基于微束X射线荧光光谱的新型铸&锻GH4096合金涡轮盘成分分布解析  

Analysis of Composition Distribution of New Cast-Forging FGH4096 Alloy Turbine Disk Based on Microbeam X-Ray Fluorescence Spectroscopy

作　　者：彭涯 李冬玲 万卫浩 周晴晴 蔡文毅 李福林[1] 刘庆斌 王海舟 PENG Ya;LI Dong-ling;WAN Wei-hao;ZHOU Qing-qing;CAI Wen-yi;LI Fu-lin;LIU Qing-bin;WANG Hai-zhou(Central Iron&Steel Research Institute,Beijing 100081,China;The NCS Testing Technology Co.,Ltd.,Beijing 100081,China;Beijing Key Laboratory of Metallic Materials Characterization,Beijing 100081,China;University of Science&Technology Beijing,Beijing 100083,China)

机构地区：[1]钢铁研究总院,北京100081 [2]钢研纳克检测技术股份有限公司,北京100081 [3]金属材料表征北京市重点实验室,北京100081 [4]北京科技大学,北京100083

出　　处：《光谱学与光谱分析》2021年第11期3498-3505,共8页Spectroscopy and Spectral Analysis

基　　金：国家重点研发计划材料基于材料基因工程关键技术与支撑平台重点专项(2017YFF0106208)资助。

摘　　要：铸&锻GH4096高温合金涡轮盘拥有高承温能力、高强度、低裂纹扩展速率、高抗疲劳性能等优异性能,是航空发动机的关键热端部件。但由于其合金化程度较高、零件尺寸大、制备工艺复杂等,不可避免会出现成分和组织分布不均匀,一定程度影响涡轮盘的服役性能。微区X射线荧光光谱(μ-XRF)具有微区分辨率高、分析速度快、多元素同步分析、非破坏性等优点,被广泛应用于考古、地质、生物等领域,但对大尺寸高温合金构件的成分分布的研究较少,对于材料各原始位置处的成分定量分布表征也未见报道。本试验通过选择合适的测量条件、优化仪器定量方法,建立了基于微束X射线荧光光谱的新型铸&锻GH4096合金涡轮盘成分分布定量分析方法,并引入了原位统计分析方法对涡轮盘中Cr, Co, Mo, W, Ti, Al, Nb和Ni八种主要元素进行了定量统计分布解析。发现涡轮盘厚度的中心区域内Co, Mo和Ti三种元素从轮毂至轮缘存在较明显的弧形负偏析带,而Ni和Cr两种元素存在弧形正偏析带。另外,涡轮盘径向也存在一定的成分梯度分布,Co, Cr和W三种元素含量从轮毂到轮缘的呈现逐渐降低的趋势,而Mo, Ti和Nb三种元素含量则呈现逐渐上升趋势。对各元素最大偏析度、统计偏析度、统计符合度计算分析后可知,Cr, Co, Mo, W, Ti, Nb和Ni七种元素测量区域内整体偏析程度较小、统计符合度大,在材料元素设计值允许范围内具有较好的成分均匀性。使用火花源金属原位分析仪(OPA-200)对相同测试区域的元素进行了线分布分析,其分析结果与微束荧光光谱得到的分析规律具有较好的一致性,说明大尺寸涡轮盘在热处理过程中存在温度场分布,导致了各元素扩散行为以及显微组织分布的差异,因此不同部位的成分也存在一定偏析。通过对大尺寸的涡轮盘成分进行定量统计分布解析,对于评价新型铸&锻�Cast-forging GH4096 superalloy turbine disk is a key hot end component of aero-engine because of its excellent properties such as high temperature bearing capacity, high strength, low crack growth rate, high fatigue resistance and so on. However, due to its high alloying degree, large part size and complex preparation process, it is inevitable that the composition and microstructure distribution will be uneven, which will affect the service performance of the turbine disk to a certain extent. Micro-area X-ray fluorescence spectroscopy(μ-XRF) has the advantages of high micro-resolution, fast analysis speed, simultaneous analysis of multi-elements, non-destructive and so on, so it is widely used in archaeology, geology, biology and other fields. However, there is little research on the composition distribution of large-size superalloy components, and there is no report on the quantitative distribution of composition at the original location of the material. In this experiment, by selecting suitable measuring conditions and optimizing instrument quantitative method, a new quantitative analysis method of composition distribution of cast-forging GH4096 alloy turbine disk based on microbeam X-ray fluorescence spectroscopy was established, and the in-situ statistical analysis method was introduced to analyze the quantitative statistical distribution of Cr, Co, Mo, W, Ti, Al, Nb and Ni in turbine disk. It is found that Co, Mo and Ti have obvious arc negative segregation zone from hub to flange in the central region of turbine disk thickness, while Ni and Cr have arc positive segregation zone. In addition, there is also a certain composition gradient distribution in the radial direction of the turbine disk. The contents of Co, Cr and W gradually decrease from the hub to the flange, while the contents of Mo, Ti and Nb show a gradual upward trend. After the calculation and analysis of the maximum segregation degree, statistical segregation degree and statistical fitting degree of each element, it is known that the overall

关 键 词：微束X射线荧光光谱 涡轮盘 原位统计分布分析 偏析 统计符合度 

分 类 号：O657.3[理学—分析化学]