Mingyue Sun, Bin Xu, Bijun Xie, Dianzhong Li, Yiyi Li. Leading manufacture of the large-scale weldless stainless steel forging ring: Innovative approach by the multilayer hot-compression bonding technology[J]. J. Mater. Sci. Technol., 2021, 71: 84-86.
Fig. 1. A. Manufacturing process of the weldless stainless steel forging ring by the multilayer hot-compression bonding method. First, the surfaces of the 316 stainless steel casting billets are cleaned, stacked in order and then vacuum-packaged by electron beam welder. Then, the whole package is hot compression bonded with interface healed completely and molded into the initial billet shape for secondary hot-compression bonding. Next, two initial billets are vacuum-packaged again by electron beam welder and then hot-compression bonded into the large billet required for the ring rolling. Subsequently, punching, broaching and rolling are carried out to finally obtain an integral support ring (φ = 15.6 m). B. Evolution of interfacial oxides with different holding times. Particles indicated by blue arrows at the original bonding interface are interfacial oxides, and particles indicated by white arrows around both sides of the interface are particle precipitates [5]. C. Energy dispersive X-ray spectroscopy (EDS) profiles of the particle precipitates in the particle precipitation zone (PPZ) with different holding times [5].
Fig. 1. A. Manufacturing process of the weldless stainless steel forging ring by the multilayer hot-compression bonding method. First, the surfaces of the 316 stainless steel casting billets are cleaned, stacked in order and then vacuum-packaged by electron beam welder. Then, the whole package is hot compression bonded with interface healed completely and molded into the initial billet shape for secondary hot-compression bonding. Next, two initial billets are vacuum-packaged again by electron beam welder and then hot-compression bonded into the large billet required for the ring rolling. Subsequently, punching, broaching and rolling are carried out to finally obtain an integral support ring (φ = 15.6 m). B. Evolution of interfacial oxides with different holding times. Particles indicated by blue arrows at the original bonding interface are interfacial oxides, and particles indicated by white arrows around both sides of the interface are particle precipitates [5]. C. Energy dispersive X-ray spectroscopy (EDS) profiles of the particle precipitates in the particle precipitation zone (PPZ) with different holding times [5].