|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
||Structure-property Relationships to Explain the Elasto-plastic Anisotropy of Additively Manufactured Metal Alloys
||Hunter Macdonald, Jishnu Battacharyya, Md Shamsujjoha, Sean Agnew
|On-Site Speaker (Planned)
AM 316L stainless steel produced using manufacturer recommended laser powder bed fusion processing parameters is used as a medium to investigate the sources of mechanical anisotropy. Crystallographic orientation distribution (ODF or texture) measurements were made using both electron backscattered diffraction (EBSD) and X-ray diffraction (pole figures). The elastic properties are predicted using the measured ODF, estimates of the single crystal elastic constants, and homogenization theory. The results agree well with experiment elastic property assessments using ultrasonic pulse-echo velocity measurements and resonant ultrasound spectroscopy (RUS). Similarly, the plastic properties (yield, hardening rates, and thermal activation parameters) were assessed using tension, compression, and stress relaxation tests performed along various directions. The results of these tests and associated crystal plasticity modeling suggest that more than texture is required to explain the observed plastic anisotropy, and the role of residual stress is considered. The developed understanding paves the way to better prediction of failure.
||Additive Manufacturing, Mechanical Properties, Characterization