真空热轧Q345B碳钢-304不锈钢复合板界面Cr、Ni扩散行为研究

Research on Diffusion Behavior of Cr and Ni at Interface of Vacuum Hot-Rolled Q345B Carbon Steel-304 Stainless Steel Clad Plate

研究了60 mm Q345B碳钢/10 mm 304不锈钢复合板坯在1200℃仅加热不轧制及进行2倍压缩比轧制后30 mm Q345/5 mm 304复合界面Cr、Ni的扩散行为。试验结果表明,加热过程中,界面是否贴合并未影响扩散的进行,真空状态下不锈钢侧Cr、Ni发生蒸发逸出不锈钢并向碳钢侧发生了扩散,Cr扩散距离大于Ni。轧制后复合界面建立冶金结合,界面两侧浓度差异驱动Cr、Ni继续向碳钢侧扩散,初始加热扩散区被轧薄,复合界面两侧,Cr浓度差异小,Ni浓度差异大;2倍压缩比轧制后,不锈钢侧仅形成了宽度20μm的贫Cr区及10μm的贫Ni区。

The diffusion behavior of Cr and Ni in the bonding interface of 60 mm Q345B carbon steel/10 mm 304 stainless steel clad plate being heated at 1200℃without rolling and being rolled to 30 mm Q345/5 mm 304 clad plate with 2 times compression ratio has been studied.The test results show that whether the interface contact or non-contact does not affect the diffusion during the heating process.Under the vacuum condition,Cr and Ni evaporate from the stainless steel side and diffuse to the carbon steel side,and the diffusion distance of Cr is greater than that of Ni.During the rolling process,the metallurgical bonding is established at the composite interface.The difference in the concentration of Cr and Ni on both sides of the interface drove the diffusion of Cr and Ni to the carbon steel side,and the initial heating diffusion zone is rolled and thinned.The concentration difference of Cr on both sides of the bonding interface is small while that of Ni is large.After 2 times compression ratio hot rolling,only 20μm width Cr and 10μm width Ni depletion zones are formed on the stainless steel side.