Role of cavities on deformation-induced martensitic transformation pathways in a laser-welded, neutron irradiated austenitic stainless steel. (15th March 2020)

• Record Type: Journal Article
• Authors: Mao, Keyou S.; Sun, Cheng; Shiau, Ching-Heng; Yano, Kayla H.; Freyer, Paula D.; El-Azab, Anter A.; Garner, Frank A.; French, Aaron; Shao, Lin; Wharry, Janelle P.
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 1
• Page End: 6
• Publication Date: 2020-03-15
• Subjects: Austenitic stainless steel -- Martensitic transformation -- Cavity -- Nanoindentation -- Laser weld; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.10.037
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The role of cavities on deformation-induced martensitic phase transformations is studied in a laser-welded and neutron irradiated austenitic stainless steel. Orientation dependent nanoindentation experiments are performed in the base metal and the weld heat affected zone (HAZ) at room temperature. Transmission electron microscopy study of deformed microstructures indicates indentation-induced α '-martensite forms in the base metal, whereas α '- and ε -martensite arise in the HAZ. The different pathway of martensite phase transformation is attributed to the laser weld-induced annealing of cavities. Our results suggest that deformation-induced martensitic phase transformation of austenitic stainless steel is correlated to neutron irradiated cavity structures. Graphical abstract: Image, graphical abstract