Study of solute segregation behavior at carbide–ferrite interfaces in 16MND5 welds

2020 
Abstract The solute segregation behavior at two types of carbide–ferrite interfaces was investigated by Atom Probe Tomography (APT) technique in a 16MND5 weld before and after ion irradiation. The two types of carbides are cementite and M2.0-3.2C carbides. Effects of these intergranular carbides on solute segregation behavior at the vicinal Grain Boundaries (GBs) were discussed. No influence was observed within the first tens of nm away from carbides. However, these carbides introduce effective sites for solute segregation (P, Mn, Si and Ni). The segregation of one or several chemical species was observed at interfaces. It is also revealed that the intersection region between carbide and the adjacent GB favors higher P segregation than any other region. After ion irradiation, there is a significant increase of P segregation level at both cementite-ferrite interfaces and M2.0-3.2C carbide–ferrite interfaces, which could be attributed to a Radiation Enhanced Segregation (RES) of P. The increased P segregation at interfaces could contribute to the radiation embrittlement. Under both conditions, there is a higher average P segregation level at cementite-ferrite interfaces than M2.0-3.2C carbide–ferrite interfaces.
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