一种管状试样动态液态铅铋合金回路腐蚀疲劳试验装置及使用方法

本发明涉及疲劳试验领域，具体是一种管状试样动态液态铅铋合金回路腐蚀疲劳试验装置及使用方法。管状试样安装于上下底座之间，管状试样下端依次与下底座内通孔、液态铅铋合金进入管相连通，管状试样上端依次与上底座内通孔、液态铅铋合金流出管相连通。管状试样外贴热电偶实时监测与控制液态铅铋温度，外表面安装引伸计测量应变。液态铅铋经储存釜由电磁泵驱动，进入反应釜加热控氧，通过流量计测流速后流入管状试样，再回流至储存釜形成回路。回路管道外壁配备铠装电伴热与保温棉，确保温控。本发明实现高温液态铅铋温度、溶解氧与流速的精确控制，支持动态应变控制疲劳试验，评价材料在流动高温液态铅铋环境下的腐蚀疲劳性能。

This invention relates to the field of fatigue testing, and specifically provides a dynamic liquid lead-bismuth alloy loop corrosion fatigue testing device for tubular specimens and its operating method. The tubular specimen is installed between the upper and lower bases, with its lower end sequentially connected to the through-hole inside the lower base and the liquid lead-bismuth alloy inlet pipe, and its upper end sequentially connected to the through-hole inside the upper base and the liquid lead-bismuth alloy outlet pipe. Thermocouples are attached to the exterior of the tubular specimen to monitor and control the temperature of the liquid lead-bismuth alloy in real time, while an extensometer is mounted on the outer surface to measure strain. The liquid lead-bismuth alloy is driven by an electromagnetic pump from the storage tank, enters the reaction vessel for heating and oxygen content control, has its flow rate measured by a flow meter before flowing into the tubular specimen, and then returns to the storage tank to form a loop. The outer walls of the loop pipelines are equipped with armored electric trace heating and thermal insulation cotton to ensure accurate temperature control. This invention achieves precise control over the temperature, dissolved oxygen content and flow rate of high-temperature liquid lead-bismuth alloy, supports dynamic strain-controlled fatigue tests, and allows for the evaluation of the corrosion fatigue performance of materials in flowing high-temperature liquid lead-bismuth alloy environments.