材料工程2017，Vol.45Issue(4)：34-40,7.DOI:10.11868/j.issn.1001-4381.2015.001223
Si对明弧堆焊合金M7C3相及耐磨性的影响
Effect of Silicon on M7C3 Phases and Abrasion Resistance of Open Arc Hardfacing Alloys
摘要
Abstract
Fe-17Cr-4C-2V-Mn-Si-Ti complex system hardfacing alloys were deposited by using flux-cored wire self-shielded open arc welding.The effects of silicon on their M7C3 (M=Fe, Cr, V, Mn) phases and abrasion resistance were investigated by OM, XRD and SEM.The results show that, with silicon content increasing from 0.6%(mass fraction) to 2.4%, the size of primary M7C3 carbides gradually reduces and transites from rod-like shape to block-like shape in dispersion distributing state.γ-Fe phases, which adjacent to those primary M7C3 grains, progressively reduce until disappear.It dues to that silicon can change the precursor of primary M7C3 nucleates in nature, e.g.liquid high carbon atom clusters and it results in the change of their morphology, distribution and size.The wear test results indicate that the abrasion resistance of open arc hardfacing alloys improves firstly and then reduces when silicon content increases from 0.6% to 2.4%.The optimum abrasion resistance is acquired at 1.5%Si.The analysis on the surface worn morphologies show that the micro-cutting and micro-spalling wearing mechanisms coexist.关键词
明弧/堆焊/多元/显微组织/耐磨性Key words
open arc/hardfacing/complex/microstructure/abrasion resistance分类
通用工业技术引用本文复制引用
田兵,龚建勋,刘江晴,吴慧剑..Si对明弧堆焊合金M7C3相及耐磨性的影响[J].材料工程,2017,45(4):34-40,7.基金项目
湖南省自然科学湘潭联合基金资助项目(2015JJ5031) （2015JJ5031）
国家自然科学基金面上资助项目(51271158) （51271158）
