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首页> 外文期刊>Physica, B. Condensed Matter >Positron annihilation study of the micro-defects induced by cavitation in mild steel
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Positron annihilation study of the micro-defects induced by cavitation in mild steel

机译：正电子an没研究低碳钢中空化引起的微缺陷

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摘要

Cavitation-induced micro-defects in mild steel after cavitation experiment in the fluid field have been studied by positron Doppler broadening measurement and positron annihilation lifetime spectra (PALS). Depth-resolved positron Doppler S-parameter (DPDS) results showed that S-parameter increased and micro-defects between the surface and the bulk has obvious variation with depth during the cavitation process. From the positron lifetime results, it was found that the size and number of micro-defects increase with the development of cavitation. These results suggest that more micro-defects are generated in mild steel bulk during the cavitation process than those in the mild steel surface layer region, although more mico-defects seen in the mild steel surface layer. Moreover, the size of micro-defects in mild steel bulk increases remarkably owing to their transfer and aggregation. (C) 2008 Elsevier B.V. All rights reserved.
机译：通过正电子多普勒展宽测量和正电子an没寿命谱（PALS）研究了流态中空化实验后低碳钢中空化引起的微缺陷。深度分辨正电子多普勒S参数（DPDS）结果表明，在空化过程中，S参数增加，表面与主体之间的微缺陷随深度而变化明显。从正电子寿命结果，发现微缺陷的尺寸和数量随着空化的发展而增加。这些结果表明，在空化过程中，与低碳钢表层区域相比，在高碳钢块中产生的微缺陷更多，尽管在低碳钢表层中观察到了更多的微观缺陷。此外，由于其转移和聚集，低碳钢块中的微缺陷的大小显着增加。 （C）2008 Elsevier B.V.保留所有权利。

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