Metallographic Study of Laser Thermal Fatigue Damage on Piston

Article Preview

Abstract:

The experiments of thermal fatigue damage on piston were conducted by shaped high power laser. Microstructure of thermal fatigue damaged specimen was characterized by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The mechanical properties of thermal fatigue specimen were evaluated by microhardness and the corresponding damaged mechanisms were discussed. The results show that cracks originated from the interface of Al-matrix and intermetallic phase due to the thermal and mechanical mismatch between the brittle components of the microstructure and the surrounding ductile matrix. Oxides of thermal fatigue crack can accelerate the damage of piston. There exists a decline tendency in the microhardness of piston at all locations after thermal fatigue tests due to the comprehensive effects of nonequilibrium distribution of temperature and cooling method.

You might also be interested in these eBooks

Info:

Periodical:

Advanced Materials Research (Volumes 415-417)

Pages:

2053-2061

Citation:

Online since:

December 2011

Export:

Price:

Permissions CCC:

Permissions PLS:

Сopyright:

© 2012 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

[1] Y.C. Zhou Z.M. Zhu Z.P. Duan. Thermal fracture characteristics induced by laser beam. International Journal of Solids and Structures 38(2001) 5647-5660.

DOI: 10.1016/s0020-7683(00)00357-7

Google Scholar

[2] Y.C. Zhou S.G. Long, Y.W. Liu. Thermal failure mechanism and failure threshold of SiC particle reinforced metal matrix composites induced by laser beam. Mechanics of Materials 35(2003)1003-1020.

DOI: 10.1016/s0167-6636(02)00322-8

Google Scholar

[3] Luo Yongyao, Wang Zhengwei, ZengJidi, Lin Jiayang. Fatigue of piston rod caused by unsteady,unbalanced,unsynchronized blade torques in a Kaplan turbine. Engineering Failure Analysis 17(2010)192-199.

DOI: 10.1016/j.engfailanal.2009.06.003

Google Scholar

[4] Hong-Wei Song, Gang Yu, Jian-Song Tan, Liang Zhou, Xiao-Li Yu. Thermal fatigue on pistons induced by shaped high power laser. Part I: Experimental study of transient temperature field and temperature oscillation. International Journal of Heat and Mass Transfer 51 (2008)757~767.

DOI: 10.1016/j.ijheatmasstransfer.2007.04.035

Google Scholar

[5] Hong-Wei Song, Shao-Xia Li, Ling Zhang , Gang Yu, Liang Zhou, Jian-Song Tan. Numerical simulation of thermal loading produced by shaped high power laser onto engine parts. Applied Thermal Engineering 30 (2010)553-560.

DOI: 10.1016/j.applthermaleng.2009.10.018

Google Scholar

[6] Yu-Ching Yang, Haw-Long Lee. Transient thermal loading induced optical effects in single-coated optical fibers with interlayer thermal resistance. Optical Fiber Technology 14(2008)143-148.

DOI: 10.1016/j.yofte.2007.09.009

Google Scholar

[7] Ekrem Buyukkaya, Muhammet Cerit. Thermal analysis of a ceramic coating diesel engine piston using 3-D finite element method. Surface and Coatings Technology202 (2007)398-402.

DOI: 10.1016/j.surfcoat.2007.06.006

Google Scholar

[8] Tarun Goswami. Low cycle fatigue life prediction—a new model. Intenational Journal of Fatigue 19(2)(1997)109-115.

DOI: 10.1016/s0142-1123(96)00065-5

Google Scholar

[9] E. Visca, S. Libera,A. Orsini, B. Riccardi, M. Sacchetti. Thermal fatigue equipment to test joints of materials for high heat flux components. Fusion Engineering and Design 49-50(2000) 377-382.

DOI: 10.1016/s0920-3796(00)00239-8

Google Scholar

[10] Tilmann Beck, Detlef Lohe, Jochen Luft,Ingo Henne. Damage mechanisms of Al-Si-Mg alloys under superimposed thermal-mechanical fatigue and high-cycle fatigue loading. Materials Science and Engineering A 468-470 (2007)184-192. Figure Captions Fig.1. Illustration of superimposed shaped laser irradiation. Fig.2. Temperature cycle record. Fig.3. Experimental system of laser simulated thermal fatigue on piston. Fig.4. Microstructure of piston ZL109 aluminium alloy. Fig.5. Macromorphology of crack during thermal fatigue on piston. Fig.6. Crack initiation and propagation during thermal fatigue on piston: (a) intermetallic phase located in the crack path; (b) crack initiated at an intermetallic phase detached from the surrounding α-Al matrix; (c) cracks propagating along the intermetallic phase. Fig.7. Fracture morphology of thermal fatigue crack. Fig.8. EDS spectrum of the oxide particles. Fig.9. Microhardness distribution from the top to the bottom surface of piston. Fig.1 Fig.2 Fig.3 Fig.4 Fig.5 Fig.6 Fig.7 Fig.8 Fig.9

Google Scholar