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鑄造应力問題是造成鑄件热裂及冷裂的主要原因之一。近年來随着球墨鑄铁生產技術的不断改進,球墨鑄铁已逐漸应用於較大鑄件的生產。对於球墨鑄铁鑄造性能的研究,特别是有關引起鑄造应力的理論問題,目前尚研究得較少。加强对这一問題的研究,是可以進一步了解球墨鑄铁鑄造性能上的特點,从而在实际生產上加以防止及改進。 鑄造应力的生成,主要是由於金属凝固后所發生的体積变化而引起。鑄造上的热裂及冷裂現象卽由於在此应力作用下引起变形,当超过鑄件該部分的臨界强度時卽造成開裂。金属凝固後在固体階段
Casting stress problem is caused by casting hot cracking and cold cracking one of the main reasons. In recent years, with the continuous improvement of ductile iron production technology, ductile iron has been gradually applied to the production of larger castings. Research on the casting properties of ductile iron, especially on the theoretical problems that cause the casting stress, has not been studied yet. To strengthen the research on this issue is to further understand the casting ductile iron castings on the characteristics of the actual production to be prevented and improved. Casting stress generation, mainly due to the metal after the change in volume caused by solidification. Casting hot and cold cracking phenomenon 卽 due to deformation caused by this stress, when the critical strength of the castings in excess of 卽 caused cracking. After solidification of the metal in the solid stage