Skripalenko Mikhail M, Rogachev Stanislav O, Romantsev Boris A, Bazhenov Viacheslav E, Skripalenko Mikhail N, Danilin Andrei V
Department of Metal Forming, National University of Science and Technology MISiS, Leninski Prospect, 4, 119049 Moscow, Russia.
Department of Physical Metallurgy and Physics of Strength, National University of Science and Technology MISiS, Leninski Prospect, 4, 119049 Moscow, Russia.
Materials (Basel). 2022 Mar 11;15(6):2093. doi: 10.3390/ma15062093.
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.
AA6060铸锭在一台带有导向鞋（曼内斯曼轧机类型）的二辊式斜轧穿孔机（MISIS - 130D）中穿孔。穿孔时使用了三种不同的顶头，即传统的整体顶头、带腔顶头和空心顶头。我们确定，与初始未穿孔的退火坯料（晶粒尺寸为100 - 400μm）相比，穿孔后晶粒尺寸减小了一个数量级，并且空心管坯的晶粒沿穿孔方向拉长。所生产的空心管坯硬度比初始坯料高30%。使用传统整体顶头穿孔后获得的硬度值最高。使用空心顶头穿孔后，空心管坯体积内的硬度分布最均匀。空心管坯横截面和纵截面的硬度测量表明，硬度从空心管坯的外表面到内表面逐渐降低。
