Abstract
AA6060 ingots were pierced in a two-high screw rolling mill (MISIS-130D) with guiding shoes (Mannesmann mill type). Three different plugs, i.e., a conventional entire plug, a plug with a cavity, and a hollow plug, were used for piercing. We established that the grain size decreases after piercing, by order of magnitude, compared to the initial non-pierced annealed bill, with a grain size of 100–400 μm, and the hollow shell grains are elongated along the piercing direction. The produced hollow shells had 30% higher hardness than the initial billet. The highest hardness values were obtained after piercing the conventional entire plug. The most uniform hardness distribution through the hollow shell’s volume was obtained after piercing the hollow plug. The cross and longitudinal section hardness measurements demonstrate that the hardness decreases from the outer surface to the inner surface of the hollow shells.
Highlights
One of the ways of producing hollow shells is piercing in a two-high screw rolling mill
The microstructure of the hollow shells obtained by entire plug piercing and hollow plug piercing is similar, and it differs from the hollow shell microstructure produced by the plug with cavity piercing
The microstructure of the hollow shells obtained by entire plug piercing and hollow plug piercing is similar, and it differs from the hollow shell mi‐
Summary
One of the ways of producing hollow shells is piercing in a two-high screw rolling mill. Several categories of investigation, depending on the research direction and estimated parameters, can be detected among publications concerning piercing in two-high screw rolling mills. One such category is the estimation of the loads and energy parameters of the screw piercing process [9,12–14], including the loads on the plug and rolls. Regarding the review of two-high screw rolling research publications, it is worth noting articles connected with hollow shell microstructure formation under different deformation regimes [20–24]. Because it allows recommendations on choosing a plug for piercing in two-high screw rolling mills to be designed, to obtain the most uniform hollow shell property distribution
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