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首页> 外文期刊>Surface & Coatings Technology >Laser surface alloying of a marine propeller bronze using aluminium powder Part I: Microstructural analysis and cavitation erosion study
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Laser surface alloying of a marine propeller bronze using aluminium powder Part I: Microstructural analysis and cavitation erosion study

机译：用铝粉对船用螺旋桨青铜进行激光表面合金化处理I.显微组织分析和空蚀研究

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In a previous study laser surface melting (LSM) was employed to improve the cavitation erosion resistance of manganese-nickel-alummium-bronze (MAB)[9,10][C.H. Tang, F.T. Cheng, H.C. Man, Surf. Coat. Technol. 182 (2004) 300; C.H. Tang, F.T. Cheng, H.C. Man, Mater. Sci. Eng. A 373 (2004) 195]. To further enhance the improvement, laser surface alloying (LSA) using fine aluminum powder has been attempted in the present study. By employing appropriate laser processing parameters, a homogeneous alloyed layer of thickness about 1 mm, free of cracks or pores, was obtained. The alloyed layer was composed of a single phase, the bee p-phase, with a Knoop microhardness higher than 300 HK. Cavitation erosion test in deionized water of the alloyed layer recorded a 30-fold improvement in the cavitation erosion resistance compared with as-received MAB. The resistance achieved in LSA was more than 3 times that by LSM. The relatively low-cavitation erosion resistance of as-received MAB was attributable to its heterogeneous and multi-phased structure. Surface-alloyed MAB, on the other hand, was characterized by a homogeneous microstructure which was single-phased. Apart from microstructural homogenization, the enhancement in cavitation erosion was also related to the increase in microhardness. Morphological evolution monitored over a period of cavitation erosion test revealed that brittle fracture mode prevailed, with material being chipped away from weak triple-junctions and grain boundaries. Such a mode of erosion damage was similar to the case in laser surface-melted MAB, but at a much milder degree, consistent with a higher erosion resistance in the case of LSA. The higher Al content in the LSA samples which resulted in a harder phase could be the major reason for the higher resistance. In addition, the relatively larger grains in the Al-alloyed samples resulted in less grain boundaries, which were vulnerable sites for erosion initiation, hence also contributing to higher cavitation erosion resistance compared with the lasermelted samples. (c) 2005 Elsevier B.V. All rights reserved.
机译：在先前的研究中，采用激光表面熔化（LSM）来提高锰-镍-铝-青铜（MAB）的抗气蚀性能[9,10] [C.H.。唐风郑HC男人，冲浪。涂层。技术。 182（2004）300; C.H.唐风郑HC男人，Mater。科学。 A 373（2004）195]。为了进一步提高改进效果，在本研究中尝试了使用细铝粉的激光表面合金化（LSA）。通过采用适当的激光加工参数，获得了厚度均匀的合金层，其厚度约为1毫米，无裂纹或气孔。合金层由单相，蜂p相组成，努氏显微硬度高于300 HK。与原先的MAB相比，在合金层的去离子水中进行的气蚀实验表明，其抗气蚀性提高了30倍。 LSA中获得的抵抗力是LSM的3倍以上。收到的MAB相对较低的抗气蚀性归因于其多相和多相结构。另一方面，表面合金化的MAB的特征是单相的均匀微观结构。除了显微组织均质化以外，空蚀的增强还与显微硬度的增加有关。在一段时间的空蚀试验中监测的形态演变表明，脆性断裂模式占主导，材料从弱的三重结和晶界剥落。这种腐蚀破坏的模式与激光表面熔化的MAB的情况相似，但是程度要轻得多，这与LSA的较高的抗腐蚀能力相一致。 LSA样品中较高的Al含量会导致更硬的相，这可能是电阻较高的主要原因。另外，Al合金样品中相对较大的晶粒导致较少的晶界，这是易发生腐蚀的部位，因此与激光熔化的样品相比，还有助于更高的抗气蚀性。 （c）2005 Elsevier B.V.保留所有权利。

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