Which consequence results when aluminum casting chills are incorrectly placed?

💡 Explanation

Improper chill placement alters the solidification rate unevenly because localized rapid cooling introduces significant thermal gradients creating increased gas solubility, causing porosity formation rather than uniform or suppressed microstructures. Therefore, porosity near thick sections increases.

• Which outcome results when an engine's fuel injector nozzle gets coked due to excessive heat and unburnt fuel?
• Which outcome occurs when thermal strain exceeds valve clearance?
• Which instability occurs when thrust reversers are deployed late during landing?
• Which signal attenuation results when atmospheric temperature inversion refracts a microwave antenna signal intended beyond visual range?
• Which consequence results when welding thick high-carbon steel plates?
• Which outcome occurs when lateral torsional buckling (LTB) exceeds the allowable limit in a steel I-beam under a bending load?