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通过在标准拉伸试样上采用激光再制造的方式制得厚0.4 mm的Ni25AA熔覆层,再进行拉伸实验,研究激光熔覆再制造过程对试样拉伸性能的影响,并采用金相显微镜观察拉伸试样组织,采用扫描电镜分析断口形态。结果表明,当熔覆层厚度为0.4 mm时,激光熔覆再制造后的拉伸试件的应力-应变曲线和普通试件应力-应变曲线相似,弹性模量基本没有变化,最大拉伸强度基本持平。而屈服强度明显降低,而且断裂时,总的变形量明显减小。激光熔覆再制造后的拉伸试件的断口都不在熔覆区,断裂位置大致与普通试样相同。
A 0.4 mm thick Ni25AA cladding layer was prepared by laser remanufacturing on a standard tensile specimen. The tensile test was carried out to study the effect of laser cladding remanufacturing process on the tensile properties of the specimen. Gold Tissue specimens were observed by phase microscope and analyzed by scanning electron microscopy. The results show that when the cladding thickness is 0.4 mm, the stress-strain curves of the tensile specimens after laser cladding and remanufacturing are similar to the stress-strain curves of ordinary specimens with little change in the elastic modulus. The maximum tensile strength Flat. While the yield strength is obviously reduced, and the total deformation is obviously reduced when the fracture occurs. After the laser cladding remanufactured tensile specimen fracture are not in the cladding zone, the fracture location is generally the same as the normal sample.