Lazerle metal toz ergitme prosesinde kalıntı gerilmelerin mikro girinti tekniği ile incelenmesi

Abstract

Powder bed fusion additive manufacturing of Inconel 625 parts  Microhardness testing using different loads and investigation using optical microscope  Residual stress identification and benchmarking with previous studies Figure A. Applied methods and calculated residual stresses of SLMed (L-PBF AM) Inconel 625 Purpose: The purpose of the presented paper is to investigate residual stresses of additively manufactured part by low-cost micro indentation technique. Theory and Methods: This paper contributes to scientific knowledge by applying the low-cost micro indentation residual stress measurement technique to additively manufactured parts. Investigation was conducted on Inconel 625 samples produced by Selective Laser Melting (Laser Powder Bed Fusion). Necessary material properties were calculated by using JMatPro® software. Results: Compressive stresses were generated at the top surface of the samples as the result of SLM process. The stress magnitude showed values between 100 MPa-150 MPa with a considerable increase within 0.02 mm indentation depth. The findings were benchmarked with the previous studies conducted with other residual stress measurement methods and found to be comparable. Conclusion: Residual stresses are one of the common problems associated with metal additive manufacturing including SLM process. Various techniques can be employed to identify the so-called residual stresses and micro indentation is one of those having low-cost investment requirement advantage and easiness of application. This paper showed the applicability of the technique on Inconel 625 samples produced by SLM by benchmarking the findings with the previous studies.