Research on Fiber Laser Remelting of 45 Steel

Yuebo, 屈岳波 Qu; Zhao, Liguo; Ruihua, 张瑞华 Zhang; Yan, 张岩 Zhang; Yuekai, 裴悦凯 Pei; Zhiling, 田志凌 Tian

doi:10.3788/al20133304.398

Cited by 1 publication

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“…With the increase of distance from the surface, the absorbed laser energy decreases, forming high temperature gradient. In the region near the texture, the temperature exceeds Ac1, martensite and troostite [26,27] are produced. Otherwise, the temperature does not reach Ac1 and there is not phase transformation, but the grain size is refined and the dislocation density is increased.…”

Section: Microstructurementioning

confidence: 99%

Theoretical and Experimental Study on Normal Contact Stiffness of Plane Joint Surfaces With Surface Texturing

Yin

Huang

Zhou

et al. 2023

Tribology Transactions

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Effects of surface texturing on the normal contact stiffness of joint surfaces had been investigated by experiments in many previous researches; however, there are relatively few theoretical models in this regard. The rough surface with surface texturing can be divided into two parts: the textured zone and the remaining zone, and their theoretical models are established respectively in this research considering surface morphology and material properties. For the textured zone, micro textures are modeled theoretically based on the three-dimensional topographic data obtained via a VK-X250 type laser profilometer from KEYENCE. For the remaining zone, the model of normal contact stiffness is established based on the fractal theory for the surface topography description and elastoplastic deformation of surface asperities, and the structure function method is used to calculate the fractal dimension of rough surface profiles. In the experiment, the normal contact stiffness of specimens is obtained under different normal loads, and the test results are compared with the theoretical predictions. The result shows that the predictions of proposed theoretical model are in good agreement with the experimental data. For the joint surfaces with Sa > 2.69 μm, the normal contact stiffness can be effectively increased through proper surface texturing.

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Section: Microstructurementioning

confidence: 99%