Relation between Cracking of Intermetallic Coating Layer of Galvannealed Steel Sheet and Grain Boundary of Substrate Steel
Relation between Cracking of Intermetallic Coating Layer of Galvannealed Steel Sheet and Grain Boundary of Substrate Steel
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镀锌钢板金属间化合物镀层裂纹与基体钢晶界的关系
DOI：
10.2355/tetsutohagane1955.91.3_342
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发表时间：
2005
影响因子：
0.3
通讯作者：
H. Okuda
中科院分区：
文献类型：
--
作者：
Toyomitsu Nakamura;Shojiro Ochiai;S. Iwamoto;Daiki Adachi;H. Okuda
研究了基体钢的多重裂纹行为及其与晶界的关系。用扫描电镜观察了试样在规定应变下的裂纹间距及其分布。根据电子背散射图估计了衬底晶粒的晶体取向。通过图像处理软件将涂层裂纹图像与基体钢晶界图像相结合，判断涂层裂纹是否从基体晶界以上开始。主要研究结果总结如下：(1)涂层的开裂开始于基体晶界以上的区域。(2)在衬底晶界以上产生的裂纹横向扩展；也就是说，它们传播到没有基底晶界存在的区域。(3)涂层开裂发生在小角度晶界以上，或发生在施密德系数较大的完整晶界以上。(4)涂层在多次开裂过程中，裂纹间距分布与晶界间距分布保持相似性。
Synopsis Multiple cracking behavior and its relation to the grain boundary of the substrate steel were investigated. The crack spacing and its distribution of the specimens strained to prescribed strains were observed with a scanning electron microscope. The crystallographic orientation of the substrate grains was estimated from the electron back scattering pattern. The images of the cracks of the coating layer and grain boundaries of the substrate steel were combined together with image processing software to know whether the cracking of coating layer initiates above the substrate grain boundaries or not. The main results are summarized as follows. ( I ) The cracking of the coating layer initiates in the regions just above the substrate grain boundaries. (2) The cracks that initiate above the substrate grain boundaries propagate transversely; namely they propagate into the region, below which no substrate grain boundary exists. (3) It was suggested the cracking of the coating layer initiates above the small angle grain boundaries or above the grain boundaries intact to the grains with large Schmid factors. (4) In the multiple cracking process of the coating layer, the similarity of the crack spacing distribution to the grain boundary spacing distribution is kept.