Effect of tungsten and tantalum on the low cycle fatigue behavior of reduced activation ferritic/martensitic steels
Effect of tungsten and tantalum on the low cycle fatigue behavior of reduced activation ferritic/martensitic steels
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DOI：
10.1016/j.fusengdes.2012.01.020
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发表时间：
2012-05
影响因子：
1.7
通讯作者：
V. Shankar;K. Mariappan;A. Nagesha;G. Reddy;R. Sandhya;M. D. Mathew;T. Jayakumar
中科院分区：
文献类型：
--
作者：
V. Shankar;K. Mariappan;A. Nagesha;G. Reddy;R. Sandhya;M. D. Mathew;T. Jayakumar
低活化铁素体/马氏体(RAFM)钢是国际热核实验堆(ITER)实验包层模块的候选材料。为了估算构件的寿命和与构件结构完整性有关的问题，必须了解几种退化机制，如热疲劳、低周疲劳、蠕变疲劳相互作用、蠕变、辐照硬化、膨胀和与辐照脆化相关的相不稳定。目前的工作集中在钨和钽对RAFM钢低周疲劳行为的影响。合金元素钨和钽均提高了疲劳寿命。Ta对提高疲劳寿命的影响比W对提高疲劳寿命的影响高一个数量级。在本研究的基础上，W的最佳含量为1.4wt.%。RAFM钢的软化行为与钢中W和Ta含量有很强的相关性。
Reduced activation ferritic/martensitic (RAFM) steels are candidate materials for the test blanket modules of International Thermonuclear Experimental Reactor (ITER). Several degradation mechanisms such as thermal fatigue, low cycle fatigue, creep fatigue interaction, creep, irradiation hardening, swelling and phase instability associated irradiation embrittlement must be understood in order to estimate the component lifetime and issues concerning the structural integrity of components. The current work focuses on the effect of tungsten and tantalum on the low cycle fatigue (LCF) behavior of RAFM steels. Both alloying elements tungsten and tantalum improved the fatigue life. Influence of Ta on increasing fatigue life was an order of magnitude higher than the influence of W on improving the fatigue life. Based on the present study, the W content was optimized at 1.4wt.%. Softening behavior of RAFM steels showed a strong dependence on W and Ta content in RAFM steels.