Surface nanocrystallization, austenization and hardening of medium carbon steel by an explosive impact technique

Zheng, Tong; Shi, Zhiming; Tong, S.J.; Wang, D.W.; Li, P.F.

doi:10.1016/j.surfcoat.2014.04.042

Cited by 16 publications

(6 citation statements)

References 20 publications

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“…Other mechanical surface hardening methods that have been applied to steel materials include explosive impact, high energy shot peening, etc. [4]. All these techniques involve severe plastic deformation of surface layer that is undergoing hardening treatment.…”

Section: Introductionmentioning

confidence: 99%

Rapid surface hardening and enhanced tribological performance of 4140 steel by friction stir processing

Lorenzo-Martín

Ajayi

2015

Wear

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reported the effect of exercise on pain in PD were identified, though pain was not the focus of the intervention in either trial. One reported a trend towards a reduction in pain, and the other reported a reduction in the presence and intensity of pain following exercise. However, these results do not indicate if exercise targets particular subtypes of pain. Conclusion(s):The neurophysiological effects of exercise such as neuroplasticity, neuro-restoration and activation of dopaminergic and non-dopaminergic pain inhibition provide a sound biological rationale for employing exercise in pain management. However, randomised controlled trials of exercise interventions for people with PD are required to determine if exercise results in a clinical reduction in pain in this population.Implications: Therapists should consider assessing people with PD for pain and monitoring any changes in pain in response to exercise interventions.

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Section: Introductionmentioning

confidence: 99%

Rapid surface hardening and enhanced tribological performance of 4140 steel by friction stir processing

Lorenzo-Martín

Ajayi

2015

Wear

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“…4a, it can be seen that the microscopic morphology between precipitated phase and dislocation is distinctly different within different deformation layer. This is because the increasing strain and strain rate from matrix to the topmost surface play a major role in fabricating the gradient nanostructured layer during SPD [3][4][5]. At the same time, the density of coordinated deformation dislocation (ρ) mainly depends on the gradient of plastic strain.…”

Section: Resultsmentioning

confidence: 99%

“…Stacking fault energy (SFE) plays a key role in SGN process. SGN process of materials with low SFEs is achieved by twin deformation [3] and dislocation movement [4, 5], while SGN process of materials with high SFEs is achieved by dislocation movement [6, 7]. The gradient nanocrystallisation mechanism of aluminium alloy with high SFE and the influence of gradient nanostructured surface layer on mechanical properties have been studied in detail.…”

Section: Introductionmentioning

confidence: 99%

Effect of precipitated phase on dislocation activity under high‐frequency impacting and rolling

Zhang

Qiu

De-sheng

et al. 2018

Micro & Nano Letters

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Al-Mg-Si alloy was treated through high-frequency impacting and rolling. Microstructures of different deformation layers were observed by transmission electron microscopy. The interaction mechanism between precipitated phase and dislocations for different deformation layer was studied. A detailed schematic of coordinated deformation dislocation mechanism around precipitated phase was established. Results show that lots of coordinated deformation dislocations are formed around the precipitated phase which is far away from the treated surface. With the decrease of distance from the treated surface, dislocation motion is blocked and dislocation lines gradually intersect, which speed up the segmentation and refinement of grains.

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“…Meanwhile, significant point defects concentration exists. In our previous works, 22,23) we successfully prepared a hardened layer on a 6 mm thick carbon steel plate and pure copper plate using single explosive impact technique. The experimental results indicate that the hardening effects contributed to high-density dislocation walls and dislocation tangles.…”

Section: Enhancement Of Mechanical Properties Of Aisi304 Stainless Thmentioning

confidence: 99%

Enhancement of Mechanical Properties of AISI304 Stainless Thin Plate by Low-pressure, Repeated Explosive Hardening

et al. 2019

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In order to improve the mechanical properties of AISI304 stainless thin plate, a low-pressure, repeated explosive hardening process was carried out using the explosive treatment technique. Both the residual microstructures and mechanical properties of the treated material were investigated and compared with the undeformed sample. The results show that microhardness, yield strength and ultimate strength of the treated sample remarkably enhanced during a low-pressure, repeated explosive hardening. We propose that the strengthening mechanisms are closely related to the microstructure evolution during the lowpressure, repeated explosive hardening. The corresponding microstructures in the twice hardening samples were dominated by deformation twins, α martensites, with a few deformation bands. The microstructures in the four times hardening samples were characterized by deformation bands and α martensites, where volume fraction of martensite was larger than that in the twice hardening sample.

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Surface nanocrystallization, austenization and hardening of medium carbon steel by an explosive impact technique

Cited by 16 publications

References 20 publications

Rapid surface hardening and enhanced tribological performance of 4140 steel by friction stir processing

Rapid surface hardening and enhanced tribological performance of 4140 steel by friction stir processing

Effect of precipitated phase on dislocation activity under high‐frequency impacting and rolling

Enhancement of Mechanical Properties of AISI304 Stainless Thin Plate by Low-pressure, Repeated Explosive Hardening

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