等离子转移弧焊在铝合金表面添加碳化物(表面处理)

F. Matsuda, K. Nakata, S. Shimizu, K. Nagai
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引用次数: 7

摘要

采用等离子转移弧焊(DCSP)工艺,研究了添加碳化物对5083铝合金表面特性的影响。确定了最佳堆焊条件,在此条件下,堆焊金属的焊缝外观较好,孔隙率较小。在此条件下,对含碳化物覆层金属的一些特性进行了评价。结果总结如下:(1)覆层金属中碳化物的最大面积分数在NbC和TiC中约为40%,SiC中约为30%;(2)含碳化物覆层金属的维氏硬度在111 ~ 141hgf/mm2之间;(3)在较高滑动速度下覆层金属的耐磨性得到显著提高,但在较低滑动速度下覆层金属的耐磨性几乎没有提高;(4)在180度弯曲试验中裂纹不出现在覆层金属和母材之间的边界层中,而只出现在覆层区,这意味着覆层具有足够的韧性。
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Carbide Addition on Aluminum Alloy Surface by Plasma Transferred Arc Welding Process(Surface Processing)
Effect of carbide addition on the surface characteristics of aluminum alloy 5083 has been investigated with the plasma transferred arc welding process (DCSP) of NbC, TiC or SiC powder. Optimum overlaying conditions under which bead appearance is superior and porosities in overlaid metal are lesser are determined. Moreover some characteristics of overlaid metal containing carbide are evaluated under these optimum conditions. The results are summarized as follows: (1) The maximum area fraction of carbide in overlaid metal is about 40% for NbC and TiC, and about 30% for SiC, (2) Vickers hardness of overlaid metal containing carbide is in the range between 111 and 141hgf/mm2, (3) Abrasive resistance of overlaid metal at higher sliding speed is remarkably improved by the addition of carbide although that at lower sliding speed is not almost improved, (4) In the 180 degree bend test, cracks appear not in the boundary layer between overlaid and base metals but only in overlaid zone, meaning that the boundary layer is sound enough for ductility.
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