Cast bounding of AC3A aluminum alloy and quench hardening steel insert by use of flux

摘要

To improve of the surface hardness on Al alloy castings, the cast bonding of quench hardening steel insertion at near the surface on Al alloy castings was carried out by method used flux. The flux consists mostly of potassium fluo-aluminate, and was coated on steel insertion. By preheating at 473 K for 3.6 ks for dehydration, commercial base flux was possible to use on cast bonding. The condition on cast bonding of Al alloy and steel insertion was improved remarkably by using flux. On this method, the cast bonding used molten Al alloy containing Mg over 0.2 mass % was difficult because Mg reacts with flux to form a compound higher melting temperature. The hardness of quench hardening carbon steel (SK3, S45C) insertion decreased by temper softening with cast bonding, but then, these influence on alloy tool steel (SKD61) insertion with resistance of temper softening were nothing.