摘要
本文中采用电弧熔炼和感应熔炼后喷铸的方法制备了厚度为4 mm的Fe基块体非晶合金.通过对Fe_(41)Co_(7)Cr_(15)Mo_(14)C_(15)B_(6)Y_(2)块体非晶合金进行30次和60次冷热循环处理,并在往复式摩擦磨损条件下,研究冷热循环工艺对其摩擦磨损性能的影响.结果表明:冷热循环处理没有显著改变铁基非晶合金的非晶态结构.30次冷热循环处理后,Fe基块体非晶合金发生了明显的软化,平均硬度由铸态的16.06 GPa降为14.06 GPa,平均弹性模量由241 GPa降为216 GPa.随着冷热循环次数和载荷的增加,非晶合金的平均摩擦系数和磨损率先减小后增大.冷热循环处理有利于降低非晶合金的平均摩擦系数和磨损量.当冷热循环次数为30次、载荷为30 N时,铁基非晶的摩擦系数由0.77降至0.72,表现出最小的摩擦系数,同时磨损率降低13.3%,表现出最小的磨损率[1.04×10^(−6) mm^(3)/(m·N)].铸态Fe基块体非晶合金的磨损机理以疲劳断裂为主,伴随着轻微的磨粒磨损.随着冷热循环次数的增加,疲劳导致的脆性断裂程度降低,磨损机制向磨粒磨损和疲劳断裂的共同作用转变.所以,冷热循环处理有望成为调控非晶态金属材料摩擦学性能的有效手段.进一步深化对冷热循环处理的理解,必将有利于推动非晶态材料在摩擦学领域的应用.
In many amorphous alloy systems,Fe-based amorphous alloy has been considered as a wear-resistant material due to its relatively low raw material cost,outstanding high hardness,and unique wear resistance and anti-corrosion,showing broad development prospects.However,intrinsic brittleness restricts its potential structural engineering application.Recently,a new process called deep cryogenic cycling treatment(DCT)has been applied as a simple method to improve the plasticity and toughness of bulk amorphous alloys.But there are few reports about the DCT of Fe-based bulk amorphous alloys.Moreover,the effect of the thermal cycling treatment on the tribological properties of amorphous alloys is not clear.Therefore,in this study,Fe-based bulk amorphous alloy Fe_(41)Co_(7)Cr_(15)Mo_(14)C_(15)B_(6)Y_(2) was prepared using arc melting and copper mold injecting-casting to fabricate amorphous rods.Then the as-cast FeCoCrMoCBY amorphous alloy rod was prepared for processing by the cryogenic-thermal cycling treatment.FeCoCrMoCBY bulk amorphous alloy was cryogenic-thermal treated by 30 and 60 cycles,respectively.After comparing with the as-cast FeCoCrMoCBY amorphous alloy,the effects of cryogenic-thermal cycling treatment on the microstructure,wear resistance and wear mechanism of Fe-based bulk amorphous alloys were studied in order to further promote the tribological performance of amorphous materials and coatings.The effect of cryogenic-thermal cycling process on the friction and wear performance was investigated through the reciprocating friction and wear experiment on CFT-I seawater environment friction and wear test system.The XRD patterns showed that there was no detectable structure evolution of the Fe-based amorphous alloy after the cryogenic-thermal cycling treatment.And the cryogenic-thermal cycling treatment had little influence on the thermal stability of FeCoCrMoCBY amorphous alloy on account of nearly the same glass transition temperature(T_(g))and crystallization temperature(T_(x)).By the nanoindentation tests,the
作者
靳娟
纪秀林
段峻
刘增辉
王辉
张映桃
JIN Juan;JI Xiulin;DUAN Jun;LIU Zenghui;WANG Hui;ZHANG Yingtao(School of Mechanical and Electrical Engineering,Hohai University,Jiangsu Changzhou 213022,China;Department of Mechanical Engineering,Shantou University,Guangdong Shantou 515063,China)
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2022年第4期690-699,共10页
Tribology
基金
国家自然科学基金项目(51875169,51905148)资助。
关键词
非晶合金
冷热循环
磨损机理
摩擦学
金属玻璃
amorphous alloy
cryogenic-thermal cycle
wear mechanism
tribology
metallic glass
