|About this Abstract
||MS&T23: Materials Science & Technology
||Advances in Understanding of Martensite in Steels II
||Substructure Boundary Sliding in Lath Martensite Quantitatively Investigated by Using Molecular Dynamics (MD) Simulation and Experiment
||Meng Zhang, Shuang Gong, Junya Inoue
|On-Site Speaker (Planned)
A molecular dynamics simulation utilizing an artificial neural network potential in combination with experimental measurements is carried out to further understand the plastic deformation in lath martensite. The results show that the substructure boundary sliding strongly depends on the angle between the MRSSP and the boundary, the misorientation angle (θ_m), and the twist components of boundaries. In the experiment, many distributed and localized slip bands (SBs) are observed. Based on simulations, the boundaries with favorable θ_m and twist components are chosen. The profile of the plastic region is in good agreement with the distribution of favorable boundaries. The distributed SBs are caused by that the large Schmid factor (SF) on the boundary leads to many boundaries sliding. Otherwise, the large SF inside of the lath results in dislocation inside of the lath moving to the boundary first and then sliding along the boundary, which makes the localized SBs formation.