摘要
采用激光熔丝沉积增材制造技术制备了添加不同含量WC的Fe-17Mn-6Si-9Cr-5Ni合金,考察其在油润滑条件下的摩擦磨损行为,分析并初步讨论了WC的添加量对Fe-Mn-Si-Cr-Ni合金耐磨机制的影响.结果表明,在Fe-Mn-Si-Cr-Ni合金中,当WC添加量不超过1%(质量分数)时,合金硬度随着WC添加量的增多而增大,但其耐磨性不增反降,此时合金的耐磨性主要受铁基记忆合金由于应力诱发马氏体相变带来的特有减摩抗磨特性的影响;而当WC的添加量增大提高至2%和4%时,合金硬度随着WC添加量的增多而继续增大,其耐磨性也随之有所提高,但仍仅与未添加时大致相当,此时在摩擦磨损次表层中已观察不到马氏体板条,可以认为此时合金的耐磨性主要受WC颗粒的弥散强化的影响.在文中研究条件下,添加0.25%WC的合金耐磨性最好.
Fe-17Mn-6Si-9Cr-5Ni alloy with varying WC concentrations was fabricated via laser wire deposition additive manufacturing.Their tribological performance under oil-lubricated conditions was systematically evaluated to elucidate the influence of WC addition amount on the wear resistance of Fe-Mn-Si-Cr-Ni alloy.Results demonstrate that in the Fe-Mn-Si-Cr-Ni alloy,when the WC addition amount does not exceed 1%(by mass fraction),the hardness of the alloy increases with the increase in WC addition amount,but its wear resistance actually decreases.At this point,the wear resistance of the alloy is mainly influenced by the intrinsic friction-reducing and wear-resistant properties brought about by the stress-induced martensitic phase transformation in the iron-based memory alloy.However,when the WC addition amount is increased to 2%and 4%,the hardness of the alloy continues to increase with the increase in WC addition amount,and its wear resistance improves accordingly,which is still only approximately the same as when no additives are added.At this point,martensite laths can no longer be observed in the sub-surface layer of the friction wear.It can be considered that at this point,the wear resistance of the alloy is mainly influenced by the dispersion strengthening effect of the WC particles.Under the conditions studied in this paper,the alloy with 0.25%WC added has the best wear resistance.
作者
赵玉凤
宋来东
王宏宇
姜银方
胡展铭
ZHAO Yufeng;SONG Laidong;WANG Hongyu;JIANG Yinfang;HU Zhanming(School of Mechanical Engineering,Nantong Institute of Technology,Nantong,226002,China;School of Mechanical Engineering,Jiangsu University,Zhenjiang,212013,China)
出处
《焊接学报》
北大核心
2025年第8期140-146,共7页
Transactions of The China Welding Institution
基金
南通理工学院博士科研启动基金项目(2025XKB02)
南通理工学院科技创新与区域服务团队(KCTD003)
江苏省重点建设学科(苏教研函[2022]2号)。
关键词
铁基形状记忆合金
耐磨机制
激光增材制造
油润滑
WC颗粒
iron-based shape memory alloy
wear resistance mechanism
laser additive manufacturing
oil lubrication
WC particle
