以Ti、Al、V混合元素粉末为原料激光沉积Ti-6Al-4V,并对沉积态试样的组织演化及力学性能进行研究.结果表明,与采用预合金Ti-6Al-4V粉末为原料所获得的沉积试样的凝固组织特征有所不同,采用混合元素粉末为原料获得的沉积试样的凝固组织随激光功率的提高逐渐由等轴晶转化为柱状晶,熔池内合金化过程所产生的混合热的扰动作用是导致低功率条件下等轴晶形成的原因.原始β晶粒内的微观组织由大量的魏氏α板条和一定体积分数的板条间β相组成.这与采用预合金粉末基本相同.混合元素法激光立体成形Ti-6Al-4V的氧含量仅约0.1wt.%,沉积态Ti-6Al-4V的室温拉伸性能超过锻件标准要求.
The microstructure and mechanical properties of laser solid formed Ti-6AI-4V from the blend of Ti, Al, and V powders were investigated. It is found that the macrostructure changes from equiaxed to columnar grains with the increase of the laser power, which is very different from that of the samples using pre-alioyed powders as cladding materials. The disturbance effect of the mixing enthalpy during laser deposition is considered responsible for the formation of equiaxed grains at low laser powers. The microstructure within prior-β grains mainly consists of Widmanstatten a laths separated by β-Ti, which is basically identical to those from pre-alloyed powders. Oxygen content of as-deposited samples was measured and the tensile testing was carried out. The results show that the oxygen content of as-deposited Ti-6Al-4V from blended elemental powders is only about 0.1wt.% and the mechanical properties are comparable to or even better than that of conventionally wrought material.
参考文献
| [1] | 黄卫东;林鑫;陈静.激光立体成形[M].Xi' an:Northwestern Polytechnicai University Press,2007:1. |
| [2] | Kobryn P.A.;Moore E.H. .THE EFFECT OF LASER POWER AND TRAVERSE SPEED ON MICROSTRUCTURE, POROSITY, AND BUILD HEIGHT IN LASER-DEPOSITED Ti-6A1-4V[J].Scripta materialia,2000(4):299-305. |
| [3] | Qian L;Mei J;Liang J et al.[J].Journal of Materials Science and Technology,2005,21:597. |
| [4] | Kelly S M;Kampe S L .[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2004,35:1861. |
| [5] | Kelly S M;Kampe S L .[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2004,35:1869. |
| [6] | 薛雷;陈静;张凤英 et al.[J].稀有金属材料与工程,2006,35(11):1817. |
| [7] | Collins PC.;Banerjee R.;Banerjee S.;Fraser HL. .Laser deposition of compositionally graded titanium-vanadium and titanium-molybdenum alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):118-128. |
| [8] | Banerjee R;Collins P C;Bhattacharyya D et al.[J].Acta Materialia,2003,51:3277. |
| [9] | Genc A;Banerjee R;Hill D et al.[J].Materials Letters,2006,60:859. |
| [10] | Nag S;Banerjee R;Fraser HL .A novel combinatorial approach for understanding microstructural evolution and its relationship to mechanical properties in metallic biomaterials.[J].Acta biomaterialia,2007(3):369-376. |
| [11] | Banerjee R;Bhattaeharyya D;Collins P C et al.[J].Acta Materialia,2004,52:377. |
| [12] | Banerjee R;Nag S;Fraser H L .[J].Materials Science and Engineering C:Biomimetic and Supramolecular Systems,2005,25:282. |
| [13] | 张霜银,林鑫,陈静,张凤英,黄卫东.工艺参数对激光快速成形TC4钛合金组织及成形质量的影响[J].稀有金属材料与工程,2007(10):1839-1843. |
| [14] | Lin X;Yue T M;Yang H O et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2005,391:325. |
| [15] | Tan Hun;Chen Jing;Lin Xin et al.[J].Materials Science Forum,2007,546-549:2301. |
| [16] | 张邦维.嵌入原子方法理论及其在材料科学中的应用:原子尺度材料设计理论[M].长沙:湖南大学出版社,2003 |
| [17] | 张霜银,林鑫,陈静,黄卫东.热处理对激光成形TC4合金组织及性能的影响[J].稀有金属材料与工程,2007(07):1263-1266. |
| [18] | 陶春虎;刘庆瑔;曹春晓.航空用钛合金的失效及其预防[M].北京:国防工业出版社,2002 |
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