Deformation Behavior and Microstructure of Ti6Al4V Manufactured by SLM

By Pavel Krakhmalev, Gunnel Fredriksson, I. Yadroitsava, N. Kazantseva, A. du Plessis, I. Yadroitsev. 2016

150 citations recorded by the source corpus.

Abstract Mechanical properties, porosity, and microstructure of Ti6Al4V (ELI) material produced by Selective Laser Melting (SLM) under controlled oxygen content were analyzed. Fully martensitic α’structure with high dislocation density and stacking faults was observed in both as-built and stress relieved samples by means of XRD and TEM. Tensile {101 2} twinning was identified by TEM and electron diffraction. Accommodation of thermal stresses during manufacturing was suggested as a possible reason for twinning. Computed tomography of pores was carried out. Pores in the specimens were evenly distributed and mostly had an elongated shape. Defect analysis by micro CT scans in pre-strained samples confirmed that the pore coalescence was the main crack formation mechanism in the final fracture with typical cup-and-cone fracture morphology. Additionally, typical dimples and quasi-cleavage were revealed. Mechanical properties of the samples after stress relieving heat treatment at 650°C for 3 h are complied with the international standard for Ti alloys for biomedical applications.

Subfields: Automotive Engineering, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/8131a56779ea952297da5adca6ee5102e4e63b08

Citations in the corpus

• X-Ray Microcomputed Tomography in Additive Manufacturing: A Review of the Current Technology and Applications (2018, unknown): “76 In this work, a unique analysis was devised through which the tensile necking behavior was visualized and quantified using a CAD variance analysis between the deformed sample and a best-fit cylinder to the original shape.”