Abstract
In this paper, the authors examine thermodynamic interactions amongst trace and alloying elements at the grain boundaries of low alloy steels through measurement of grain boundary segregation isotherms and determination of time-temperature space plots (interaction maps). In a more recent work, a rational of the effects of microstructure on grain boundary segregation behaviour in a low alloy, NiCrMoV steel, was attempted. In this paper the effects of microstructure (martensitic, bainitic, ferrite-pearlite) on grain boundary segregation processes were elucidated by defining a parameter, referred as interaction severity, Q, which gives an idea of the magnitude of interaction between the two elements. The interaction severity, Q, for a cooperative interaction process was defined as the ratio of the grain boundary coverage of the interacting elements (e.g. for Cr-N, cooperative interaction process, Q = {theta}{sub N}/{theta}{sub Ce}, where {theta} is the grain boundary coverage of the interacting element) and for site-competitive process, it was defined as the sum of the grain boundary coverage of the interacting elements (e.g. for S-Sn site competitive interaction process, Q = {theta}{sub S} + {theta}{sub SN}).
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call