Ki-Baek Roh, Myeong-Geon Lee, Kyung-Min Kim, Gon-Ho Kim
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引用次数: 0
摘要
实验研究了钨在瞬态热负荷条件下的微裂纹扩展和晶粒生长,观察了应力增强对大裂纹发展的影响。在基础温度为 1150 ℃、频率为 30 Hz、热通量为 0.1 GWm-2、持续时间为 2 ms 的短时间温度变化诱发了钨表面的疲劳断裂,导致微裂纹的形成。由于有效的空间温度变化仅限于几微米,因此微裂纹也出现在相当的深度。微裂纹产生后,根据晶粒生长模型,测量模型的相关常数,测量并计算出晶粒生长随时间的传播深度。在晶粒生长层内,微裂纹顶端退化的材料特性导致应力加剧,最终发展成毫米量级的大裂纹。该研究表明,瞬态热负荷导致的钨表层下微结构变化有可能发展成延伸至更深体积区域的宏观裂纹。
Macrocrack propagation with grain growth on transient heat loaded tungsten
The propagation of microcrack and grain growth in tungsten occurred at condition of transient heat loads was investigated experimentally, observing the effect on macrocrack development induced by stress intensification in time order. The temperature variation in short time, with frequency 30 Hz, heat flux 0.1 GWm−2, duration 2 ms at base temperature 1150 °C, induces fatigue fracture on the surface of tungsten, resulting in the formation of microcrack. Since the effective spatial temperature variation is limited to a few micron, microcrack is also occurred at the comparable depth. Following the initiation of microcrack, the grain growth propagation depth over time is measured and calculated based on the grain growth model with measuring the associated constants of the model. Within the grain growth layer, the degraded material properties at the microcrack tip lead to stress intensification which ultimately develop into macrocrack with order of millimeters. The study investigates that the subsurface microstructural changes in tungsten, caused by transient heat loads, have the potential to develop into macrocrack that extend into the deeper bulk area.
期刊介绍:
The Journal of the Korean Physical Society (JKPS) covers all fields of physics spanning from statistical physics and condensed matter physics to particle physics. The manuscript to be published in JKPS is required to hold the originality, significance, and recent completeness. The journal is composed of Full paper, Letters, and Brief sections. In addition, featured articles with outstanding results are selected by the Editorial board and introduced in the online version. For emphasis on aspect of international journal, several world-distinguished researchers join the Editorial board. High quality of papers may be express-published when it is recommended or requested.