|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location Specific, Processing-Microstructure-Property-Relationships III
||Implications of Crystallographic Texture and High Dislocation Density in Selective Laser Melted Stainless Steel 316L
||Sean Agnew, Md Shamsujjoha, J. M. Fitz-Gerald
|On-Site Speaker (Planned)
Solidification processes can induce a preferred crystallographic orientation (texture) because preferred growth directions align with imposed thermal gradients. Vendors of additive manufacturing machines have sought to ameliorate this effect by employing various beam raster strategies. The crystallographic texture and ultrafine cellular-dendritic microstructure of 316L produced on an EOS M280 machine, using standard procedures, will be described in detail. In brief, a high dislocation density is revealed by X-ray diffraction line profile analysis and revealed to be primarily associated with solidification cell boundaries. The texture is characterized by <100> aligned with the overall scan direction and <001> tilted somewhat from the build direction. The impact of this microstructure and texture on the stiffness, strength, strain hardening, and ductility will be modeled and discussed. Notably, the direction parallel to the build direction is shown to undergo extensive deformation twinning, which leads to protracted strain hardening and resistance to plastic instability.
||Planned: Supplemental Proceedings volume