Fe51Mn30Cr19低活化双相多主元合金中χ相与M23C6碳化物在475℃回火过程中的析出行为  

Precipitation behavior of χ phase and M23C6 carbide in low-activation duplex multi-principal element alloy Fe51Mn30Cr19 during tempering at 475 ℃

作　　者：曹伟涛 郑明杰[1] 丁文艺[1] 王超[1] 信敬平[1] Cao Weitao;Zheng Mingjie;Ding Wenyi;Wang Chao;Xin Jingping(Key Laboratory of Neutronics and Radiation Safety,Institute of Nuclear Energy Safety Technology,Chinese Academy of Sciences,Hefei Anhui 230031,China;University of Science and Technology of China,Science Island Branch of Graduate School,Hefei Anhui 230027,China;School of Physics and Electronics Information Engineering,Henan Polytechnic University,Jiaozuo Henan 454000,China)

机构地区：[1]中国科学院核能安全技术研究所,中子输运理论与辐射安全重点是实验室,安徽合肥230031 [2]中国科学技术大学研究生院科学岛分院,安徽合肥230027 [3]河南理工大学物理与电子信息学院,河南焦作454000

出　　处：《金属热处理》2020年第6期98-103,共6页Heat Treatment of Metals

基　　金：国家自然科学基金(11675209);安徽省重点攻关计划面上项目(1704A0902021);合肥物质科学技术中心创新项目培育基金(2018CXFX011)。

摘　　要：通过XRD、SEM、EBSD和TEM等手段研究了低活化双相多主元合金Fe51Mn30Cr19在475℃回火过程中χ相与M23C6的析出行为。结果表明,试验材料在回火过程中χ相与M23C6碳化物析出行为既有相似性又存在差异性。两种析出相的相似性是χ相与其基体铁素体相和M23C6与其基体奥氏体相都满足立方-立方位向关系,且析出相与基体晶格常数比值都十分接近3∶1。两种析出相在回火过程中差异性在于χ相首先以点状析出相形式于铁素体内部产生,析出过程不存在元素偏聚,而M23C6的析出总起始于铁素体/奥氏体界面,然后逐渐向铁素体区域扩展,析出过程存在明显的铬元素偏聚。根据两种析出相晶格结构并与其母相对比,分析了两种析出相的形成机理。通过对低活化双相多主元合金析出特征的分析,能够为析出相的控制与材料性能设计提供重要的参考依据。The precipitation behavior ofχphase and M23C6 carbide in low-activation duplex phase multi-principal element alloy Fe51Mn30Cr19 after tempering at 475℃were studied by means of XRD,SEM,EBSD and TEM.The result shows that,after tempering,the precipitation behavior ofχphase and M23C6 carbide in the test materials exists similarities as well as differences.The similarities of the two precipitates are both exhibited the same cubic-cubic orientation relationship with its matrix,and the ratio of lattice constant of the precipitates and matrix is very close to 3∶1.However,the differences of the two precipitates are thatχphase is first precipitated inside the ferrite in the form of a dot-like,and there is no element segregation in the precipitation process,but the M23C6 phase always begins to precipitate at the interface of ferrite/austenite,and then gradually to expand into the ferrite region,which has a significant segregation of chromium.Based on the lattice structure of the two precipitations and their relationship with their parent phase,the formation mechanism of the two precipitations is also analyzed.Through the analysis of these characteristics of low-activation duplex phase multi-principal element alloy,it can provide an important reference for the control of the precipitated phase and the design of material properties.

关 键 词：多主元合金 低活化 χ相 M23C6碳化物 位向关系 

分 类 号：TG142[一般工业技术—材料科学与工程]