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本文叙述了球铁薄壁小件末曾发现的,大断面球铁的特异组织及其对策。发电机和泵类大型机械用铸件,有重达数十吨,壁厚超过100mm的大型铸件,且质量要求高,不仅检验试块部分,而且要保证冒口下的铸件高质量或按样品提供的要求。这种大断面铸件的生产,从原材料开始就要更严格的管理更细心的操作。球铁的特异组织之一有微细石墨(图1)。它类似于共晶石墨,但石墨形状和片状不同,又远比蠕墨铸件中的蠕虫状石墨细小。
This paper describes the special microstructure and countermeasures of large-area ductile iron found in the last part of thin-walled ductile iron. Generators and pumps Large mechanical castings, weighing tens of tons, wall thickness greater than 100mm large castings, and the high quality requirements, not only the test block, but also to ensure that casting under the riser of high quality or provided by the sample Request. The production of such large cross-section castings, from the beginning of the raw material to be more stringent management of more careful operation. One of the specific structures of ductile iron is fine graphite (Figure 1). It is similar to eutectic graphite, but different in shape and flake of graphite, and far smaller than vermicular graphite in vermicular graphite castings.