Abstract

Stainless steel clad plates have been largely used in engineering applications because of their excellent mechanical properties. Thus, there are many kinds of composite processes to prepare stainless steel clad plates. In general, the temperature is one of the most important parameters in the bonding processes, which is studied as a constant value. In this work, a novel bonding process using cyclic phase transformation heat treatment was subjected to manufacture stainless steel clad plates. The results reveal that stainless steel clad plates are successfully bonded. The joining process of the composite interface can be divided into three stages: the appearance of long interface voids, the shrinkage of long interface voids, and the formation of the continuous austenite phase. Microstructural analyses suggest that recrystallization and element diffusion occur during the bonding. Compared with isothermal heat treatment, it is obvious that this process can avoid ferrite grain coarsening. Moreover, the joining efficiency can be improved significantly by accelerating the transformation of the ferrite to the austenite at the interface. The shear test demonstrates that the shear strength of stainless steel clad plates after cyclic phase transformation heat treatment is larger than that of isothermal heat treatment in the same bonding time. The dimples on the shear fracture surface also dramatically increase.

摘要

不锈钢复合板由于其优异的机械性能已广泛用于工程应用。因此，制备不锈钢复合板的复合工艺有很多种。一般来说，温度是键合过程中最重要的参数之一，它被研究为一个常数值。在这项工作中，采用循环相变热处理的新型粘合工艺制造不锈钢复合板。结果表明，不锈钢复合板粘合成功。复合界面的连接过程可分为三个阶段：长界面空隙的出现、长界面空隙的收缩和连续奥氏体相的形成。微观结构分析表明，在结合过程中发生了再结晶和元素扩散。与等温热处理相比，显然这种工艺可以避免铁素体晶粒粗化。此外，通过加速界面处铁素体向奥氏体的转变，可以显着提高接合效率。剪切试验表明，不锈钢复合板经过循环相变热处理后的剪切强度大于等温热处理在相同粘合时间下的剪切强度。剪切断口表面的凹坑也急剧增加。通过加速界面处铁素体向奥氏体的转变，可以显着提高接合效率。剪切试验表明，不锈钢复合板经过循环相变热处理后的剪切强度大于等温热处理在相同粘合时间下的剪切强度。剪切断口表面的凹坑也急剧增加。通过加速界面处铁素体向奥氏体的转变，可以显着提高接合效率。剪切试验表明，不锈钢复合板经过循环相变热处理后的剪切强度大于等温热处理在相同粘合时间下的剪切强度。剪切断口表面的凹坑也急剧增加。