Effects of cooling rate on impact properties and microstructure of gray cast iron ASTM A4

Abstract

In this study, gray cast iron ASTM A48 was subjected (1) to testing for effects of cooling rate on its impacts properties; and (2) to assessing the relationship between microstructure and properties. The cooling rate was varied by testing the four cooling methods (1) As-cast; (2) Furnace-cooled; (3) Air-cooled; and 4) Green sand-cooled. It was found that the impacted properties are governed by flat fractures that meet minimum energy density criteria. Thus, we established a correlation between the microstructure and impact properties of GI ASTM A48 for conformance analysis to develop a predictive relationship. These include test specimen size and energy consumption patterns. As a result, the impact properties of GI ASTM A48 are finally predictable. This results in good efficiency and can be applied to heat treatments of some new materials.

Keywords

• impact behavior
• systematic relationship
• integrity of cooling rate
• gray cast iron astm a48