An in situ transmission electron microscope study of the thermal stability of near-surface microstructures induced by deep rolling and laser-shock peening

Altenberger, I.; Stach, Eric A.; Liu, Gao; Nalla, Ravi K.; Ritchie, R.O.

doi:10.1016/s1359-6462(03)00143-x

Cited by 98 publications

(47 citation statements)

References 6 publications

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“…It was realized that further information on the behavior of dislocations in the material might be obtained from a study of their motion. It has been possible to study the motion of dislocations in 304 ASS [14,17,18]. In the present investigation, a careful analysis of UFG of the fracture feature morphologies and the relation to the mechanical properties has been made in the ASS.…”

Section: Introductionmentioning

confidence: 99%

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

Gong

et al. 2017

Metals

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Eighty percent heavy cold thickness reduction and reversion transformation in the temperature range 700-950 • C for 60 s were performed to obtain the reverted ultrafine-grained (UFG) structure in 304 austenitic stainless steel. Through mechanical property experiments and transmission electron microscopy (TEM) of micro deformation of the UFG austenite structure, the tensile fractographs showed that for specimens annealed at 700-950 • C, the most frequent dimple sizes were approximately 0.1-0.3 µm and 1-1.5 µm. With the increase in annealing temperature, the dimple size distribution of nano-sized grains turned to micron-size. TEM micro deformation experiments showed that specimens annealed at 700 • C tended to crack quickly. In the grain annealed at 870 • C, partial dislocations were irregularly separated in the crystal or piled up normal to the grain boundaries; stacking faults were blocked by grain boundaries of small grains; twins held back the glide of the dislocations. In the grain annealed at 950 • C, the deformation twins were perpendicular to ε martensite. Fine grain was considered a strengthening phase in the UFG structure and difficult to break.

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Section: Introductionmentioning

confidence: 99%

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

Gong

et al. 2017

Metals

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“…The results showed that LP is an effective surface treatment technique that can induce beneficial compressive residual stress and microstructures, such as a high density of dislocation, mechanical twins, and refined grains, which eventually retards fatigue crack growth. However, LP-induced beneficial effects on fatigue properties have shown to be released at high temperature and cycle loading, consequently limiting its application [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening

Huang

Wang

Sheng

et al. 2016

Metals

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Abstract:The aim of this paper is to study the effects of laser peening (LP) on the residual stress distribution and microstructure evolution of AA 6061-T6 under different temperatures. A laser peening experiment was conducted on the square-shape samples by using single spot and 50% overlap shock. Three-dimensional surface morphologies of treated samples were observed. The influence of peening temperature on the distribution of compressive residual stress was analyzed. An optical microscope (OM) and a transmission electron microscope (TEM) were employed to observe the microstructure evolution of the samples before and after LP. The results indicate that, as the peening temperature increases, the micro-hardness increases first and then decreases. The LP process induces high-amplitude compressive residual stress on the surface at different temperatures even if the compressive residual stress slightly reduces with increases in temperature. The maximum compressive residual stress affected layer depth is about 0.67 mm, appearing at a temperature of 160 • C. The OM test revealed that the grain size was significantly decreased after warm laser peening (WLP) and that the average value of grain size was reduced by 50%. The TEM test shows that more dislocation tangles were produced in AA 6061-T6 after WLP; compared to the LP process, the precipitate-dislocation interaction can benefit both strength and ductility for AA 6061-T6, thus enhancing the mechanical properties of the material.

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“…Most studies on the fatigue resistance of deep-rolled and lasershock peened Ti-6Al-4V alloys have focused on the LCF regime [18] and considered the issues of the near-surface residual stresses [11,21] and surface microstructures induced by the mechanical surface treatment [22]. One question is the effectiveness of these surface treatments for applications that required higher temperature service.…”

Section: Introductionmentioning

confidence: 99%

On the effect of deep-rolling and laser-peening on the stress-controlled low- and high-cycle fatigue behavior of Ti–6Al–4V at elevated temperatures up to 550°C

Altenberger

Nalla

Sano

et al. 2012

International Journal of Fatigue

248

101

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An in situ transmission electron microscope study of the thermal stability of near-surface microstructures induced by deep rolling and laser-shock peening

Cited by 98 publications

References 6 publications

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening

On the effect of deep-rolling and laser-peening on the stress-controlled low- and high-cycle fatigue behavior of Ti–6Al–4V at elevated temperatures up to 550°C

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