1 School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China 2 Shanxi Jinrui High Pressure Ring Co., Ltd., Xinzhou 035400, Shanxi, China 3 Shanxi Shida Forging Co., Ltd., Xinzhou 035400, Shanxi, China
Abstract: Compared with the single metal ring, the bimetal ring has great advantages. It has two different metal with different properties to meet the different requirements for the inner and outer layers of the ring at the same time. Aiming at the problems of time-consuming, labor-intensive and poor bonding effect in the current manufacture of bimetallic rings, the authors proposes and studies a short-process manufacturing technology for bimetallic composite rings. In this process, two metals are joined together by centrifugal casting to form an annular billet, which is then hot rolled into a bimetallic ring. The method has the advantages of high production efficiency, energy saving, and good bonding layer. Based on the centrifugal casting bimetallic ring billets (inner layer Q345, outer layer 40Cr), ring rolling experiments were carried out at different initial rolling temperatures (1 200 ℃, 1 150 ℃, 1 050 ℃) and different rolling ratios (2.3, 2.0, 1.5). Metallographic and tensile experiments were performed on these rings. With the increase of rolling ratio, the grain size of the ring first became smaller and then larger, and the tensile strength first increased and then decreased. With the increase of rolling ratio, the grain size of the ring first became smaller and then larger, and the tensile strength first increased and then decreased. The bonding layer is a transition region with no obvious boundaries and its grains are larger than those of inner and outer layers. With the decrease of initial rolling temperature, the tensile strength increases first and then decreases, and the plasticity increases. All the ovality of rolled rings are less than 0.02, and no crack is detected by ultrasonic. When the initial rolling temperature is 1 050 ℃ and the rolling ratio is 2.3, the comprehensive performance of the ring is the best. The bimetallic ring of centrifugal casting has good shape, no crack defect, and its microstructure and mechanical properties have been improved after rolling. The casting and rolling compound forming of bimetallic ring is realized successfully.
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2023, Vol. 37 
