不同冲击载荷下10Mn钢和NM500的磨损性能及机理  

Wear properties and mechanism of 10Mn steel and NM500 under different impact loads

作　　者：王涛[1,2] 胡锋 张志成[4] 潘先明 陈康彦 吴开明 WANG Tao;HU Feng;ZHANG Zhi-cheng;PAN Xian-ming;CHEN Kang-yan;WU Kai-ming(Collaborative Innovation Center for Advanced Steels,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;International Research Institute for Steel Technology,Wuhan 430081,Hubei,China;Hubei Province Key Laboratory of Systems Science in Metallurgical Process,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Daye Special Steel Co.,Ltd.,Huangshi 435001,Hubei,China;Metals Valley and Band(Foshan)Metallic Composite Co.,Ltd.,Foshan 528000,Guangdong,China)

机构地区：[1]武汉科技大学高性能钢铁材料及其应用省部共建协同创新中心,湖北武汉430081 [2]国际钢铁研究院,湖北武汉430081 [3]武汉科技大学冶金工业过程系统科学湖北省重点实验室,湖北武汉430081 [4]大冶特殊钢有限公司,湖北黄石435001 [5]材谷金带(佛山)金属复合材料有限公司,广东佛山528000

出　　处：《中国冶金》2021年第12期47-54,60,共9页China Metallurgy

基　　金：国家自然科学基金资助项目(U20A20279);武汉市科技计划资助项目(2019010701011382);高等学校学科创新引智计划资助项目(111计划);武汉科技大学科发院重大科技项目(2018TDX07);湖北省“双创战略团队”科技创新项目。

摘　　要：为了给不同类型耐磨钢的实际使用环境提供可靠试验依据,研究不同微观组织的磨损性能和机理,分别在低载荷2 J和高载荷5 J下测试NM500马氏体钢和10Mn奥氏体钢的冲击磨损性能。NM500马氏体耐磨钢以板条状马氏体为主,板条内部存在高密度位错亚结构,同时存在少量残余奥氏体和一些棒状碳化物(TiC);奥氏体10Mn耐磨钢以奥氏体为主,还有少量马氏体和碳化物(NbC、VC)。结果表明,在低冲击载荷(2 J)下,NM500耐磨性高于10Mn钢(160 min的磨损量分别为109和181 mg),归因于NM500比10Mn钢具有更高的硬度,磨料对表面的破坏更小;在高冲击载荷(5 J)下,磨损初期,NM500耐磨性高于10Mn钢(120 min的磨损量分别为140和145 mg),但长时间磨损,NM500耐磨性低于10Mn钢(160 min的磨损量分别为222和173 mg),归因于10Mn钢发生了充分加工硬化,具有更优异的耐磨性。10Mn钢磨损后亚表面微观形貌中存在大量的高密度位错、形变孪晶、应变马氏体,优异的加工硬化能力使10Mn在5 J冲击载荷下更耐磨。Wear properties and mechanisms of different microstructures were studied to provide reliable experimental basis for actual use environment of different types of wear-resistant steel.Impact wear properties of NM500 martensitic steel and 10 Mn austenitic steel were tested under low load of 2 J and high load of 5 J respectively.In NM500 martensitic wear-resistant steel,lath martensite was dominant,and there were high-density dislocation substructures and some rod-shaped carbides(TiC) in the lath;Austenitic 10 Mn wear-resistant steel was mainly composed of austenite,a small amount of martensite and carbide(NbC,VC).The results showed that under low impact load(2 J),the wear resistance of NM500 was higher than that of 10 Mn steel(109 and 181 mg in 160 min,respectively),which was attributed to the higher hardness of NM500 than that of 10 MN steel and the less damage of abrasive to the surface.Under high impact load(5 J),the wear resistance of NM500 was higher than that of 10 Mn steel(140 and 145 mg in 120 min,respectively) at the initial wear stage,but lower than that of 10 Mn steel(222 and 173 mg in 160 min,respectively) after long-term wear,which was attributed to the full work hardening of 10 Mn steel and better wear resistance.There were a lot of high-density dislocations,deformation twins and strain martensite in the worn sub surface microstructure of 10 Mn steel.The excellent work hardening ability makes 10 Mn steel more wear-resistant under 5 J impact load.

关 键 词：耐磨钢 奥氏体 马氏体 加工硬化 冲击磨料磨损 

分 类 号：TG142.72[一般工业技术—材料科学与工程]