Influence of Melt Hydrogenation with Other Types of Processing on Formation and Quality of Castings from Aluminum Alloys
Processy litʹâ, 2019, Tom 135, №3, p.3-13
Keywords:
aluminum alloys, casting, melt, hydrogenation, modification, refining, gas shrinkage defectsAbstract
Received 02.04.2019
УДК 669.715:669.788
It has been experimentally proved that hydrogenation of liquid aluminum alloys before pouring into molds can reduce and even eliminate the defect castings in hot brittleness, lattices, leaks of metal-consuming units. However, this usually does not draw attention to the fact that the same melt in parallel can be modified, including the introduction of chips, or refining. Such a combination may have an unexpected effect on the quality of the casting. The work shows that combining the hydrogenation with the introduction of chips leads to a sharp increase and uneven distribution of gas porosity, which is undesirable. Flux modification due to the reduction of Al2O3 particles in the melt accelerates the diffusion removal of hydrogen, therefore, the melt should be cast soon after hydrogenation. Combining with strontium modifying at optimum holding can significantly increase strength and ductility. A method has been developed for determining the length of pores, which helps to understand the mechanisms of their formation and improve the tightness of cast products.
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