利用XRD,TEM研究了渗氢后Ti6Al4V合金的组织变化.在渗氢0.302%(质量分数,下同)及0.490%的试样中发现了面心立方的氢化物δ和大量的斜方结构的马氏体α".提出了1种基于扩散的由βH共析转变生成α及fcc结构的片状氢化物δ的机制,并指出氢的引入可能诱发马氏体转变.在室温拉伸试验中发现在氢含量不高于0.102%时不发生氢致脆化.氢化物δ和马氏体α"在Ti6Al4V合金的氢脆中起主要作用,氢化物δ既有利于裂纹的萌生又有利于裂纹的扩展,而马氏体α"对裂纹的扩展具有重要的作用,二者共同促进了Ti6Al4V合金的室温高氢含量氢脆.
参考文献
| [1] | Nakahigashi J;Yoshimura H .Ultra-Fine Grain Refinement and Tensile Properties of Titanium Alloys Obtained through Protium Teatment[J].Journal of Alloys and Compounds,2002,330～332:384-388. |
| [2] | D. Eliezer;N. Eliaz;O. N. Senkov;F. H. Froes .Positive effects of hydrogen in metals[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2000(1):220-224. |
| [3] | Zhang Shaoqing;Zhao Linruo .Effect of Hydrogen on the Superplasticity and Microstructure of Ti-6Al-4V Alloys[J].Journal of Alloys and Compounds,1995,218:233-236. |
| [4] | Shih D S;Birnbaum H K .Evidence of fcc Titanium Hydride Formation in β Titanium Alloy:An X-Ray Diffraction Study[J].Scripta Metallurgica et Materialia,1986,20:1261-1264. |
| [5] | Gu J;Hardie D .Effect of Hydrogen on Structure and Slow Strain Rate Embrittlement of Mill Annealed Ti6Al4V[J].Materials Science and Technology,1996,12:802-807. |
| [6] | 何晓,沈保罗,曹建玲,邱绍宇,邹红.氢对两种新型钛合金强度和塑性的影响[J].稀有金属材料与工程,2003(05):390-393. |
| [7] | Qazi J I;Senkov O N;Rahim J et al.Phase Transformation in Ti-6Al-4V-xH Alloys[J].Metallurgical and Materials Transactions,2001,32A:2453-2463. |
| [8] | Xiao H Z .On the Mechanism of Hydride Formation in a-Ti Alloys[J].Scripta Metallurgica et Materialia,1992,27:571-576. |
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