Microstructure evolution and electroplasticity in Ti64 subjected to electropulsing-assisted laser shock peening

Zhang, Hao; Ren, Zhencheng; Li, Jun; Zhao, Jingyi; Liu, Zhikun; Lin, Dong; Zhang, Ruixia; Graber, Matthew J.; Thomas, Nicholas K.; Kerek, Zachary D.; Wang, Guoxiang; Dong, Yalin; Ye, Chang

doi:10.1016/j.jallcom.2019.06.156

Cited by 55 publications

(17 citation statements)

References 38 publications

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“…The plastic deformation at warm temperature caused the plastic deformation on the surface of the material, which could lead to the appearance of supervoids. In the process of WLSP, the vacancy combined with the -Nb atom to form the vacancy–Nb pair [ 20 ]. The concentration gradient forces caused the γ”/δ interface to move, and the decomposed δ phases expanded and spheroidized at lower temperatures (the relationship between the grain boundary phase and its adjacent phase satisfied the orientation relationship of Burgers, as showed in Figure 12 ) [ 21 ].…”

Section: Resultsmentioning

confidence: 99%

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Superalloy GH4169 Subjected to Warm Laser Shock Peening

Yang

Zhao

et al. 2020

Materials

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Laser shock peening (LSP), as an innovative surface treatment technology, can effectively improve fatigue life, surface hardness, corrosion resistance, and residual compressive stress. Compared with laser shock peening, warm laser shock peening (WLSP) is a newer surface treatment technology used to improve materials’ surface performances, which takes advantage of thermal mechanical effects on stress strengthening and microstructure strengthening, resulting in a more stable distribution of residual compressive stress under the heating and cyclic loading process. In this paper, the microstructure of the GH4169 nickel superalloy processed by WLSP technology with different laser parameters was investigated. The proliferation and tangling of dislocations in GH4169 were observed, and the dislocation density increased after WLSP treatment. The influences of different treatments by LSP and WLSP on the microhardness distribution of the surface and along the cross-sectional depth were investigated. The microstructure evolution of the GH4169 alloy being shocked with WLSP was studied by TEM. The effect of temperature on the stability of the high-temperature microstructure and properties of the GH4169 alloy shocked by WLSP was investigated.

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Section: Resultsmentioning

confidence: 99%

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Superalloy GH4169 Subjected to Warm Laser Shock Peening

Yang

Zhao

et al. 2020

Materials

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“…The laser shock temperature was de decided by based on the formula of "qian -xiaoli model" proposed by Prof. Qian [18]. According to his theory, the temperature range of the dynamic strain aging of alloy is approximately 0.2 ~ 0.5Tm, (Tm is the melting point temperature of an alloy).…”

Section: Warm Laser Shock Peening Processmentioning

confidence: 99%

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Super-Alloy GH4169 Subjected to Warm Laser Shock Peening

Lu¹,

Yang²,

Zhao³

et al. 2020

Preprint

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Laser shock peening as an innovative surface treatment technology can effectively improve the fatigue life, sur-face hardness, corrosion resistance, and residual compressive stress. Compared with the laser shock peening, the warm laser shock peening (WLSP) is a new surface treatment technology to improve materials’ surface performances, which takes advantage of thermal mechanical effects on stress strengthening and micro-structure strengthening, results in more stable distribution of the residual compressive stress under heating and cyclic loading process. In this paper, the microstructure of GH4169 nickel super-alloy processed by WLSP technology with differ-ent laser parameters were investigated. The proliferation and tangling of dislocations in GH4169 were observed and the dislocation density increased after WLSP treatment. The influences of different treatment by LSP and WLSP on the microhardness distribution of the surface and along cross-sectional depth were investi-gated. The microstructure evolution of the GH4169 alloy being shocked with WLSP were studied by TEM. The effect of temperature on the stability of high temperature microstructure and properties of GH4169 alloy WLP was investigated.

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“…The properties of carburizing case of this steel may change not only by modification of the thermochemical processing parameters, but also as a result of machining, which includes both abrasive and cutting processes. It is also known that usage of quite new techniques, e.g., electro-pulsing, ultrasonic surface layer treatment presented by authors of publications [ 5 , 6 , 7 , 8 ], could improve the surface structure, mechanical properties, and microstructure, in some cases. However these technics cannot be directly applied to gear teeth surfaces improvement due to the specific geometric shape of gear teeth.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Chip Binding on the Parameters of the Case-Hardened Layer of Tooth Surfaces for AMS 6308 Steel Gears Processed by Thermochemical Treatment

Fularski¹,

Filip

2021

Materials

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The following article describes influence of pressure welded or bound chips to the gear tooth flank and/or the tooth root on a carburized case and surface layer hardness of Pyrowear 53 steel gears, machined by Power Skiving method. This paper is focused only on one factor, the chips generated while forming gear teeth by power skiving, which could result in local changes in the carburized case parameters as a negatively affecting point of mechanical performance of the carburized case. The chips, due to the specifics of the power skiving process and the kinematics of tooth forming, could be subject to the phenomena of pressure welding or binding of chips to the tooth. During the carburizing stage of the downstream manufacturing processes, the chips form a diffusion barrier, which ultimately could result in localized changes in the carburized case. This work was an attempt to answer the question of how and to what extent the chips affect the case hardening. Performed simulations of chips by a generating cupper “spots”, mentioned in the study, represent a new approach in connection with minimization of errors, which could appear during carbon case depth and case hardness analysis for typical chips, generated during the machining process—assurance that a complete chip was bound to the surface. Hardness correlation for zones, where the chip appears with areas free of chips, gives simple techniques for assessment. Performed tests increased the knowledge about the critical size of the chip—1.5 mm, which could affect the case hardening. Obtained experimental test results showed that the appearance of chip phenomena on the gear tooth might have a negative impact on a carburized case depth and hardened layer.

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Microstructure evolution and electroplasticity in Ti64 subjected to electropulsing-assisted laser shock peening

Cited by 55 publications

References 38 publications

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Superalloy GH4169 Subjected to Warm Laser Shock Peening

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Superalloy GH4169 Subjected to Warm Laser Shock Peening

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Super-Alloy GH4169 Subjected to Warm Laser Shock Peening

The Effect of Chip Binding on the Parameters of the Case-Hardened Layer of Tooth Surfaces for AMS 6308 Steel Gears Processed by Thermochemical Treatment

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