Effect of Laser Beam Radiation on Fatigue Crack Propagation in Aisi 4150 Steel

Tsay,; Lin, Kun-You

doi:10.1046/j.1460-2695.1998.00101.x

Cited by 10 publications

(3 citation statements)

References 25 publications

(39 reference statements)

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“…Accordingly, it is possible to find something about failure investigation and application of this steel to pump shafts in [6]. Also, an effect of laser beam radiation on fatigue crack propagation in AISI 4150 (50CrMo4) was considered in [7]. Simulation of forming processes, which requires accurate constitutive models describing material behavior at large strains, and which includes some data regarding 50CrMo4 steel, can be found in [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Elevated Temperatures on Behavior of Structural Steel 50CrMo4

Brnić¹,

Čanađija²,

Turkalj³

et al. 2011

High Temperature Materials and Processes

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In this paper an effect of different temperatures on mechanical properties and creep responses of 50CrMo4 steel were considered. Both mechanical properties and creep behavior were determined by uniaxial tests. Curves representing specimen elongations as well as reduction in specimen areas at elevated temperatures are also shown. Creep curves as the responses of the considered material subjected to uniaxial stresses at high temperatures are also demonstrated. The notch impact test was carried out using Charpy impact machine and fracture toughness was calculated. The experimentally obtained data may be of significant interest in structure design procedure.

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Section: Introductionmentioning

confidence: 99%

Effect of Elevated Temperatures on Behavior of Structural Steel 50CrMo4

Brnić¹,

Čanađija²,

Turkalj³

et al. 2011

High Temperature Materials and Processes

View full text Add to dashboard Cite

show abstract

“…Residual stresses and their distribution within the surface or subsurface layers play an important role here [8]. An additional issue is the impact of laser surface treatment on the propagation of an existing crack under fatigue load [9,10]. In this case, too, substantial crack growth retarding effect can be achieved with lasertreatment [11].…”

Section: Introductionmentioning

confidence: 99%

Laser Hardening Parameters Influencing Component Lifetime and Residual Stresses

Němeček

Míšek

Černý³

et al. 2014

MSF

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Laser surface hardening is an advanced method of surface treatment of structural steels with a great potential for wide industrial applications. The technology is quite new and so, investigations have to be performed in order to gain a comprehensive knowledge about effects on microstructure, hardness, surface properties of treated materials, but also mechanical an particularly fatigue properties. Concerning fatigue resistance of material treated with this technology, results and knowledge recently published in the literature indicate that fatigue resistance can be either reduced or increased, even considerably, depending on numerous parameters of basic material, laser hardening parameters etc. This contribution contains results of a partial study of effect of laser hardening of relatively small specimens on fatigue resistance of 42CrMo4 steel. Two different parameters of the treatment were used, namely two speeds of laser beam on the material surface at constant beam energy. Unlike the lower speed, when fatigue resistance was slightly reduced, higher speed of laser beam resulted in a slight increase of fatigue resistance and fatigue limit. The results are discussed considering an occurrence of residuals stresses. Key words: Laser hardening, residual stress, lifetime, fatigue, fracture, microstructure, surface

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“…The presence of a residual compressive stress field ahead of the crack tip would decrease the fatigue crack growth rate and enhance the effect of crack closure. 24,25 Since the depth of the laser alloying zone is about 250 lm and the surface of the treated specimen is partially covered by laser alloying zones, the LDA ductile cast iron may be considered as a material with defects. The fatigue crack growth rate test was carried out with compact tension (CT) specimens to evaluate the fatigue resistance of LDA materials.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack propagation in laser alloyed ductile cast iron surface

Zhao

et al. 2013

Journal of Laser Applications

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Due 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. V C 2013 Laser Institute of America.

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Effect of Laser Beam Radiation on Fatigue Crack Propagation in Aisi 4150 Steel

Cited by 10 publications

References 25 publications

Effect of Elevated Temperatures on Behavior of Structural Steel 50CrMo4

Effect of Elevated Temperatures on Behavior of Structural Steel 50CrMo4

Laser Hardening Parameters Influencing Component Lifetime and Residual Stresses

Fatigue crack propagation in laser alloyed ductile cast iron surface

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