研究喷丸强化对高强铝合金7A12高周疲劳性能的影响.利用透射电镜(TEM)和扫描电镜(SEM)观察喷丸和未喷丸状态的微观组织和断口形貌,利用X射线(XRD)分析强化层残余应力分布情况.结果表明:喷丸强化使7A12铝合金疲劳强度提高了26％.喷丸强化可在材料表面引入残余压应力,并显著细化表层晶粒(形成亚晶)和实现位错增殖,且沿层深呈梯度变化特征.喷丸强化引起7A12铝合金疲劳强度提高可归因于喷丸造成的晶粒细化和位错增殖对疲劳裂纹萌生的有效抑制,以及喷丸引入的表面残余压应力对疲劳裂纹早期扩展的有效阻止作用.疲劳试样断口形貌证实喷丸强化后试样的疲劳裂纹扩展速率明显低于原始状态.
参考文献
| [1] | 汝继刚,伊琳娜.高纯化对Al-Zn-Mg-Cu系高强铝合金性能的影响[J].航空材料学报,2003(z1):5-7. |
| [2] | 陈亚莉.铝合金在航空领域中的应用[J].有色金属加工,2003(02):11-14,17. |
| [3] | 刘兵,彭超群,王日初,王小锋,李婷婷.大飞机用铝合金的研究现状及展望[J].中国有色金属学报,2010(09):1705-1715. |
| [4] | 汝继刚,伊琳娜.高强铝合金表面强化工艺研究[J].稀有金属,2004(01):182-184. |
| [5] | 高玉魁.喷丸强化对TC4钛合金组织结构的影响[J].稀有金属材料与工程,2010(09):1536-1539. |
| [6] | de Camargo JAM;Cornelis HJ;Cioffi VMOH;Costa MYP .Coating residual stress effects on fatigue performance of 7050-T7451 aluminum alloy[J].Surface & Coatings Technology,2007(24):9448-9455. |
| [7] | H. Y. Miao;D. Demers;S. Larose;C. Perron;Martin Levesque .Experimental study of shot peening and stress peen forming[J].Journal of Materials Processing Technology,2010(15):2089-2102. |
| [8] | Kim, T.;Lee, H.;Hyun, H.C.;Jung, S. .A simple but effective FE model with plastic shot for evaluation of peening residual stress and its experimental validation[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2011(18):5945-5954. |
| [9] | Mylonas, G.I.;Labeas, G. .Numerical modelling of shot peening process and corresponding products: Residual stress, surface roughness and cold work prediction[J].Surface & Coatings Technology,2011(19):4480-4494. |
| [10] | Y. XIANG;Y. LIU .Mechanism modelling of shot peening effect on fatigue life prediction[J].Fatigue & Fracture of Engineering Materials and Structures,2010(2):116-125. |
| [11] | Li, C.;Wan, M.;Wu, X.-D.;Huang, L. .Constitutive equations in creep of 7B04 aluminum alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2010(16/17):3623-3629. |
| [12] | H. Guechichi;L. Castex .Fatigue limits prediction of surface treated materials[J].Journal of Materials Processing Technology,2006(3):381-387. |
| [13] | 张永健,惠卫军,项金钟,董瀚,翁宇庆.晶粒尺寸对42CrMoVNb钢超高周疲劳性能的影响[J].金属学报,2009(07):880-886. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%