What is a common cause of porosity in casting processes?

Porosity in casting processes is primarily associated with deviations in processing parameters. When the conditions under which the metal is poured and solidifies are not optimal, various defects, including porosity, can occur. Factors such as temperature control, pouring speed, and the compatibility of molds can significantly influence the formation of gas bubbles or voids within the material.

For instance, if the metal is introduced into the mold too quickly, it can trap air and prevent it from escaping, leading to porous sections. Similarly, if the metal solidifies too slowly, gas may have time to dissolve, which also results in the formation of pores. Hence, maintaining accurate and controlled processing parameters is crucial in minimizing porosity and ensuring the integrity of cast products.

Other options, while related to casting quality, do not directly address the mechanisms leading to porosity as specifically as the influence of processing parameters does.