激光熔覆再制造对试件拉伸性能与组织的影响
The Influence of Laser Cladding Remanufacturing on Tensile properties and Organization of Specimen
成细洋, 邱长军, 张彦
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作者单位：南华大学 机械工程学院
中文关键字：再制造；激光熔覆；组织；断口形貌
英文关键字：remanufacturing; laser cladding; organizations; fracture surface
中文摘要：本文通过在标准拉伸试样上采用激光再制造的方式制得厚度为0.4mm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的拉伸性能的影响，并采用金相显微镜(OM)观察拉伸试样组织，采用扫描电镜（SEM）分析了断口形态，实验结果表明，当熔覆层厚度为0.4mm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-应变曲线的相似，弹性模量基本上没有变化，最大拉伸强度基本上持平。而屈服强度明显降低了，而且断裂时，总的变形量明显减少。激光熔覆再制造后的拉伸试件的断口都不在熔覆区。断裂的位置大致与普通试样相同。
英文摘要： This work produced the Ni25AA cladding layer with thickness about 0.4 mm on the standard of tensile samples using the laser remanufacturing way. Then tensile experiments were carried out on the samples to study the influence of laser cladding manufacturing process on the tensile properties of the samples; and the organization was observed by metallurgical microscope, the fracture was analysed by scanning electron microscope (SEM) . The experimental results show that, when thickness of cladding layer is 0.4 mm, the stress-strain curve of specimens by laser cladding manufacturing is similar to that of ordinary specimens, elastic modulus and the maximum tensile strength basically did not change. However, yield strength and total deformation amount before breaking significantly decrease. Fracture of tensile specimens by laser cladding remanufacturing is not located in cladding area. The location of the fracture is the same with common specimens roughly.