|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Morphological Evolution of Internally Twinned Martensite in Laser Additively Manufactured Ti6Al4V
||Mangesh Vyankat Pantawane, Shashank Sharma, Abhishek Sharma, Sriswaroop Dasari, Srikumar Banerjee, Rajarshi Banerjee, Narendra Dahotre
|On-Site Speaker (Planned)
||Mangesh Vyankat Pantawane
The multiple thermal cycles during laser powder bed fusion additive manufacturing (LPBF-AM) of Ti6Al4V evolved the morphological features of the martensite phase and twins within them. The separate experiments involving laser surface melting with single, double, triple laser tracks and solutionization of wrought Ti6Al4V were conducted. The significant martensite laths were thinner in the water-quenched Ti6Al4V compared to LPBF-AM Ti6Al4V. The gradual coarsening of martensite lath occurred with successive thermal cycles of single, double, and triple laser track treatments. In addition, multiple generations of twins with distinct morphology were detected in LPBF-Ti6Al4V, which were rarely observed in solutionized and water quenched wrought Ti6Al4V. The multiple generations of twins were also distinctive features of the single laser track treated wrought Ti6Al4V. The evolution of these morphologically and crystallographically diverse martensite phase structures was linked to the computationally predicted thermokinetic and thermomechanical conditions during thermal treatments experienced during the LBPF-AM process.