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以玻璃包覆Fe69Co10Si8B13合金微丝为研究对象,研究了拉丝速率及冷却条件对微丝尺寸、结构及力学性能的影响;分析了不同冷却条件下微丝的拉伸断裂机制.结果表明:当拉丝速率由5m.min-1增加到400m.min-1时,微丝及芯丝直径分别由95.2μm和26.9μm减小到14.5μm和7.2μm;拉丝速率由50m.min-1增加到400m.min-1时,芯丝抗拉强度由1305MPa增大到5842MPa;冷却距离小于20mm时,微丝尺寸和抗拉强度均随冷却距离的增大而显著减小;冷却距离大于20mm时,冷却距离对微丝尺寸和抗拉强度的影响很小;采用水冷方式且拉丝速率大于5m.min-1时所获得的微丝均为非晶态结构,而采用空冷方式制备的非晶态微丝的拉丝速率应大于或等于20m.min-1;芯丝的断裂方式为伴随不均匀塑性流变的脆性断裂,且脆性断裂倾向随冷却距离的增加而增大.
The glass-coated Fe69Co10Si8B13 alloy microfilament was used as the research object to study the influence of the drawing speed and cooling conditions on the microfilament size, structure and mechanical properties.The tensile fracture mechanism of the microfilaments under different cooling conditions was analyzed.The results showed that when drawing When the velocity increased from 5m.min-1 to 400m.min-1, the diameters of the microfilaments and the core filaments decreased from 95.2μm and 26.9μm to 14.5μm and 7.2μm, respectively. The drawing speed increased from 50m.min-1 to 400m. min-1, the tensile strength of the core wire increased from 1305MPa to 5842MPa; when the cooling distance was less than 20mm, the micro-wire size and tensile strength decreased significantly with the cooling distance increasing; when the cooling distance was more than 20mm, the cooling distance The effect on the microfilament size and tensile strength is very small. When the water-cooling method is adopted and the drawing speed is more than 5m.min-1, the obtained microfilaments are all amorphous, while the amorphous microfilaments prepared by air-cooling The drawing rate should be greater than or equal to 20m.min-1; the breaking mode of the core wire is brittle fracture with non-uniform plastic rheology, and the brittle fracture tendency increases with the cooling distance.