Investigation on effect of carbon equivalent and inoculation on the solidification and shrinkage tendency of ductile cast iron using thermal analysis

IF 1.7 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Multidiscipline Modeling in Materials and Structures Pub Date : 2023-10-30 DOI:10.1108/mmms-04-2023-0143
Bahubali Babanrao Sangame, Y. Prasannatha Reddy
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Abstract

Purpose The foundry industry incurs additional costs as a result of defective castings. Shrinkage defects are a frequent problem in ductile iron castings. It is still essential to understand how shrinkage porosity varies in size when the ductile iron composition changes. This information can be used to produce high-quality cast parts and determine the best processing conditions. The objective of this research paper is to examine the effect of carbon equivalent and inoculation on the morphology of the shrinkage defect using thermal analysis. Design/methodology/approach This study focuses on certain thermal analysis parameters, such as the angle of the first derivative curve at the solidus temperature, recalescence and its relationships to graphite nucleation and shrinkage tendency. The results of thermal analysis in terms of the cooling curve and its derivative parameters, and thorough characterizations of the shrinkage observed in cup castings produced with various melt compositions and inoculation are presented in the current study. Findings The proportion of caved surfaces and macro shrinkage porosity defects has been reduced as the carbon equivalent of melt increases from hypoeutectic to a hypereutectic composition. The composition that is slightly hypereutectic has the lowest shrinkage propensity. Although inoculation reduces shrinkage, the importance of this parameter differs depending on the carbon equivalent. Originality/value The percentage of macro shrinkage porosity and the angle that the cooling rate curve forms are strongly correlated. It is found that the macro shrinkage size decreases as the angle of the first derivative curve at the solidus temperature is reduced. Further, lower macroporosity is produced by a metal that has a higher nodule count in association with a greater cooling rate toward the end of the solidification process.
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用热分析法研究了碳当量和孕育对球墨铸铁凝固和收缩倾向的影响
铸造业由于铸件缺陷而产生额外的成本。收缩缺陷是球墨铸铁件中常见的问题。当球墨铸铁的成分发生变化时,了解缩孔率是如何变化的仍然是必要的。这些信息可以用来生产高质量的铸件,并确定最佳的加工条件。本文的目的是利用热分析方法研究碳当量和接种对收缩缺陷形貌的影响。设计/方法/方法本研究重点研究了某些热分析参数,如固相温度下一阶导数曲线的角度、再发光及其与石墨成核和收缩趋势的关系。本文介绍了用冷却曲线及其衍生参数进行热分析的结果,以及在不同熔体成分和孕育下生产的杯形铸件所观察到的收缩率的全面表征。随着熔体碳当量由亚共晶向过共晶的增加,溶洞表面和宏观缩孔缺陷的比例有所减少。稍微过共晶的成分具有最低的收缩倾向。虽然接种减少收缩,这一参数的重要性是不同的取决于碳当量。宏观缩孔率与冷却速率曲线形成的角度密切相关。在固相温度下,随着一阶导数曲线角度的减小,宏观收缩尺寸减小。此外,较低的宏观孔隙率是由具有较高的结核数的金属与在凝固过程结束时较大的冷却速率相关联而产生的。
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来源期刊
CiteScore
3.70
自引率
5.00%
发文量
60
期刊介绍: Multidiscipline Modeling in Materials and Structures is published by Emerald Group Publishing Limited from 2010
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