Martensite formation during incremental cooling of Fe-Cr-Ni alloys: An in-situ bulk X-ray study of the grain-averaged and single-grain behavior. (15th July 2017)

• Record Type: Journal Article
• Authors: Tian, Ye; Lienert, Ulrich; Borgenstam, Annika; Fischer, Torben; Hedström, Peter
• Is Part Of: Scripta materialia. Number 136(2017)
• Page Start: 124
• Page End: 127
• Publication Date: 2017-07-15
• Subjects: Martensitic phase transformation -- Synchrotron radiation -- Austenitic stainless steel -- In-situ investigation -- Three-dimensional X-ray diffraction (3DXRD); Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.04.020
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The formation of martensite (ε and α ′ ) in metastable austenitic Fe-18Cr-(10-11.5)Ni alloys was investigated in-situ during cooling. High-energy X-rays were used to study the bulk of the alloys. Both grain-averaged and single-grain data was acquired. ε played an important role in the formation of α ′ with an indistinguishable difference in the martensite start temperature. The single-grain data indicated that stacking faults appear as precursors to ε. An analogy can be made with deformation-induced martensitic transformation, where the generation of nucleation sites would significantly lower the driving force required to overcome the energy barrier in low stacking fault energy Fe-Cr-Ni alloys. Graphical abstract: