| GE Yan-liu,DENG De-wei,LU Jun,TIAN Xin,GUAN Meng.Study on Microstructure and Microhardness in PTA Weld Hardfacings of Two Types of Ni-Cr-B-Si Alloys[J],(2):5-8,19 |
| Study on Microstructure and Microhardness in PTA Weld Hardfacings of Two Types of Ni-Cr-B-Si Alloys |
| Received:November 01, 2011 Revised:February 20, 2012 |
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| DOI： |
| KeyWord:PTAW Ni-Cr-B-Si microstructure hardness |
| Author | Institution |
| GE Yan-liu |
School of Material Science and Engineering , Dalian University of Technology , Dalian , China |
| DENG De-wei |
School of Material Science and Engineering , Dalian University of Technology , Dalian , China |
| LU Jun |
School of Material Science and Engineering , Dalian University of Technology , Dalian , China |
| TIAN Xin |
ShenyangBlowerGroup,Shenyang,China |
| GUAN Meng |
ShenyangBlowerGroup,Shenyang,China |
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| Abstract: |
| The Ni-Cr-B-Si alloy powder was deposited on the surface of 304L stainless steel by plasma transferred arc welding(PTAW). To determine the microstructure and properties of hardfacings with two types of alloys, scanning electron microscope, X-ray diffraction, electron microprobe and hardness tester were employed. The results show that the coatings consist of γ-Ni dendrites and eutectic mixture as interdendritic constituents. It is found that the content fraction of the dendritic phases drastically decreases and the proportion of chromium borides and carbides increases with an increase of Cr, C, B and Sicontent. Microhardness testing reveals that an increase in content of chromium borides and carbides leads to a significant increase of hardness. |
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