临界退火温度对含铝热轧中锰钢滑动摩擦性能的影响  

Effect of Inter-Critical Annealing Temperature on the Sliding Tribological Properties of Hot-Rolled Al-Contained Medium Manganese Steel

作　　者：毛沛宁 黄兴民[1] 纪秀林 张娟[3] 石宇 MAO Peining;HUANG Xingmin;JI Xiulin;ZHANG Juan;SHI Yu(Key Laboratory of Advanced Technologies of Materials,Ministry of Education,School of Materials Science and Engineering,Southwest Jiaotong University,Sichuan Chengdu 610031,China;Department of Mechanical Engineering,Shantou University,Guangdong Shantou 515063,China;Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province,School of Mechanics and Engineering,Southwest Jiaotong University,Sichuan Chengdu 610031,China)

机构地区：[1]西南交通大学材料科学与工程学院,四川成都610031 [2]汕头大学工学院机械工程系,广东汕头515063 [3]西南交通大学力学与航空航天学院应用力学与结构安全重点实验室,四川成都610031

出　　处：《摩擦学学报(中英文)》2024年第12期1673-1684,共12页Tribology

基　　金：国家自然科学基金项目(12272325)资助。

摘　　要：典型的耐磨高锰钢在低应力摩擦条件下加工硬化能力欠缺,相应工况下耐磨性能并不理想.中锰钢因成型工艺简单,成本较低,在耐磨钢领域有巨大的潜力.为发掘中锰钢在滑动条件下的摩擦学性能优势,着重分析退火温度对Fe-5Mn-3.2Al-0.35C热轧耐磨中锰钢(名义成分,质量分数,简称5MnAl)组织结构和滑动耐磨性的影响.热轧淬火5MnAl钢为全马氏体组织,经650℃退火后获得铁素体和碳化物的混合组织;超过700℃临界退火导致马氏体逆相变为奥氏体和铁素体,残留奥氏体含量随退火温度的升高先增加后略有下降.相比于市售耐磨中锰钢,退火态5MnAl热轧钢在滑动摩擦条件下均具有更低的摩擦系数和磨损率;650℃退火试验钢在10 N载荷下具有最低的磨损率,700℃退火试验钢在20 N载荷下耐磨性约为BTW钢的3.5倍.由于具有显著的高应变硬化率,800℃退火试验钢在大载荷下表现出最低的磨损率.5MnAl中锰钢的磨损机理主要是磨粒磨损、黏着磨损和疲劳磨损.深化新型中锰钢应变硬化机理的理解,必将有利于推动其在耐磨领域的广泛应用.Typical wear-resistant high manganese steel in the low stress friction conditions of the lack of work hardening ability,the corresponding working conditions of wear resistance is not ideal.Medium manganese steels have great potential in the field of wear-resistant steels due to their simple forming process and low cost.To Investigate the tribological performance advantages of medium manganese steel under sliding conditions and optimizing the composition of C,Mn,and Al elements,we developed a wear-resistant hot-rolled medium manganese steel with the nominal composition of Fe-5Mn-3.2Al-0.35C(mass fraction/%),referred to as 5MnAl.This study placed particular emphasis on the influence of annealing temperatures on the microstructure and wear resistance of new-type medium manganese steel.After hot rolling and quenching,5MnAl exhibited a full martensitic structure.Annealing at 650℃results in a mixed structure of ferrite and carbide,while inter-critical annealing at temperatures≥700℃led to a reverse transformation into an austenite and ferrite structure.As the annealing temperature rose,the retained austenite content initially increased and then experiences a slight decrease.Under sliding friction conditions,5MnAl demonstrated superior performance compared to BTW wear-resistant medium manganese steel.At each annealing temperature,it exhibited a lower friction coefficient and wear rate.Notably,5MnAl annealed at 650℃exhibited the lowest wear rate under a 10 N load.Moreover,after annealing at 700℃and testing at a 20 N load,its wear resistance was approximately3.5 times that of BTW steel.At higher loads,5MnAl annealed at 800℃demonstrated the lowest wear rate,owing to its significantly high strain hardening.The primary wear mechanisms observed in medium manganese steel were abrasive wear、adhesive wear and fatigue wear.A deeper understanding of the strain hardening mechanism in medium manganese steel promised to advance its wide-ranging applications in the field of tribology.

关 键 词：中锰钢 临界退火 磨损机理 摩擦学 应变硬化 

分 类 号：TH117.1[机械工程—机械设计及理论] TG174.44[金属学及工艺—金属表面处理]