磁场辅助激光沉积修复钛合金的组织和性能

发布时间：2018-05-01 05:28

本文选题：钛合金 + 磁场　；参考：《稀有金属材料与工程》2015年05期

【摘要】：为了调控激光沉积修复BT20钛合金的组织,提高其力学性能,将旋转磁场引入到激光修复系统中,考察了不同磁场强度下修复试样的组织和力学性能。结果显示,修复区和基体形成了致密冶金结合,修复区为α/β片层组织,硬度分布从基材到修复区依次提高;在一定范围内,磁场强度越强,α片层长/径比越小,片层组织越细密,修复区硬度越大,HV0.1可达4.4 GPa。表明磁场搅拌减轻了β晶溶质富集,使α片层析出的驱动力减小,需要在更大过冷度下析出,而过冷度的增加,导致形核率的增大,最终导致α层片细化,从而提高沉积层的力学性能。
[Abstract]:In order to regulate the microstructure and improve the mechanical properties of BT20 titanium alloy by laser deposition, the rotating magnetic field was introduced into the laser repair system, and the microstructure and mechanical properties of the repaired samples were investigated under different magnetic field intensities. The results showed that compact metallurgical bonding was formed between the repair zone and the matrix, the repair zone was a 伪 / 尾 lamellar structure, the hardness distribution increased from substrate to repair zone, and in a certain range, the stronger the magnetic field was, the smaller the length / diameter ratio of 伪 lamellar was. The finer the lamellar structure is, the greater the hardness of the repair zone is, and the higher the hardness of HV0.1 is, the 4.4 GPA can be obtained. The results show that magnetic agitation reduces the concentration of 尾 -crystal solute, reduces the driving force of 伪 -slice chromatography, and needs to precipitate at a greater degree of undercooling, while the increase of undercooling results in the increase of nucleation rate and the refinement of 伪 -layer. Thus, the mechanical properties of the deposit are improved.
【作者单位】：沈阳航空航天大学航空制造工艺数字化国防重点学科实验室;
【基金】：国家自然科学基金(51305280,51375316) 国防基础科研项目(A3520133001) 中航工业产学研创新工程(CXY2011SH16) 辽宁省教育厅科学技术研究基金(L2013077)
【分类号】：TG665

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