铝热反应法制备的微纳结构304/316L不锈钢的TEM和HRTEM表征

发布时间：2021-08-25 16:10

　　用铝热法制备微纳结构304和316L不锈钢。试样直径120mm,厚度15mm。试样不同变形量轧制再退火之后它的组织演变被研究。分析纳米晶奥氏体的晶粒尺寸和它的体积分数。根据研究结果下列组织演变机制被提出:1.304不锈钢在1000℃下轧制变形40%之后再在700℃下分别轧制变形40%,60%和80%。当变形量不大于60%时,纳米相随变形量的增加而增加。当轧制变形量达到80%时,纳米晶转变为亚微米级和微米晶。轧制变形量为40%,60%和80%时,纳米晶的体积分数分别为21.7%,0.4和8.9%,亚微米晶的体积分数分别为18.7%,24.7%和32.2%。2.304不锈钢经过1000℃-40%-700℃-40%轧制后,再经800℃退火1h和8h结果表明随着退火时间的延长,绝大部分的纳米晶奥氏体消失,微米晶奥氏体体积分数减小。退火1h和8h后纳米晶的体积分数分别为23.6%、3.1%,亚微米晶的体积分数分别为27.2%和24.7%。当304不锈钢经过1000℃-40%-700℃-60%轧制后,再在800℃退火1h后,纳米晶奥氏体和微米晶奥氏体的体积分数分别为7.3%和38.6%。3.铝热法... 

【文章来源】：兰州理工大学甘肃省

【文章页数】：65 页

【学位级别】：硕士

【文章目录】：
摘要
Abstract
Chapter 1 Introduction
    1.1 Bulk nanostructured materials
    1.2 Fabrication of Bulk Nano Crystalline Alloys
        1.2.1 "Bottom-up" Approaches to fabricate bulk nanocrystalline alloy
        1.2.2 "Top-down" Approaches to fabricate bulk nanocrystalline alloy
            1.2.2.1 Cryomilling
            1.2.2.2 Equal-channel angular pressing (ECAP)
        1.2.3 Thermite reaction melting process
    1.3 Deformation mechanisms in bulk nanostructured metals
        1.3.1 Full/partial dislocation emission from grain boundaries
        1.3.2 Deformation twinning
        1.3.3 Grain boundary grain rotation
        1.3.4 Stress-coupled grain boundary migration
    1.4 Microstructure of bulk nanostructured metals
        1.4.1 Dislocation density
        1.4.2 Grain boundary misorientations
    1.5 Characterization of stainless steel
        1.5.1 Transmission electron microscopy (TEM) imaging
        1.5.2 High Resolution Transmission electron microscopy
    1.6 Thesis structure
Chapter 2 Effect of different rolling thickness reduction on Microstructures of Stainless Steel contained of 5%Fe_2O_3 Prepared by Aluminothermic Method
    2.1 Experiment procedure
        2.1.1 Specimen preparation
        2.1.2 Microstructure characterization
    2.2 Experimental Results and Discussion
    2.3 Discussion
    2.4 Summary
Chapter 3 Effect of rolling with different thickness reduction and then followed Annealing with different Time on Microstructures of 304 Stainless Steel Prepared by AluminothermicMethod
    3.1 Experiment procedure
    3.2 Experimental Results
    3.3 Discussion
    3.4 summary
Chapter 4 Effect of different rolling thickness reduction and Annealing Time onMicrostructures of 316L Stainless Steel Prepared by Aluminothermic Method
    4.1 Experiment procedure
    4.2 Experimental Results
    4.3 Discussion
    4.4 Summary
Conclusion
References
Acknowledgements



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