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Fatigue crack propagation in laser alloyed ductile cast iron surface
Li ZY(李正阳); Zhao HY; Gu Y; Zhong ML; Zhang B; Zhang HJ; Liu WJ; Ren ZY(任志远); Yang MJ(杨明江); Lin HQ; Li, ZY (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
Source PublicationJOURNAL OF LASER APPLICATIONS
2013-02-01
Volume25Issue:1Pages:012003/1-012003/6
ISSN1042-346X
AbstractDue to a limited dimension of the focused laser beam, multiple passes are required to treat large surface areas, which results in overlapping of laser tracks. This process increases the cracking susceptibility and is a major barrier for the wide application of the laser treatment. To avoid the formation of cracks in multiple overlapping laser tracks, a novel technique referred to as the laser dispersed alloying (LDA) has been developed. The technique consists of creating a dispersed pattern of laser alloying on the surface to be processed. This treatment enhances the fatigue resistance of the surface layer. In the present study, the microstructure, the residual stress, and the fatigue crack growth rate (FCGR) for the ductile cast iron surface formed with the LDA technique were investigated. It was found that the fatigue resistance of the ductile cast iron is markedly increased after the LDA process, due to the compressive stresses and the fine dendritic structure formed in the laser alloying zone, the excellent bond strength between the laser alloying zone and the substrate, and the martensite shell surrounding graphite nodule in the heat affected zone near the boundary of the laser alloying zone.
KeywordLaser Dispersed Alloying Fatigue Resistance Residual Stress Ductile Cast Iron
Subject Area固体力学 ; 疲劳与断裂力学
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000320189600003
Funding OrganizationChinese Postdoctoral Science Fund [20070410522]; Ministry of Science and Technology of the P. R. China [2009BAG12A01-B10-2]
DepartmentMAMYAG激光毛化技术
ClassificationQ3
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/46873
Collection先进制造工艺力学重点实验室
Corresponding AuthorLi, ZY (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Li ZY,Zhao HY,Gu Y,et al. Fatigue crack propagation in laser alloyed ductile cast iron surface[J]. JOURNAL OF LASER APPLICATIONS,2013,25(1):012003/1-012003/6.
APA 李正阳.,Zhao HY.,Gu Y.,Zhong ML.,Zhang B.,...&Li, ZY .(2013).Fatigue crack propagation in laser alloyed ductile cast iron surface.JOURNAL OF LASER APPLICATIONS,25(1),012003/1-012003/6.
MLA 李正阳,et al."Fatigue crack propagation in laser alloyed ductile cast iron surface".JOURNAL OF LASER APPLICATIONS 25.1(2013):012003/1-012003/6.
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