Subsurface Defect Evaluation of Selective-Laser-Melted Inconel 738LC Alloy Using Eddy Current Testing for Additive/Subtractive Hybrid Manufacturing

Chinese Journal of Mechanical Engineering

Bi Zhang¹  Guanhui Ren¹  Sai Guo² 

[1]Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China

[2]Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China

[3]State Key Laboratory of Ultra-precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China

关键词: Eddy current testing;    Subsurface defect;    Additive/subtractive hybrid manufacturing;    Selective laser melting;    Inconel 738LC alloy;   

DOI  :  10.1186/s10033-021-00633-9

来源: Springer

【 摘 要 】

New materials and manufacturing technologies require applicable non-destructive techniques for quality assurance so as to achieve better performance. This study comprehensively investigated the effect of influencing factors including excitation frequency, lift-off distance, defect depth and size, residual heat, and surface roughness on the defect EC signals of an Inconel 738LC alloy produced by selective laser melting (SLM). The experimental investigations recorded the impedance amplitude and phase angle of EC signals for each defect to explore the feasibility of detecting subsurface defects by merely analyzing these two key indicators. Overall, this study revealed preliminary qualitative and roughly quantitative relationships between influencing factors and corresponding EC signals, which provided a practical reference on how to quantitively inspect subsurface defects using eddy current testing (ECT) on SLMed parts, and also made solid progress toward on-line ECT in additive/subtractive hybrid manufacturing (ASHM) for fabricating SLMed parts with enhanced quality and better performance.

【 授权许可】

CC BY