无磁性FeCrMoCBTb非晶钢的形成、硬度及断裂行为  

Study on the Formation,Micro-hardness and Fracture Behavior of the Non-magnetic FeCrMoCBTb Amorphous Steel

作　　者：陶平均[1] 杨元政[1] 毛杰[1] 白晓军[2] 谢至薇[1] 陈先朝[1] 

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]深圳大学材料科学与工程学院,广东深圳518060

出　　处：《铸造技术》2010年第8期977-980,共4页Foundry Technology

基　　金：国家自然科学基金(50971046;50771037;50371020);高等学校博士点专项基金(200805620004);广东省自然科学基金(06021473);广东工业大学博士基金(093046)

摘　　要：通过添加2at.%的稀土元素Tb替代Fe50Cr15Mo14C15B6合金成分中的Fe,采用铜模真空吸铸法制备出直径3～12 mm的一系列Fe48Cr15Mo14C15B6Tb2合金棒,借助X射线衍射仪（XRD）、示差扫描量热仪（DSC）、显微硬度仪及万能试验机,对其玻璃形成能力、热稳定性、显微硬度、应力应变及断裂行为进行研究.结果表明,添加2 at.%的稀土Tb能显著提高合金的玻璃形成能力,其最大尺寸可达10 mm以上;合金的晶化过程为多级晶化行为;显微硬度最高为1 397 HV,最低为1 163 HV,且随合金直径增大而减小;合金压缩断裂前应力-应变具有较好的线性关系,断裂方式为典型的脆性断裂.In the present paper, by substituting rare earth element Tb with a content of 2 at. % for Fe in FesoCr 15Mo 14C 15136 alloy composition, series of Fe48Cr15Mo14C15B6Tb2 alloy rods with diameter ranging from 3 to 12 mm were prepared using the copper mold suction casting. Then the X-ray diffraction （XRD）, differential scanning calorimeter （DSC）, micro hardness tester and universal testing machine were adopted to study the glass forming abilities, thermal stabilities, hardness, and deformation fracture behavior. The results showed that the addition of rare earth Tb could significantly improve the glass forming ability, and the maximum diameter of the amorphous alloy rods up to 10mm or more could be obtained. The amorphous alloy＇s crystallization process exhibited multi-stage crystallization behavior. The highest and lowest micro-hardness was 1 397 Hv and 1 163 Hv, respectively. With increasing diameter, the micro-hardness value dropped gradually. Under compression, the amorphous alloys showed brittle nature, and the fracture mode was a typically brittle fracture.

关 键 词：非晶钢 稀土元素Tb 玻璃形成能力 显微硬度 脆性断裂 

分 类 号：TG139.8[一般工业技术—材料科学与工程]