李鹏飞,范景莲,章曼,韩勇,孙志雨,吕永齐,田家敏.ZrC增强细晶钨材料的高温性能和高热负荷冲击性能研究[J].稀有金属材料与工程,2019,48(2):517~523.[Li Pengfei,Fan Jinglian,Zhang Man,Han Yong,Sun Zhiyu,Lv Yongqi,Tian Jiamin.High Temperature Properties and High Heat Flux Shock Behavior of Fine Grain Tungsten Reinforced by ZrC Particles[J].Rare Metal Materials and Engineering,2019,48(2):517~523.]
ZrC增强细晶钨材料的高温性能和高热负荷冲击性能研究
投稿时间:2018-02-25  修订日期:2018-04-10
中文关键词:  第二相粒子  高温强度  导热系数  高热负荷  裂纹扩展
基金项目::国家自然科学基金资助(项目号51474242和51404308) 和国家科技部重大专项(项目号2014GB115000))
中文摘要:
      采用常压氢气烧结制备了W-ZrC材料,研究了添加ZrC对材料室温和高温力学性能与组织的影响,并对高热负荷冲击下的损伤行为进行了研究。结果表明,添加ZrC有利于钨材料的致密化和晶粒细化,提高了烧结态钨材料的强韧性:其中W-3wt%ZrC相对密度和室温拉伸强度分别达到99.7%和472MPa,400℃至1000℃的拉伸强度在420MPa左右,应变由室温的3.4%增加至1000℃时的11%。高热负荷冲击结果表明高强度能提高材料抗高热负荷冲击能力,W-3wt%ZrC材料在200 MW/m2 (5 ms)以下的高热负荷冲击表面基本无裂纹,在300-400MW/m2时出现的主裂纹网格间距明显较W-0.7wt%ZrC小。随高热负荷冲击能量增加,裂纹大致沿纵向向基体内部逐渐扩展。裂纹扩展遇到第二相粒子时,部分穿过第二相粒子,部分终止于第二相粒子。裂纹穿过第二相粒子时,裂纹与第二相粒子发生了交互作用,裂纹扩展方向发生改变。
High Temperature Properties and High Heat Flux Shock Behavior of Fine Grain Tungsten Reinforced by ZrC Particles
英文关键词:Second phase particle  high temperature strength  Thermal conductivity  transient high-heat flux  crack propagation
英文摘要:
      W-ZrC materials were prepared by ordinary consolidation sintering. The effects of ZrC addition on the mechanical properties and microstructure of the materials at room temperature and high temperature were studied, and the damage behavior under high heat flux shock was studied. The results show that ZrC is beneficial to densification and grain refinement, and improve the strength and toughness of W materials. The relative density and tensile strength of W-3wt%ZrC can reach 99.7% and 472MPa. The relative density and room temperature tensile strength of W-3wt%ZrC were 99.7% and 472MPa, respectively, and the tensile strength at 400 to 1000 C did not decrease at 420MPa, but the strain increased from 3.4% at room temperature to 11% at 1000 C. High heat flux shock show that high strength can improve the impact resistance of materials against high heat load. The surface of W-3wt%ZrC material has no cracks load under high heat flux shock of 200 MW/m2 (5 ms). The main crack spacing of W-3ZrC is smaller than W-0.7wt%ZrC at 300-400MW/m2. With the increase of the high heat load energy, the cracks gradually expand along the longitudinal direction. Microstructure shows that ZrC can consume the crack propagation energy and hinder crack propagation.
作者单位E-mail
李鹏飞 中南大学 粉末冶金国家重点实验室 lipf166@163.com 
范景莲 中南大学 粉末冶金国家重点实验室  
章曼 中南大学 粉末冶金国家重点实验室  
韩勇 中南大学 粉末冶金国家重点实验室  
孙志雨 中南大学 粉末冶金国家重点实验室  
吕永齐 中南大学 粉末冶金国家重点实验室  
田家敏 中南大学 粉末冶金国家重点实验室  
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