Strain-induced grain refinement of cobalt during surface mechanical attrition treatment

Wu, Xiaolei; Tao, Nengguo; Hong, Youshi; Liu, G.; Xu, Bo; Lü, Jian; Lu, K.

doi:10.1016/j.actamat.2004.10.021

Cited by 228 publications

(143 citation statements)

References 37 publications

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“…This feature may be associated with a non-recrystallization phenomenon, as it is normally detected in CGS near the interfaces where the so-called Adiabatic Shear Instabilities (ASIs) occur. Similar electron difraction patterns were observed by Wu et al [17] in refined grains after mechanical attrition.…”

Section: Microstructural Characterizationsupporting

confidence: 75%

Cold Gas Sprayed Stellite-6 Coatings and their Wear Resistance

Cinca¹,

Guilemany²

2013

J Material Sci Eng

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Section: Microstructural Characterizationsupporting

confidence: 75%

Cold Gas Sprayed Stellite-6 Coatings and their Wear Resistance

Cinca¹,

Guilemany²

2013

J Material Sci Eng

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“…The angles formed between the various slip lines observed within the grains with several slip systems are α = 90°, β = 68° and γ = 55° ( Figure 5b). In this study, the superalloy has a fcc structure; in the case of materials with fcc structure, the principal slip systems are of the type <110> {111} [23]. -A reorientation of the grains due to the deformation involved by the explosive process and particularly at the interface during wave formation.…”

Section: Macrostructure and Microstructurementioning

confidence: 99%

Cobalt-based superalloy layers deposited on X38CrMoV5 steel base metal by explosion cladding process

Ettaqi

Langlois

Bigot

2008

Surface and Coatings Technology

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Thus cobalt retains its crystallographic structure (f.c.c) after cladding process. Hardness is evaluated with reference to microstructure. Near the interface, the hardness of the superalloy is of the order of 600 HV 1 kg . In the remainder of the thickness, hardness is of the order of 500 HV 1 kg , being greater than that of the unplated superalloy (270 HV 1 kg ). The track obtained by an indentation test at the interface under a load of 100 kg exhibits no cracking. This tends to prove the good metallurgical bond at the interface.

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“…They induce nanograins and grain size gradients into the surface region of bulk metals and alloys without changing the chemical compositions. Using transmission electron microscope (TEM), the grain refinement mechanisms induced by SPD for materials have been studied by many researchers [3][4][5][9][10][11][12][13]. The generation of dislocations, twinning, and development of grain boundaries with high angle misorientation are considered as the mainly reasons.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Surface Impact on the Fatigue Behavior of Ti-6Al-4V Subject to Simulated Body Fluid

Cao

Wang

et al. 2017

Metals

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Abstract:The effect of ultrasonic nanocrystal surface modification (UNSM) on the fatigue behavior of Ti6Al4V (TC4) in simulated body fluid (SBF) was investigated. UNSM with the condition of a static load of 25 N, vibration amplitude of 30 µm and 36,000 strikes per unit produced about 35 µm surface severe plastic deformation (SPD) layers on the TC4 specimens. One group was treated with a hybrid surface treatment (UNSM + TiN film). UNSM technique improves the micro hardness and the compressive residual stress. The surface roughness is increased slightly, but it can be remarkably improved by the TiN film. The fatigue strength of TC4 is improved by about 7.9% after UNSM. Though the current density of corrosion is increased and the pitting corrosion is accelerated, UNSM still improved the fatigue strength of TC4 after pre-soaking in SBF by 10.8%. Interior cracks initiate at the deformed carbide and oxide inclusions due to the ultrasonic impacts of UNSM. Corrosion products are always observed at the edge of fracture surface to both interior cracks and surface cracks. Coating a TiN film on the UNSMed surface helps to improve the whole properties of TC4 further.

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Strain-induced grain refinement of cobalt during surface mechanical attrition treatment

Cited by 228 publications

References 37 publications

Cold Gas Sprayed Stellite-6 Coatings and their Wear Resistance

Cold Gas Sprayed Stellite-6 Coatings and their Wear Resistance

Cobalt-based superalloy layers deposited on X38CrMoV5 steel base metal by explosion cladding process

Effect of Ultrasonic Surface Impact on the Fatigue Behavior of Ti-6Al-4V Subject to Simulated Body Fluid

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