The effect of molding and gating system design on hydrogen induced crack defects in steel castings
Keywords:
Hydrogen induced cracking, Steel casting, Gating system design, Molding design, Modelling and simulationAbstract
Hydrogen cracking occurs due to the build-up of gas pressure at inclusions, generally manganese sulfide inclusions. Cracking occurs in the thickest parts of a section, distance to diffuse out to surface is greater, and hydrogen is more likely to get trapped. Casting simulation technology is an most effective method to provide the predicted information on casting defects such as shrinkage, gas entrapment, and non-metallic inclusions. But it is not possible to detect hydrogen-induced defects in steel castings in today's flow and solidification simulation programs. In the study, various moulding and gating system designs have been designed for steel castings in industrial conditions and the effects of gating system design on hydrogen-induced crack defects have been investigated. The flow and solidification of the gating systems of the casting part were simulated by using Novacast flow and solidification program. The study clearly shows that gating system has revealed that it plays a significant role in preventing hydrogen-induced crack defects in steel castings.
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