In this paper, a wear-resistant alloy with the chemical composition of 16 wt% Cr-3 wt% B-0.6 wt% C-1 wt% Mn-Fe, in which M 2 B was the antifriction skeleton, was prepared in a medium-frequency induction furnace. The microstructure and mechanical properties were experimentally investigated. The results show that the microstructure of the Fe-Cr-B alloy was composed of lath martensite and clavate, reticular, and clustering borides (M 2 B). After the thermal treatment, the morphology, chemical composition, and volume fraction of the M 2 B did not change significantly. Because of the reduction in element saturation, secondary borides M 23 (B,C) 6 precipitated from the matrix, which resulted in a decrease in matrix microhardness. As a result, the bulk hardness and abrasive resistance of the alloy accordingly decreased, and the impact toughness inversely increased. According to the results of XRD, electronic probe microanalyzer (EPMA), and TEM, the chemical formula of M 2 B was FeCr 0.89 Mn 0.14 (B,C), which resulted in a body-centered tetragonal (BCT) structure. The chemical formula of the M 23 (B,C) 6 was Fe 17.97 Cr 4.13 Mn 1.14 (B,C) 6 , which resulted in a face-centered cubic (FCC) structure.
A multiphysics model based on the finite element method was adopted, emphasizing a deeper insight into the rarely studied crevice corrosion behavior of stainless steel and titanium overlapping. The model takes into account damage due to corrosion inside the crevice, different species transportation, local electrochemical reactions, homogeneous reactions in the electrolyte, and formation of a corrosion product and its influence on electrochemical reaction. The simulation results show that the location of the greatest attack for stainless steel is at the crevice opening; this finding is consistent with the IR drop theory. The potential increases gradually from the tip to the opening of the crevice, and the current changes smoothly following a sharp rise at the opening. The minimum and maximum values of pH and Cl− concentration are both in the middle and opening of the crevice. The influence of the crevice size on corrosion is also discussed in detail.
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