Microstructural and Non-Destructive Evaluation of Creep Damage in Martensitic Stainless Steel
Microstructural and Non-Destructive Evaluation of Creep Damage in Martensitic Stainless Steel
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马氏体不锈钢蠕变损伤的微观结构和无损评估
DOI：
10.2472/jsms.58.136
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Y. Kamada
中科院分区：
文献类型：
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作者：
T. Ohtani;F. Yin;Y. Kamada
采用超声衰减法研究了马氏体不锈钢（JIS-SUS403）蠕变过程中微观组织的演变。在873K、120MPa的拉应力下获得一系列不同应变的蠕变试样后，从蠕变试样中去除小试样，用电磁声共振（EMAR）测量自由振动共振频率和衰减系数。EMAR是共振声学技术与非接触式电磁声换能器（EMAT）的结合。通过磁致伸缩机制与EMAR自由振动共振，测量了小蠕变试样的超声衰减变化。衰减测量本质上没有任何能量损失，导致金属样品的纯粹衰减。利用电子背散射衍射（EBSD）和透射电镜（TEM）观察了微观结构的演变。小样本的结果与之前大样本的结果显示出相同的趋势。我们提出了一种非破坏性的方法，使用EMAR来评估在役结构金属样品的蠕变损伤。
We studied the evolution of microstructure in a Martensitic Stainless Steel (JIS-SUS403) during creep by monitoring ultrasonic attenuation. After a series of creep samples with various strains under a tensile stress of 120MPa at 873K was obtained, small samples were removed from the creep samples and free vibration resonance frequencies and attenuation coefficients were measured with electromagnetic acoustic resonance (EMAR). EMAR is a combination of the resonant acoustic technique with a non-contact electromagnetic acoustic transducer (EMAT). We measured changes in ultrasonic attenuation of the small creep sample by free vibration resonance with EMAR through a magnetostrictive mechanism. The attenuation measurement is inherently free from any energy loss, resulting in pure attenuation in a metal sample. Furthermore, the evolution of microstructure was observed with electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The result from the small samples showed the same trend as our previous result from larger sample. We propose a non-destructive method using EMAR to evaluate creep damage in small specimens sampled from structural metals in-service.