(東北大學(xué) 材料電磁過(guò)程研究教育部重點(diǎn)實(shí)驗(yàn)室, 沈陽(yáng) 110004)
摘 要: 研究H90-鋼-H90反向凝固復(fù)合過(guò)程中復(fù)合層厚度的變化規(guī)律以及復(fù)合帶的組織和性能，探討界面結(jié)合機(jī)理。結(jié)果表明：隨著浸漬時(shí)間的增加，復(fù)合層的厚度變化經(jīng)歷了凝固生長(zhǎng)、平衡相持和回熔3個(gè)階段，鋼帶的預(yù)熱溫度越低，獲得的最大復(fù)合層厚度越厚；H90復(fù)合層的組織為等軸晶粒，復(fù)合界面處Cu和Fe發(fā)生了擴(kuò)散，而Zn未發(fā)生明顯擴(kuò)散，擴(kuò)散層較薄，約為4 μm；復(fù)合帶的界面結(jié)合牢固；不同復(fù)合層厚度的復(fù)合帶，其力學(xué)性能略有差異，但均達(dá)到GB5213—85所規(guī)定的F級(jí)深沖鋼板的力學(xué)性能要求。
關(guān)鍵字: 反向凝固；復(fù)合帶；復(fù)合層；界面；結(jié)合強(qiáng)度
by inversion solidification
（The Key Laboratory of Electromagnetic Processing of Materials,
Ministry of Education, Northeastern University,
Shenyang 110004, China）
Abstract:The variation law of cladding thickness, the structures and properties of the clad strip produced by inversion solidification were studied. The interface bonding mechanism was approached. The results show that the thickness of H90 cladding goes sequentially through solidification growth stage, holding stage and remelting stage with the increase of immersion time. The higher the preheating temperature of steel coil, the thicker the maximum cladding thickness obtained. The microstructure of H90 clad layer is equiaxed grains. There is inter-diffusion of Cu and Fe near the interface but there is not obvious diffusion of Zn. The diffusion layer is very thin and about 4 μm. The interface is firmly bonded, and the mechanical properties of the as-clad coils can reach the requirements of GB5213-85 for F-grade deep-drawing steel plate though there is slight difference of mechanical properties among the clad strips with different cladding thickness.
Key words: inversion solidification; clad coil; clad layer; interface; bond strength
