高热负荷作用下钨的热疲劳损伤研究  

Thermal Fatigue Damage of Tungsten Under High Heat Load

作　　者：马栋[1] 王波[1] 王亮[1] 汤云晖[1] 张丽霞[2] 宋雪梅[1] Ma Dong 1, Wang Bo1, Wang Liang1, Tang Yunhui1, Zhang Lixia2, Song Xuemei 1(1. Beijing University of Technology, Beijing 100124, China） （2. Research and Test Center, Hangtiankegong Corporation, Beijing 100854, China)

机构地区：[1]北京工业大学,北京100124 [2]航天科工防御技术研究试验中心,北京100854

出　　处：《稀有金属材料与工程》2018年第3期867-870,共4页Rare Metal Materials and Engineering

基　　金：ITER专项项目(2013GB109003);国家自然科学基金(51571003)

摘　　要：利用实验室自主搭建的电子束热疲劳测试系统,研究了再结晶态钨在功率为141.5 MW/m^2,不同循环次数下热疲劳损伤性能的变化规律。采用扫描电子显微镜(SEM)观测了损伤后表面形貌的变化,采用原子力显微镜(AFM)观测了损伤表面的三维形貌的变化,同时也测出损伤表面粗糙度。采用显微硬度计测试了热疲劳损伤后晶粒表面显微硬度的变化。结果表明:随循环次数的增加,钨热疲劳损伤加剧,当循环1000次时,钨表面已经有熔融的形貌出现;测得损伤表面的粗糙度随循环次数呈近似线性变化;损伤之后的显微硬度先升高后降低,主要是由于存在疲劳硬化的现象。The thermal fatigue damage of recrystallization tungsten with different cycle times was studied at power of 141.5 MW/m^2 by electron beam thermal fatigue test system which was built independently in the laboratory. Changes in surface topography after thermal shock in many cycles were observed by scanning electron microscopy（SEM）. Changes of three-dimensional morphology and surface roughness were detected by Atomic force microscope（AFM） and the surface hardness was tested after thermal fatigue. The results show that with the increase of the cyclic number, thermal fatigue damage intensifies. The surface of tungsten starts to be molten at 1000 cycles. The surface roughness changes linearly with the cycle number; it is increased firstly and then decreased because of the fatigue hardening.

关 键 词：再结晶态钨 热疲劳损伤 粗糙度 显微硬度 

分 类 号：TG146.411[一般工业技术—材料科学与工程]