通过正交试验方法研究了放电等离子烧结制备TC4钛合金烧结体工艺中温度、压力和保温时间对其相对密度、硬度和显微组织的影响规律,根据烧结体相对密度和硬度优化了烧结工艺参数.结果表明：温度是影响烧结体性能和显微组织的关键因素,压力和保温时间对其影响较小；随着烧结温度升高,烧结体的相对密度逐渐增大,硬度先增大后减小,晶粒逐渐由等轴状向片层状演变,晶粒尺寸变大；随着压力增大,烧结体的相对密度增大,硬度先增大后减小；随着保温时间延长,烧结体的相对密度和硬度均呈递增的趋势；最优的烧结条件为烧结温度850℃、烧结压力40 MPa、保温时间8 min,此时烧结体的相对密度和硬度均较高,分别为99．09％和42．3 HRC.
An orthogonal approach of experimentation was employed to study the effects of temperature, pressure and holding time on relative density,hardness and microstructure of TC4 titanium alloy sintered compact which were prepared by spark plasma sintering technique.The sintering process parameters were optimized on the basis of the relative density and hardness of the sintered compact.The result show that the sintering temperature was the most essential factor on relative density,hardness and microstructure of the sintered compact,while the pressure and the holding time had less influences.With the increase of sintering temperature,relative density of the sintered compact increased gradually and the hardness firstly increased and then decreased, meanwhile the microstructure gradually changed from equiaxed grain to lamellar structure,and the grain size increased.With the increase of pressure,the relative density of the sintered compact increased and its hardness firstly increased and then decreased.With the increase of holding time,both relative density and hardness increased.The optimal sintering parameters was obtained as follows:temperature of 850 ℃,sintering pressure of 40 MPa,holding time of 8 min.At the parameters,the sintered compact exhibited higher relative density of 99.09% and hardness of 42.3 HRC.
参考文献
| [1] | 田亚强;魏英立;宋进英;陈连生.置氢TC4合金粉末放电等离子烧结制件组织研究[J].热加工工艺,2014(6):29-32,36. |
| [2] | 崔常京;杨璟;陈群志;姚伟;马旭颐.激光焊接对TC4钛合金静强度与疲劳性能的影响[J].机械工程材料,2015(1):90-93. |
| [3] | R.O. Hussein;X. Nie;D.O. Northwood.A spectroscopic and microstructural study of oxide coatings produced on a Ti-6Al-4V alloy by plasma electrolytic oxidation[J].Materials Chemistry and Physics,20121(1):484-492. |
| [4] | 徐鲁杰;程德彬.船用钛合金及钛合金粉末冶金技术[J].材料开发与应用,2009(2):68-70,86. |
| [5] | 喻岚;李益民;邓忠勇;李笃信.粉末冶金钛合金的制备[J].轻金属,2003(9):43-47. |
| [6] | 汤慧萍;黄伯云;刘咏;欧阳洪武.粉末冶金钛合金致密化研究的进展[J].稀有金属材料与工程,2003(9):677-680. |
| [7] | 龙雁;李颖;张红英;邱诚.高能球磨-放电等离子烧结法制备双晶分布钛[J].粉末冶金材料科学与工程,2012(1):76-82. |
| [8] | 夏阳华;丰平;胡耀波;熊惟皓.放电等离子烧结制备Ti（C,N）基金属陶瓷[J].机械工程材料,2004(5):29-31,51. |
| [9] | 白玲;葛昌纯;沈卫平.放电等离子烧结技术[J].粉末冶金技术,2007(3):217-223. |
| [10] | 放电等离子烧结制备碳纳米管块材的低温电输运性能[J].机械工程材料,2011(8):37-39,43. |
| [11] | Gu, Shijia;Zhang, Xin;Wang, Lianjun;Gan, Xuehui;Shen, Zhijian;Jiang, Wan.Direct indication of a higher central temperature achieved during spark plasma sintering process of a zeolite[J].Journal of the European Ceramic Society,20155(5):1599-1603. |
| [12] | 刘哲;曾凡辉;周晓玲;蔡瑞豪.正交实验法优选整体压裂裂缝参数研究[J].重庆科技学院学报（自然科学版）,2013(5):68-71. |
| [13] | 王娟 .放电等离子烧结制备Ti-43Al-9V合金的显微组织及力学性能研究[D].哈尔滨工业大学,2010. |
| [14] | 杨水云;李续娥;吴明宇;孙飞龙;李剑君.正交实验法在PCR反应条件优化中的应用[J].生物数学学报,2005(2):202-206. |
| [15] | 杨鑫 .放电等离子烧结制备钛铝基合金及致密化机理研究[D].中南大学,2012. |
| [16] | 王玉;袁学韬;俞宏英;孙冬柏;李辉勤.脉冲电沉积工艺对镍镀层结构与硬度的影响[J].材料科学与工艺,2010(1):89-95. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%