Single Crystal Superalloy (?) C36 Electron Beam Zone Melting Directional Solidification

In this article , ЖC36 single crystal superalloy is gotten by eletron beam(EB) zone melting facility at the basis of the former' research work., the aim is to supply technique supportment for the application of EB.The temperature distribution of a floating zone melting in electron beam is calculated on the basis of a heat flow model; ЖC36 single crystal superalloy is remelted in ESZ 1.5/5 EB surface. Under the condition of power suddenly becoming zero , the diverse microstructure of ЖC36 single crystal superalloy is gotten. During the all experiments, the power is basicly invariable, but the zone melting rate is from 0.1mm/min to 6.0mm/min.The microstructures of ЖC36 single crystal superalloy are analyzed and detected with optical microscope , SENL EPA and XRD. The main conclusions are summarized as follows:(l)The temperature distribution of a floating zone melting in electron beam is calculated on the basis of a heat flow model.I If the length of melted zone is thought invariable for a given kind of alloy, the temperature gradient increases with the rising of the EB power and zone melting rate.II For a certain alloy, if the zone melting is smooth, the temperature gradient can be considered as constant.III The results demonstrate that the calculated temperature gradient is similar with the value evaluated by constituent supercooling theory. The temperature gradient of the ESZ1.5/5 EB apparatus is about 350K/cm for the ЖC36 single crystal superalloy.(2) If the zone melting power is basic unchangeable, the interface morphology of ЖC36 single crystal superalloy evolves from plan to cell and then to dendrite with the melting rate increasing. The gamma' in the dendrite trucks aresmaller and more regular than those in the inter-dendrite area. Al, Ti, Mo are enriched elements in the inter-dendrite area, but W> Co are rich in the dendrite trunks. With the increasing of the melting rate, microsegregation increases and then decreases; Meanwhile, the size of gamma/gamma' eutectics decreases.(3) The deviation of [100] orientation from the axial direction is within 10?for single crystals with various solidified morphologies.It can be concluded that the ЖC36 single crystal superalloy can be gotten with the EB apparatus with high temperature gradient.