Impact Wear Properties And Wear Mechanism Of Zr-4 Alloy Tube And Inconel718

Zirconium alloy is light water reactor fuel rods cladding material. Fuel cladding will be affected by the complicated internal and external pressure in the work process. The pressure difference generated micro amplitude vibration in shell tube. Micro amplitude vibration problem is the nuclear reactor tube of one of the main factors. In this paper, through the simulation of impact wear test to reveal the damage mechanism of zirconium alloy, to provide some theoretical support for the damage and failure problem of wear caused by flow induced vibration impact, so this research has important engineering application value.The impact wear tests of Zr-4 alloy tubes against Inconel718 Nickel alloy plates were carried out on impact wear test machine JDTRI-50, which studied the nuclear fuel rod cladding Zr-4 alloy tube impact wear behavior and mechanism of damage. The test parameters were as follows:the impact medium of dry and water, the impact frequency of 10 Hz, the impact loads respectively of 10 N,20 N and 40 N, the impact times from 0.5× 105to 10×105. At the end of the experiment using OLYMPUS-BX60M, JSM-7001F scanning electron microscope, Contour GT optical profiler, electron spectrometer (EDX) on the morphologies of the worn surfaces of the micro analysis showed that:(1) As the impact load and times increased, the contact area and depth of Zr-4 alloy tube increased, the impact damage aggravated.(2) When the load was constant, with the increased of impact times, the change process of damage surface oxygen content experience rapid growth, growth and stable.(3) When the load and impact times was larger, with the increasing of impact times, the performance of the mechanism of impact wear mainly includes the successive emergence, mutual conversion and synergistic effect of plastic deformation, fatigue spalling and oxidation wear.(4) In the dry and water medium, the wear mechanism of the impact had significant differences. Under dry conditions, the performance of the mechanism of Zr-4 alloy tube impact wear mainly includes mutual conversion and synergistic effect of wear oxidation and fatigue spalling. In aqueous medium, the fatigue spalling and abrasive wear are the main damage mechanism of zirconium alloy cladding tube.