TiAl合金激光冲击强化工艺探索及强化机制研究
Investigation of Technical and Strengthening Mechanism Research of TiAl Alloy by Laser Shock Peening
查看参考文献17篇
|
文摘
|
主要研究航空常用材料TiAl合金激光冲击强化效果,当激光诱导产生的冲击波大于TiAl合金的动态屈服强度时,材料表面发生塑性变形,并引入大量的位错等晶体缺陷,从而达到表面强化的目的。通过调整激光冲击的次数和激光的能量等因素,得到不同工艺参数下TiAl合金的显微硬度和表面粗糙度。对其微观结构进行透射电镜观察,并与未进行冲击的试样进行对比分析,可以看出激光冲击强化可以有效地提高受冲击表面的位错密度,当位错运动受阻形成位错线的塞积,导致位错缠结;位错受到晶界的阻碍在晶界堆积,形成位错墙,位错墙与位错缠结最终导致亚晶界的形成,为后期晶粒细化做准备,通过分析激光冲击强化机制,揭示了位错密度是材料表面力学性能提高的本质。 |
|
其他语种文摘
|
We have studied the effect of TiAl alloy shocked by the laser shock processing (LSP). When the high amplitude shock waves introduced by high energy laser exceed its dynamic yield strength, the mechanical deformation will occur in the shocked material, which will achieve the aim of surface strengthening. By changing the energy of laser and peening times, we get the results of surface roughness and micro-hardness of the work-piece. The results show that with the improvement of peening times and laser energy,the surface roughness and micro-hardness are increased. The microscopic mechanism of peened materials is also investigated in this paper. Compared with un-peened ones, it can be seen that the laser shock peening can effectively improve surface of the dislocation density. When an obstruction impedes dislocation lines (DLs) motion, which will form dislocation tangles (DTs). Accumulation of dislocations is hampered by grain boundary, and forms dislocation walls (DDWs). The transformation of DTs and DDWs into sub-grain boundaries can prepare for grain refinement. The analysis of the mechanism is introduced by laser shock processing,which reveales that dislocation density is the essence of material surface mechanical properties. |
|
来源
|
中国激光
,2014,41(10):1003013-1-1003013-6 【核心库】
|
|
关键词
|
激光光学
;
TiAl合金
;
激光冲击强化
;
组织性能
|
|
地址
|
中国科学院沈阳自动化研究所, 辽宁, 沈阳, 110176
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
0258-7025 |
|
学科
|
电子技术、通信技术 |
|
文献收藏号
|
CSCD:5282826
|
参考文献 共
17
共1页
|
|
1.
Wu X H. Review of alloy and process development of TiAl alloys.
Intermetallics,2006,14(10):1114-1122
|
被引
103
次
|
|
|
|
|
2.
乔红超. 纳秒脉宽Nd:YAG激光冲击强化激光器的研制及分析.
中国激光,2013,40(8):0802001
|
被引
6
次
|
|
|
|
|
3.
罗新民. 激光冲击及其对金属材料组织和性能的影响.
热处理,2012,27(1):17-23
|
被引
4
次
|
|
|
|
|
4.
Zhao W Y. Surface recrystallization of a gamma-TiAl alloy induced by shot peening and subsequent annealing treatments.
Applied Surface Science,2013,270:690-696
|
被引
5
次
|
|
|
|
|
5.
周建忠. 基于不同应力比下激光喷丸强化6061-T6铝合金的疲劳裂纹扩展性能研究.
中国激光,2011,38(9):0903006
|
被引
14
次
|
|
|
|
|
6.
静永娟. 喷丸处理对TiAl合金拉伸性能的影响.
稀有金属,2009,33(5):750-753
|
被引
8
次
|
|
|
|
|
7.
朱伟. 微尺度激光喷丸纯铜数值模拟和统计优化分析.
中国激光,2011,38(s1):103005
|
被引
2
次
|
|
|
|
|
8.
张凌峰. 高锰钢在激光冲击作用下的微观特征.
中国激光,2011,38(6):0603025
|
被引
11
次
|
|
|
|
|
9.
Lin D. Larger scale, highly densenanoholes on surfaces by underwater laser assisted hydrogen etching near nanocrystalline boundary.
Applied Surface Science,2012,258(10):4254-4259
|
被引
3
次
|
|
|
|
|
10.
Amar H. Influence of the microstructure and laser shock processing (LSP) on the corrosion behaviour of the AA2050-T8 aluminium alloy.
Corrosion Science,2011,53(10):3215-3221
|
被引
16
次
|
|
|
|
|
11.
Luo K Y. The microstructural mechanism for mechanical property of LY2 aluminum alloy after laser shock processing.
Materials & Design,2010,31(5):2599-2603
|
被引
10
次
|
|
|
|
|
12.
Couturier S. Shock profile induced by short laser pulses.
Journal of Applied Physics,1996,79(12):9338-9342
|
被引
4
次
|
|
|
|
|
13.
Chu J P. Laser-shock processing effects on surface microstructure and mechanical properties of low carbon steel.
Materials Science and Engineering A,1999,260(1/2):260-268
|
被引
35
次
|
|
|
|
|
14.
Zhang Y K. The effect of laser shock processing on the mechanical properties and fatigue lives of the turbojet engine blades manufactured by LY2 aluminum alloy.
Materials and Design,2009,30(5):1697-1703
|
被引
38
次
|
|
|
|
|
15.
Luo K Y. Effects of laser shock processing on mechanical properties and micro-structure of ANSI 304 austenitic stainless steel.
Materials Science and Engineering A,2011,528(13/14):4783-4788
|
被引
22
次
|
|
|
|
|
16.
Thorslund T. Temperatures, pressures and stresses during laser shock processing.
Optics and Lasers in Engineering,2003,39(1):51-71
|
被引
17
次
|
|
|
|
|
17.
Montross Charles S. Laser shock processing and its effects on microstructure and properties of metal alloy: a review.
International Journal of Fatigue,2002,24(10):1021-1036
|
被引
171
次
|
|
|
|
|
了解气象卫星更多信息，请访问