真空热轧Q345B碳钢-304不锈钢复合板界面Cr、Ni扩散行为研究

研究了 60 mm Q345B碳钢/10 mm 304不锈钢复合板坯在1 200℃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...

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

The diffusion behavior of Cr and Ni in the bonding interface of 60 nun Q345B carbon steel/10 mm 304 stainless steel clad plate being heated at 1 200 °C 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 tlie 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.