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Mechanical Responses of Cold-Rolled AM350 Under Tension: Microstructure, Phase Transformation, and Fracture Mechanism
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DOI：10.1002/adem.71063.png)
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Abstract
En 中文
In this article, the tensile properties and fracture mechanisms of AM350 are systematically investigated using experimental techniques such as material testing machines, digital image correlation (DIC), transmission electron microscope (TEM), and X-ray diffraction (XRD). The results show that the cold-rolled AM350 sheet exhibits a dual-phase structure consisting of BCC ferrite and FCC austenite in a nearly 1:1 ratio. During tensile deformation, a phase transition from FCC to BCC occurs, resulting in a single-phase BCC structure. Additionally, deformation-induced dislocation rearrangement forms subgrain structures, and the area of large grain reference orientation deviation (GROD > 5°) reached 33.2% (a 444.3% increase). The plastic deformation mechanisms of AM350 mainly involve dislocation features (e.g., high-density dislocations, dislocation walls, tangles, arrays, and pile-ups) and the precipitation of the Laves phase (Fe2Mo). Observations of the dislocation features near the phase boundaries reveal that these precipitates do not exist in isolation but strongly interact with dislocations during deformation. This interaction effectively alleviates stress concentration, thereby suppressing crack nucleation and preventing premature brittle fracture. Ultimately, fracture initiates at grain boundary weak zones and then propagates and coalesces until failure.
Keywords:
AM350
deformation mechanisms
duplex stainless steel
fracture failure
tension properties
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