Effect of low energy helium irradiation on mechanical properties of 304 stainless steel
Effect of low energy helium irradiation on mechanical properties of 304 stainless steel
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DOI：
10.1016/j.fusengdes.2005.09.072
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发表时间：
2006-02
影响因子：
1.7
通讯作者：
Takayuki Kawakami;K. Tokunaga;N. Yoshida
中科院分区：
文献类型：
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作者：
Takayuki Kawakami;K. Tokunaga;N. Yoshida
采用拉伸试验和纳米压痕硬度试验研究了低能氦辐照304不锈钢的力学性能。试样规格为2.8mm×5.4mm×0.1mm，全长12.4mm。在室温下用8 keV氦离子辐照样品，573 K和873 K，直至3× 1021 He/m2的注量。在3.33×10−3s−1的应变速率下对未辐照和辐照试样进行拉伸试验。在每种辐照条件下，一个试样被测试到失效，另外两个试样被塑性应变到10%和20%。室温拉伸后，试样表面形成直径约500 nm的气泡。辐照还观察到水疱的一些剥落。当辐照温度升高时，在拉伸试验过程中，在表面上形成大量尺寸约为几微米的裂纹以及剥落。在室温下辐照的试样的屈服应力。573 K比未辐照试样的提高约10%。纳米压痕测试结果表明，近表面的硬度增加依赖于辐照温度。
Mechanical properties of low energy He irradiated 304SS have been investigated by means of tensile test and nano-identation hardness tests. Specimen size is 2.8mm×5.4mm×0.1mm in gauge and 12.4mm in total length. Specimens are irradiated with 8keV helium ions at R.T., 573K and 873K up to the fluence of 3×1021He/m2. Tensile tests are performed on unirradiated and irradiated specimens at a strain rate of 3.33×10−3s−1. In every irradiation condition, one specimen is tested to failure and the other two specimens are strained plastically to 10% and 20%. Formation of blisters with a diameter of about 500nm is observed on the surface of tensile-tested specimens after R.T. irradiation. Some exfoliation of the blisters is also observed. When the irradiation temperature increases, a large number of cracks with a size of about several micrometers are formed on the surface together with exfoliation during the tensile test. The yield stress of specimens irradiated at R.T. and 573K increases about 10% in comparison with that of the unirradiated specimen. The result of nano-indentation tests indicate that hardness near the surface increases depending on the irradiation temperature.