Research on Microstructure and Properties of C18150/316L Diffusion Interface
C18150/316L clad plates were prepared by vacuum diffusion bonding technique and the bonding properties were tested by shear test at room temperature.The microstructure of the clad plate near the interface was observed by optical microscopy.The fracture morphology and the distribution of Cu,Fe,Cr and Ni near the interface were analyzed by scanning electron microscopy(SEM).The experimental results show that the microstructure near the C18150/316L interface is dense,a large number of Cu and Ni solid solutions are formed and there are no cracks,holes,impurities and other microstructure defects.The interfacial shear strength of the clad plate is about 228 MPa.The shear fracture occurs near the C18150 base metal and 10%-12%strain occurs before the fracture,indicating that the strength of the interface is higher than that of the C18150 base metal.At room temperature,200℃and 300℃,high purity helium gas with a pressure of 1 MPa is injected into the closed cavity structure for leak detection.The actual leakage rates are all 1.1×10-10 Pa·m3/s,indicating that the interface has good air tightness.It meets the relevant requirements of material leakage rate(less than 1.5×10-8 Pa·m3/s)for the shell manufacturing of nuclear fusion device.
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