CAJ | 학술논문

采用连续定向凝固的方法制备出了尺寸为400 mm×100 mm×20 mm、表面光亮、柱状晶沿板坯长度方向生长的纯铝板坯。对板坯表面裂纹种类进行了归类，对裂纹的形成因素进行了分析。实验结果表明：用连续定向凝固方法制备的纯铝板坯表面缺陷主要有板面上横裂纹和角部横裂纹两种，其长度从2 mm到4 mm不等，深度最大可达4 mm，且表面横裂纹的分布方式各异，有轴向、径向平行分布和局部横裂纹。工艺参数匹配、结晶器表面光洁度、初始冷却距离内导热能力的变化及引锭板的对中等因素是影响板坯表面质量的关键因素。
채용련속정향응고적방법제비출료척촌위400 mm×100 mm×20 mm、표면광량、주상정연판배장도방향생장적순려판배。대판배표면렬문충류진행료귀류，대렬문적형성인소진행료분석。실험결과표명：용련속정향응고방법제비적순려판배표면결함주요유판면상횡렬문화각부횡렬문량충，기장도종2 mm도4 mm불등，심도최대가체4 mm，차표면횡렬문적분포방식각이，유축향、경향평행분포화국부횡렬문。공예삼수필배、결정기표면광길도、초시냉각거리내도열능력적변화급인정판적대중등인소시영향판배표면질량적관건인소。
The pure aluminum slab in the size of 400 mm×100 mm×20 mm, shiny surface and columnar crystals growing along the direction of the slab length was prepared by the method of continuous unidirectional solidification. The types and formation factors of surface cracks on the slab were classified and analyzed respectively. The results are as follows.The surface defects of pure aluminum plate prepared by the method of continuous unidirectional solidification mainly include surface transverse cracks and corner transverse cracks. Its length ranges from 2 mm to 4 mm and depth is up to 4 mm. The distribution of the surface transverse cracks is different, including axial and radial parallel distribution and partial transverse cracks. The process parameters match, the surface finish of the crystallizer, the changing ability to conduct heat in the initial cooling distance and the centering of dummy plate are the key factors affecting slab surface quality.