Fatigue strength of small-scale type 304 stainless steel thin films
Fatigue strength of small-scale type 304 stainless steel thin films
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DOI：
10.1016/j.msea.2006.03.090
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发表时间：
2006-06
期刊：
影响因子：
6.4
通讯作者：
Guang-Ping Zhang;K. Takashima;Y. Higo
中科院分区：
文献类型：
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作者：
Guang-Ping Zhang;K. Takashima;Y. Higo
采用动态弯曲微梁对微米级304不锈钢薄膜的疲劳强度进行了实验研究。应力-寿命数据从R=0.15的试验扩展到完全反向加载条件，以便与散装304 SS的文献值进行比较。详细描述了疲劳损伤过程。结果表明，微米级试样的疲劳极限高于304不锈钢的疲劳极限。疲劳损伤被发现起源于循环应变局部区域内的晶粒。结果表明，微米级304不锈钢的疲劳损伤行为仍遵循块体材料的疲劳损伤行为，但由于细晶粒尺寸和小几何尺寸的影响，疲劳强度有所提高。
This paper presents an experimental study of the fatigue strength of micrometer scale 304 stainless steel (SS) thin films using dynamic bending microbeams. The stress-life data was extended from the tests with R=0.15 to the condition of fully reversed loading in order to compare with literature values of the bulk 304 SS. Fatigue damage process was characterized in detail. The results show that the fatigue endurance limit of the micrometer scale samples is higher than that of the bulk 304 SS. Fatigue damage was found to originate from cyclic strain localized regions within the grains. It is argued that fatigue damage behaviors in the micrometer scale 304 SS still follow that of the bulk material, but the fatigue strength has been enhanced due to the influences of both fine grain size and small geometrical dimensions.