Abstract
Ductile cast iron has typical characteristics of mushy solidification and ductile expansion. The feeding effect of ductile cast iron was studied by means of numerical simulation and pouring tests. The prototypes used for experiments were designed into three types: riser without neck; riser with narrow neck; and riser-less. The corresponding molds were made of coated sand. The pouring temperature was set to 1350 °C, 1300 °C, and 1250 °C, separately. Results showed that the feeding effect could be controlled by the riser structure and the pouring temperature comprehensively. If the pouring temperature was higher than a certain value, the casting should be fed by a riser, and the riser structure would play an important role. However, it was very hard to design a riser exactly, and the unsuitable riser would cause macro porosity or surface sink. When the pouring temperature decreased to a certain value, there was no macro porosity or surface sink. It could provide a potential method to simplify the feeding process and improve the casting quality.
Highlights
In the casting production, the molten alloy would reduce its volume during the cooling and the solidification process
When the pouring temperature was higher than a certain value (1350 ◦ C in this experiment), the liquid contraction of the casting was large, which needed a lot of feeding alloy from the riser
The ductile cast iron casting normally needs to be fed through the riser when the pouring temperature is high
Summary
The molten alloy would reduce its volume during the cooling and the solidification process. If the casting could not be fed sufficiently, internal porosity and surface sink defects would appear, especially for the alloy that has a mushy zone during the solidification process. It is much easier to manufacture complex-shaped casting than steel but with similar properties. It has been widely used in automobile, fire protection, electric power, etc. Due to the different production conditions, practical experience, and theoretical basis, the feeding process applied for the ductile cast-iron castings is quite different. Some people think that the mushy solidification and graphitization expansion of ductile cast iron should be fully considered
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
