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Improvement of cavitation erosion resistance of AISI 316 stainless steel by laser surface alloying using fine WC powder

机译:通过使用细WC粉末进行激光表面合金化改善AISI 316不锈钢的抗气蚀性

摘要

Fine WC powder of approximately 1 μm size was employed as a convenient source of tungsten and carbon in the laser surface alloying of AISI 316 stainless steel for improving the cavitation erosion resistance. A slurry containing WC powder was preplaced on the substrate by pasting and processed with a high-power CW Nd:YAG laser to achieve surface alloying. The composition and microstructure of the alloyed layer and the phases formed were investigated by energy-dispersive X-ray spectroscopy, optical microscopy, scanning electron microscopy, and X-ray diffractometry, respectively. The cavitation erosion behavior of the laser surface-alloyed samples in 3.5% NaCl solution was studied with a vibratory cavitation erosion tester. The microhardness of the alloyed layer increases with the total W content in the layer. By employing proper processing parameters, an alloyed layer that is hard but not too brittle can be formed, with a cavitation erosion resistance that may reach more than 30 times that of the asreceived 316. The improvement in cavitation erosion resistance may be attributed to the increase of W in solid solution and to the precipitation of dendritic carbides, both resulting from the dissociation of the fine WC powder during laser processing.
机译:在AISI 316不锈钢的激光表面合金化过程中,将大小约为1μm的细WC粉用作钨和碳的便捷来源,以提高抗气蚀性。通过粘贴将包含WC粉的浆液预先放置在基板上,并用高功率CW Nd:YAG激光进行处理,以实现表面合金化。分别通过能量色散X射线光谱,光学显微镜,扫描电子显微镜和X射线衍射法研究了合金层的组成和微观结构以及形成的相。用振动空化腐蚀测试仪研究了激光表面合金化样品在3.5%NaCl溶液中的空化腐蚀行为。合金层的显微硬度随层中总W含量的增加而增加。通过采用适当的工艺参数,可以形成坚硬但不太脆的合金层,其耐空蚀性可以达到所接受的316的30倍以上。耐空蚀性的提高可以归因于其增加固溶体中的钨含量以及树枝状碳化物的沉淀,这都是由于细WC粉末在激光加工过程中解离所致。

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