Weldability and Mechanical Property of Ni53Nb20Ti10Zr8Co6Cu3 Metallic Glass Foil by Laser Welding
Weldability and Mechanical Property of Ni53Nb20Ti10Zr8Co6Cu3 Metallic Glass Foil by Laser Welding
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DOI：
10.1002/9781118144145.ch18
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发表时间：
2011-06
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影响因子：
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通讯作者：
T. Tsumura;Katsunori Kobayashi;K. Nakata;N. Yoneyama;T. Murakami;H. Kimura;A. Inoue
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文献类型：
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作者：
T. Tsumura;Katsunori Kobayashi;K. Nakata;N. Yoneyama;T. Murakami;H. Kimura;A. Inoue
为了评价厚度为25 μm的熔纺Ni基金属玻璃箔的可焊性，使用恒定激光功率为26 W、波长为808 nm的二极管激光束，以2 - 12 m/min的不同焊接速度进行板上珠激光焊接。在12 m/min的高焊接速度下成功地获得了良好的焊缝，同时保持了非晶态;在这些条件下，焊缝由具有非常少量的平均直径为14 nm的纳米晶体的非晶态基体组成。硬度几乎与母材相同（740 HV），焊缝的平均抗拉强度为1312 MPa，是母材的56%。当焊接速度低于6 m/min时，焊缝中心区出现了一个熔合区，熔合区由非晶基体和平均直径为170 nm的大晶粒组成。此外，邻近熔合区的热影响区由具有约1200 HV的高硬度的完全结晶的结构组成，这由于结晶或结构松弛的脆性而导致低的接头强度或焊接裂纹。
In order to evaluate the weldability of a melt-spun Ni-based metallic glass foil with a thickness of 25 µm, bead-on-plate laser welding was carried out at different welding speeds from 2 to 12 m/min using a diode laser beam with a constant laser power of 26 W and wavelength of 808 nm. A sound weld bead, while maintaining the amorphous state, was successfully obtained at a high welding speed of 12 m/min; under these conditions, the weld bead consisted of an amorphous matrix with a very small amount of nanocrystals with a mean diameter of 14 nm. The hardness was almost the same as that of the base metal (740 HV), and the mean tensile strength of the weld bead was 1312 MPa, which is 56% of that of the base metal. At a lower welding speed of less than 6 m/min, a fusion zone appeared in the central zone of the weld bead consisting of the amorphous matrix with comparably large crystals with mean diameter of 170 nm. Further, the heat-affected zones adjacent to the fusion zone consisted of a completely crystallized structure with a high hardness of around 1200 HV, which caused a low joint strength or weld cracking due to the brittleness of crystallization or structural relaxation.