Influence of Process and Heat Treatment on the Microstructur

发布时间：2020-12-07 15:05

　　增材制造,又称3D打印技术,深刻地改变了零部件成型方式。本文对比了两种工艺EBM和SLM焊接Ti-6Al-4V合金,并详细研究了其对材料微观结构和力学性能的影响。另外,本文还讨论了两种热处理对材料特性的影响:热均压法（HIP）和退火。同时使用了电子背散射衍射（EBSD）和X射线衍射对材料的微观结构进行表征,结果显示EBM带来了α层片中β残留,而SLM产生了马氏体α’结构。热处理都使得材料的刚度和韧性得到提升。EBM样本HIP处理后极限拉伸强度（UTS）提升了21%。然而SLM样本退火后极限拉伸强度下降了20%,这主要由于从马氏体α’转变为lamellarα+β带来的微观结构的改变。 

【文章来源】：上海交通大学上海市 211工程院校 985工程院校 教育部直属院校

【文章页数】：62 页

【学位级别】：硕士

【文章目录】：
Abstract
摘要
1.Introduction
    1.1.Introduction to Additive Manufacturing
        1.1.1.Electron Beam Melting
        1.1.2.Selective Laser Melting
    1.2.Ti-6Al-4V:Interesting Properties for Additive Manufacturing
2.Experiments
    2.1.EBSD:Method and Protocol
        2.1.1.Introduction to EBSD
        2.1.2.Experimental Protocol and Parameters
        2.1.3.EBSD Data analysis with OIM 7
    2.2.X-Ray Diffraction:Method and Protocol
        2.2.1.Introduction to Synchrotron Radiation
        2.2.2.Experimental Protocol and Parameters
        2.2.3.XRD data Treatment:From a2D Pattern to a peaks identification
3.Results and Discussion
    3.1.Identification of the Microstructure
        3.1.1.Microscopy:Picturing the phases with grain maps
        3.1.2.XRD Identification of the different phases
        3.1.3.Discussion about the Microstructure: α, α’andβ peaks
    3.2.Analysis of the mechanical properties
        3.2.1.Adapting the Data Spreading
        3.2.2.Analysis of the Ductility
        3.2.3.Analysis of the Stiffness:Young’s Modulus calculation
        3.2.4.Tensile properties:UTS and Fracture Stress
Conclusion
Acknowledgements
Appendix
    Control Sample Data
    Fit2D Analysis Parameters
    Initial State2D Pattern from XRD
    OIM Grain Size Analysis
    XRD data:Calculation of the Young Modulus,Poisson ratio
    XRD Data:Intensity for each identified Diffracted Peaks
References



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