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| ZTC4钛合金铸件组织晶粒度测定及评估方法研究 |
| Study on the Determination and Assessment of Grain Size for ZTC4 Titanium Alloy Castings |
| Received:April 19, 2018 Revised:May 10, 2018 |
| DOI：10.3969/j.issn.1674-6457.2018.03.020 |
| 中文关键词: 钛合金 铸件 组织 统计 晶粒度 |
| 英文关键词: titanium alloy casting microstructure statistics grain size |
| 基金项目:工信部民用飞机专项科研技术项目（MJZ-2014-G-25） |
| Author Name | Affiliation | | WU Guo-qing | School of material science and Engineering, Beihang University, Beijing 100191, China | | QIE Xi-wang | AECC Beijing Institute of Aeronautical Materials, Beijing 100191, China | | WEN Fu-hua | China Linyi High-tech Zone Shuanghang Material Technology Co., Ltd., Linyi 276000, China | | ZHAO Wen-zheng | School of material science and Engineering, Beihang University, Beijing 100191, China | | LI Shi-hao | School of material science and Engineering, Beihang University, Beijing 100191, China | | NAN Hai | AECC Beijing Institute of Aeronautical Materials, Beijing 100191, China |
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| 中文摘要: |
| 目的 针对大型复杂精密钛合金铸件等飞机关键结构件组织和性能的评估，提出了一种ZTC4钛合金铸件组织晶粒度的评估及分析方法。方法 通过对各类钛合金典型铸件的结构复杂性、凝固过程等关键因素进行分析，对铸件组织随机取样、试样制备与试样显示、试样检验、图像自动拼接、晶界描绘、图像处理测量和数据统计分析的组织定量表征方法。结果 确定铸件在取样过程中需要关注的重要因素，如壁面厚度变化、筋板的交接状态、铸型的种类以及浇冒口位置等，建立了反映铸件上性能的取样原则，建立了基于像素统计的组织定量表征方法，涵盖了晶粒最大尺寸、最小尺寸、平均尺寸和晶粒不规则度等指标。结论 该方法可以真实、准确、定量地反映钛合金铸件的显微组织特征，为钛合金铸件的综合评估提供基础数据支撑。 |
| 英文摘要: |
| This paper aims at assessment on structure and performance of key structural components such as large complex precision titanium alloy for airplane and to present a method to assess and analyze grain size for ZTC4 titanium alloy castings. Through analyzing key factors such as structural complexity, solidification process, etc. in titanium alloy castings, microstructure quantitative characterization methods, including random sampling, sample preparation and sample display, sample inspection, automatic image mosaic, grain boundary description, image measurement and statistical analysis were established. The casting thickness, rib plate, cast type and casting head position were considered as key factors needing attention in the sampling process. Sampling principles reflecting casting properties were established. Quantitative characterization methods based on pixel statistics were established, covering the maximum grain size, minimum size, average size, and grain irregularity. This method can truly, accurately and quantitatively reflect microstructure characteristics of titanium alloy castings and provide basic data support for comprehensive evaluation of titanium alloy castings. |
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