microfilm

s:The cracks in the captioned strip in cold rolling are tested and preliminarily analyzed with the results showing that the fine cracks in the lower surface of the cast strip leads to the cracks in the strip during coiling ard rolling due to repeated action of drawing stresses and that the internal cracks like earthworms have gradually evolved from microporosity.

对水平连铸QSn6 5 0 1带坯在冷轧过程中出现的开裂现象进行了检验和初步分析 ,结果表明 :带坯下表面出现微小裂纹 ,在卷取、轧制的反复拉应力作用下导致表面开裂 ;内部线状、蚯蚓状裂纹是由显微缩松逐步演变而来。

The microporosity on tensile break of cast iron is observed by SEM.

用扫描电镜(SEM)研究了铸铁拉伸断口中的显微缩松,讨论了缩松缺陷的形成特点及其对断裂的影