1998 Fiscal Year Final Research Report Summary
Formation of fine alloy layer by using the penetration heat source effect of electron.
| Project/Area Number |
09650797
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Kinki University |
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Principal Investigator |
TOMIE Michio Kinki University, School of Science and Engineering, Professor., 理工学部, 教授 (60029139)
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| Co-Investigator(Kenkyū-buntansha) |
ABE Nobuyuki Osaka University, Joining and Welding Research Institute, Associate Professor., 接合科学研究所, 助教授 (90127176)
MORIMOTO Junji Kinki University, School of Science and Engineering, Professor., 理工学部, 教授 (30088471)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Electron Beam Surface Modification / Fine Alloy Layer / Penetration Heat Source Effect / Beam Penetration Effect / Ultra High Voltage Electron Beam |
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| Research Abstract |
The penetration heal source effect, that high voltage electrons penetrate deeply into metallic materials melting them during penetration process was applied to surface modification. Surface modification of metals was performed with the 500kV ultra high voltage electron beam heat source which is developing by the authors. Alloy powder for thermal spraying (80%Ni 2O%Cr, thickness : O.3-O.6mm) which was pasted on steels (SM400, SK4) were irradiated by the 500kV electron beam (power0.3-3kW, beam scanning speed : 0.75-2mm/s, beam diameter : 4-7mm) . Powder and a part of base metal were instantaneously melted from inside of materials, resulting suppression of sputtering and internal defects such as porosities. Weld beads having the penetration depth of 0.4-O.8mm with high concentration rate of powder elements (Ni : -4O%, Cr : -10%) were obtained.
Nelting phenomena were observed by a high speed video camera during formation process of weld bead. It is found that the melting process of alloy powder on base metal was repeated with few hundreds millisecond intervals and this periodic process suppressed spattering. Result of 5%112S04 erosion test of weld bead containing only 13%Ni showed a similar value for stainless steel (SUS3O4). This means that further improvement of erosion property can be expected by properly selection of chemical composition of powder.
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Research Products
(2 results)
