Enhancement of the Quality of the Shell-Core Bond Interface in Duplex Work Rolls Manufactured by Centrifugal Casting Used in Hot Strip Mills
Enhancement of the Quality of the Shell-Core Bond Interface in Duplex Work Rolls Manufactured by Centrifugal Casting Used in Hot Strip Mills
复制标题
DOI：
10.3390/ma12081304
复制
发表时间：
2019-04
期刊：
影响因子：
3.4
通讯作者：
Alberto Cofiño-Villar;Florentino Alvarez-Antolin;J. Asensio-Lozano
中科院分区：
文献类型：
--
作者：
Alberto Cofiño-Villar;Florentino Alvarez-Antolin;J. Asensio-Lozano
为了确保在热轧带米尔斯精轧机组中使用的工作辊的壳和芯之间形成无缺陷的良好的壳-芯结合界面，必须实现该界面的完全熔合，避免两种组分的过度混合和硬的、易碎的微结构的形成。外壳由白色铸铁制成，并与Ni和Cr合金化，芯部由珠光体基体中的灰铸铁球状石墨制成。因此，建议用0.6 kg/T SiCaMn对壳进行复烧，因为这会促进碳化物网络的不连续性，并导致结合界面的冲击韧性增加。此外，应避免用FeSi-La对壳进行孕育，因为这种孕育剂会导致石墨计数增加，促进其在结合边缘处具有层状形态，从而降低该界面的冲击韧性。已经发现，向壳中添加Mg会在与结合界面相邻的区域中产生硬度的增加。
To ensure the formation of a sound shell-core bond interface free of defects between the shell and the core in work rolls used in the finishing stands of hot strip mills, a complete fusion of this interface must be achieved, avoiding excessive mixing of the two components and the formation of hard, fragile microstructures. The shell is made of white cast iron, alloyed with Ni and Cr, and the core is manufactured of grey cast iron spheroidal graphite in a pearlitic matrix. It is thus advisable to inoculate the shell with 0.6 kg/T SiCaMn, as this promotes discontinuity in the carbide network and leads to an increase in the impact toughness of the bond interface. Furthermore, inoculation of the shell with FeSi-La should be avoided, as this inoculant leads to an increase in graphite counts, promoting it with a lamellar morphology at the edge of the bond and hence reducing the impact toughness in this interface. Addition of Mg to the shell has been found to produce an increase in hardness in the regions adjacent to the bond interface.