β退火对TC4-xFe力学性能影响的研究任务书
2020-05-15 22:25:52
1. 毕业设计（论文）的内容和要求
钛及钛合金具有高比强度、低弹性模量、强耐腐蚀性、低膨胀系数、低热导率以及环境友好等优势，经常被用于航空航天、生物医疗以及海洋船舶等领域。tc4钛合金凭借其良好的综合力学性能，目前仍是世界范围内使用最为广泛的钛合金材料（约占钛材消费量的50%）。但tc4合金也拥有诸多缺点，合金的抗拉强度相对较低，难以胜任高强度构件的要求；同时合金高温塑性变形加工时所受流变抗力较大，热加工性能较差。通过向tc4钛合金中添加少量的低成本元素fe，在保证合金优良塑韧性的前提下，提高合金的强度以满足构件对强度的要求，同时fe元素的添加降低了tc4合金热加工过程中的流变抗力，改善了合金的热加工性。β退火一般是先在合金β转变温度以上10~50℃保温一段时间，以完成α相向β相的完全转变；然后在较低温度下再保温一段时间以获得稳定态组织，最终得到断裂韧性、强度和塑韧性匹配良好的构件。本课题主要研究β退火对tc4-xfe合金力学性能的影响规律，探讨不同fe含量对合金力学性能的演变过程，通过对合金断口形貌的观察分析，确定试样的断裂行为方式，为今后的应用提供理论依据。
本次论文的内容为：
（1） 查阅中外文资料15篇以上，了解tc4合金的力学性能指标和β退火对合金力学性能的影响规律，撰写开题报告。
2. 参考文献
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1. Guo P, Zhao Y, Zeng W, et al. The effect of microstructure on the mechanical properties of TC4-DT titanium alloys[J]. Materials Science amp; Engineering A, 2013, 563(2):106-111. 2. Peng X, Guo H, Wang T, et al. Effects of β treatments on microstructures and mechanical properties of TC4-DT titanium alloy[J]. Materials Science amp; Engineering A, 2012, 533:55-63. 3. Du Z X, Xiao S L, Shen Y P, et al. Effect of hot rolling and heat treatment on microstructure and tensile properties of high strength beta titanium alloy sheets[J]. Materials Science amp; Engineering A, 2015, 631:67-74. 4. Zhang A, Liu D, Wu X, et al. Effect of heat treatment on microstructure and mechanical properties of laser deposited Ti60A alloy[J]. Journal of Alloys amp; Compounds, 2014, 585(3):220-228. 5. Tian X J, Zhang S Q, Wang H M. The influences of anneal temperature and cooling rate on microstructure and tensile properties of laser deposited Ti#8211;4Al#8211;1.5Mn titanium alloy[J]. Journal of Alloys amp; Compounds, 2014, 608(5):95-101. 6. Peng X N, Guo H Z, Shi Z F, et al. Microstructure characterization and mechanical properties of TC4-DT titanium alloy after thermomechanical treatment[J]. Transactions of Nonferrous Metals Society of China, 2014, 24(3):682-689. 7. Jin Y K, Park K T, Shim I O, et al. Globularization Behavior of ELI Grade Ti6Al4V Alloy during Non-Isothermal Multi-Step Forging[J]. Materials Transactions, 2008, 49(1):215-223. 8. Nalla R K, Boyce B L, Campbell J P, et al. Influence of microstructure on high-cycle fatigue of Ti-6Al-4V: Bimodal vs. lamellar structures[J]. Metallurgical amp; Materials Transactions A, 2002, 33(13):899-918. 9. Sun L P, Lin G Y, Liu J, et al. Effect of low temperature thermo-mechanical treatment on microstructures and mechanical properties of TC4 alloy[J]. Journal of Central South University of Technology, 2010, 17(3):443-448. 10. Zhang S Y, Lin X, Chen J, et al. Effect of solution temperature and cooling rate on microstructure and mechanical properties of laser solid forming Ti-6Al-4V alloy[J]. Chinese Optics Letters, 2009(06):498-501. 11. 樊亚军, 曹继敏, 杨华斌,等. Fe含量对Ti-6Al-4V钛合金力学性能的影响[J]. 金属热处理, 2013, 38(3):21-23. 12. Influence of Fe content and particle size the on the processing and mechanical properties of low-cost Ti-xFe alloys[J]. Materials Science amp; Engineering A, 2010, 527(21):5664-5669. 13. Wang Z, Cai H, Hui S. Microstructure and mechanical properties of a novel Ti-Al-Cr-Fe titanium alloy after solution treatment[J]. Journal of Alloys amp; Compounds, 2015, 640:253-259. 14. 陈学伟, 张士宏, 王忠堂,等. 热处理工艺对TC11钛合金组织及性能的影响[J]. 金属热处理, 2007, 32(10):48-51. 15. 罗锦华, 朱燕丽, 侯峰起,等. 热处理温度对TC20钛合金细晶棒材组织和性能的影响[J]. 钛工业进展, 2015, 32(3):17-20. 16. Jovanovi#263; M T, Tadi#263; S, Zec S, et al. The effect of annealing temperatures and cooling rates on microstructure and mechanical properties of investment cast Ti-6Al-4V alloy[J]. Materials amp; Design, 2006, 27(3):192-199. 17. 刘睿, 惠松骁, 叶文君,等. 退火温度对TC4钛合金动态断裂韧性的影响[J]. 稀有金属材料与工程, 2011, 40(10):1799-1803. |
3. 毕业设计（论文）进程安排
2016.1.6~2016.1.16查阅中外文资料，翻译外文资料,参加讨论
2016.2.22~2016.3.6撰写开题报告,参加开题答辩
2016.3.7~2016.3.16制定研究方案，熟悉仪器,参加讨论
