon to the interface.