| KONG Ming,SHEN Ling-lin,SHI Shi-hong.Skin Effect of Low Stress Repeated Impact of Ni-based Exponential Gradient Cladding[J],46(6):244-248 |
| Skin Effect of Low Stress Repeated Impact of Ni-based Exponential Gradient Cladding |
| Received:January 18, 2017 Revised:June 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.06.039 |
| KeyWord:exponential gradient cladding repeated impact grid coordinate method deformation rate skin effect microstructure phase diagram |
| Author | Institution |
| KONG Ming |
Suzhou Institute of Industrial Technology, Suzhou , China |
| SHEN Ling-lin |
Institute of Laser Manufacturing Technology, Soochow University, Suzhou , China |
| SHI Shi-hong |
Institute of Laser Manufacturing Technology, Soochow University, Suzhou , China |
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| Abstract: |
| The work aims to study effects of exponential gradient coating prepared on surface of parts by laser cladding under low stress repeated impact. Multipacting experiment was performed to 0Cr18Ni9 specimen on Ni-based exponential gradient cladding layer under low stress in grid coordinate division method, so as to acquire deformation data, calculate deformation rate and draw law curve. Phase diagram of the microstructure before and after collision was obtained by means of microscope. The impact stress applied was only 115 MPa, far below static compressive yield strength of the coating material and substrate, but the exponential gradient coating was subject to measurable plastic deformation. Deformation rate of the first grid layer was up to 18.97%, the most significant of all, and that of the second grid layer was up to 15.03%, that of the last grid layer close to the substrate was 0.29%, indicating that deformation of the exponential gradient coating had the “skin effect” after low stress and multipacting. The deformation of the substrate was basically consistent with that of the gradient coating. As juncture between coating and substrate was subject to instant high temperature laser cladding, the strain changed suddenly at the distance of at least 6 mm from the surface macroscopic plastic deformation increased, deformation rate increased to 3.92% sharply, but deformation of the substrate was generally consistent with the “skin effect”. Meanwhile, translation gliding observed with the phase diagram confirmed the fact as well. Under the low stress and repeated impact, the accumulated deformation of the specimen surface is the maximum, and the gradient decreases with the increase of the coating depth, which has confirmed the “skin effect”. At the same time, the resistance to repeated impact deformation is remarkably enhanced. |
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