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| EXPERIMENTAL RESEARCH ON THE SURFACE MODIFICATION OF 316L STAINLESS STEEL BY HIGH-INTENSITY PULSED ION BEAMS |
| Xu Wang;; |
| 大连理工大学材料科学与工程学院 |
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Cite this article:
Xu Wang. EXPERIMENTAL RESEARCH ON THE SURFACE MODIFICATION OF 316L STAINLESS STEEL BY HIGH-INTENSITY PULSED ION BEAMS. Acta Metall Sin, 2007, 43(4): 393-398 .
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Abstract The surface of 316L stainless steel was treated by high-intensity pulsed ion beams (HIPIB) with ion energy (70% H+, 30% C+) E = 300 keV, current density J = 200 A/cm2, shot number N = 1, 5, 10, pulse duration τ = 75ns. The surface morphology and the phase structure in the near surface region of original and treated specimens were analyzed with scanning electron microscopy (SEM) and X-ray diffraction (XRD). Electron probe microanalysis (EPMA) was used to study the distribution of elements on the irradiated specimens. It is found that the HIPIB irradiation can smooth the surface of the targets, and the preferred orientation was present in the surface layer of the treated specimens. Otherwise, selective ablation of impurities occurred during the interaction between HIPIB and the targets. The microhardness was increased in a depth range of up to 100 μm due to extremely high stresses and shock waves induced by the bombardment, so as to the friction coefficient of the irradiated surfaces was reduced and the wear resistance of them was improved significantly. Under the cooperation of the smooth surface and the grain refinement with the selective ablation of impurities, the electrochemical corrosion resistance of 316L was enhanced markedly. HIPIB irradiation prolongs the fatigue limit and creep rupture life of 316L, simultaneity reduces the steady creep rate with increasing the shot number.
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Received: 23 August 2006
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