Influence mechanism of K2SO4addition on microstructure, mechanical properties and abrasion resistance of Fe-2wt%B alloy
发布日期: 2021-01-21 发布者: 郑洋 阅读: 10

摘要

Fe2B-type boride exists in Fe-B alloy with a form of netlike, rod-shaped, or fishbone structure. This results in high susceptibility of alloy to fracture. To improve the morphology of Fe2B, various contents of K2SO4 are added into an Fe-2wt%B alloy. The microstructure, mechanical properties and abrasion resistance of the modified alloy have been analyzed systematically.The results show that the alpha-MnS forms in the alloy, and increases with the increased K2SO4 in a relationship of y = 1.68x + 0.03. Moreover, the alpha-MnS can act as effective heterogeneous nuclei of M2B (where M represents Cr, Mn, and Fe), owing to a low lattice misfit of (111)(alpha-MnS)//(110)(M2B). Meanwhile, the addition of element K can result in the formation of adsorbed film (K+ film) on the surface of M2B. By the joint action of alpha-MnS and K+ film, the structure of M2B changes from net-like into isolated block-shaped after heat treatment, and the shape factor K value of M2B increases from 0.13 to 0.44 with an increment of 241%. The change of M2B morphology effectively promotes an improvement of impact toughness and abrasion resistance of the alloy as a result. (c) 2020 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).