为研究激光喷丸强化对7075－T6铝合金半圆孔件疲劳寿命的影响，对激光喷丸与未喷丸的试样进行了对比试验，利用X射线应力仪测定其表面残余应力，并对试样进行疲劳拉伸试验．用扫描电镜观察了两类试样疲劳断口的形貌，并采用数理统计方法对其疲劳寿命进行分析．研究表明：经激光喷丸处理区域，表面存在较大的残余压应力，幅值为310 MPa；未喷丸试样疲劳裂纹条带的宽度为0．7～0．8μm，而喷丸试样疲劳裂纹条带的宽度为0．3～0．4μm，说明喷丸试样裂纹扩展的速度比未喷丸试样慢很多；激光喷丸后半圆孔件的疲劳寿命比未喷丸的疲劳寿命提高了2．8～7．2倍．
In order to investigate the effect of laser shot peening on fatigue life of 7075-T6 Al alloy specimen with a semicircle hole, the comparative tests were conducted between the laser?peened specimen and the un?peened specimen. The surface residual stresses were measured with model X-350A of X?ray diffraction stress analyzer and fatigue tests were carried out. The fatigue fracture morphology of two kinds of specimens were observed with the model JSM-7001F of scanning electron microscope, and the fatigue life was comprehensively studied by statistical analysis. The results show that the laser shot peening can induce the residual compressive stress in laser?peened zone, and its magnitude reaches to 310 MPa. The spacing of the fatigue striations in un?peened specimen is roughly 0.7~0.8μm, while the spacing of the fatigue striations in peened specimen is only 0.3~0.4 μm, which indicates that the crack propagation rate of the peened sample is slower than that of the un?peened case. The average fatigue life of the laser?peened specimen is 2.8~7.2 times than that of the un?peened specimen.
参考文献
| [1] | 任旭东,张永康,周建忠,顾永玉,张新权.激光冲击工艺对钛合金疲劳寿命的影响[J].中国有色金属学报,2007(09):1486-1489. |
| [2] | 张兴权,何广德,汪世益,戚晓利,邓克.激光喷丸强化对调质40Cr钢组织及耐磨性的影响[J].材料热处理学报,2011(05):138-142. |
| [3] | 周建忠,左立党,黄舒,徐增闯,杨晶,季杏露,谢小江.基于应变速率的激光喷丸强化6061-T6铝合金力学性能分析[J].中国激光,2012(05):101-106. |
| [4] | HOU Li-feng,WEI Ying-hui,LIU Bao-sheng,XU Bing-she.Microstructure evolution ofAZ91D induced by high energy shot peening[J].中国有色金属学会会刊（英文版）,2008(05):1053-1057. |
| [5] | GRAHAM Hammersley;HACKEL Lloyd A;FRITZ Harries.Surface Prestressing to improve fatigue strength of component by laser shot peening[J].Optics and Laser in Engineering,2000:34,327-337. |
| [6] | J.-M. Yang;Y. C. Her;Nanlin Han;Alan Clauer .Laser shock peening on fatigue behavior of 2024-T3 Al alloy with fastener holes and stopholes[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2001(1/2):296-299. |
| [7] | 曹子文,车志刚,邹世坤,赵勇.激光冲击强化对7050铝合金紧固孔疲劳性能的影响[J].应用激光,2013(03):259-262. |
| [8] | 张兴权,张永康,顾永玉,周建忠,王菁.激光喷丸诱导的残余应力的有限元分析[J].塑性工程学报,2008(04):188-193. |
| [9] | PEYRE P;FABBRO R;MERRIEN P et al.Lasershock processing of Al alloys. Application to high cycle fatigue behavior[J].Materials Science and Engineering A,1996,210:102-113. |
| [10] | 任旭东,张永康,周建忠,张兴权,鲁金忠.激光参数对Ti6Al4V钛合金激光冲击成形的影响[J].中国有色金属学报,2006(11):1850-1854. |
| [11] | S. Huang;J. Z. Zhou;J. Sheng;K. Y. Luo;J. Z. Lu;Z. C. Xu;X. K. Meng;L. Dai;L. D. Zuo;H. Y. Ruan;H. S. Chen.Effects of laser peening with different coverage areas on fatigue crack growth properties of 6061-T6 aluminum alloy[J].International Journal of Fatigue,2013:292-299. |
| [12] | 刘新灵;张峥;陶春虎.疲劳断口定量分析[M].北京:国防工业出版社,2010 |
| [13] | J.Z. Lu;K.Y. Luo;Y.K. Zhang .Grain refinement of LY2 aluminum alloy induced by ultra-high plastic strain during multiple laser shock processing impacts[J].Acta materialia,2010(11):3984-3994. |
| [14] | 高镇同.疲劳应用统计学[M].北京:国防工业出版社,1986 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%