| JIANG Shao-qun,WANG Gang,LYU Chang-yue.Effect of (Ti+B4C)/Fe901 Ratio on Microstructure and Microhardness of Fe-based Coatings Synthesized by Plasma Cladding[J],46(9):26-31 |
| Effect of (Ti+B4C)/Fe901 Ratio on Microstructure and Microhardness of Fe-based Coatings Synthesized by Plasma Cladding |
| Received:March 30, 2017 Revised:September 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.09.005 |
| KeyWord:reactive plasma cladding Fe-based coating in situ synthesis TiB2-TiC microhardness microstructure |
| Author | Institution |
| JIANG Shao-qun |
1. Nantong Hohai University Ocean and Offshore Engineering Research Institute, Nantong , China;2.Hohai University, Nanjing , China |
| WANG Gang |
Hohai University, Nanjing , China |
| LYU Chang-yue |
Hohai University, Nanjing , China |
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| Abstract: |
| The work aims to obtain optimized composition of high quality plasma cladded Fe-based coatings. Fe-based coatings were synthesized in situ on Q235 steel in reactive plasma cladding method with Fe901 alloy, Ti and B4C powders as raw materials. The effects of (Ti+B4C)/Fe901 mass ratio (15/85, 25/75 and 35/65) on formation of reinforcement phases in the coatings, interfacial bonding, microstructure and microhardness of the coatings were investigated. The Fe-based coatings are metallurgically bonded to the substrate. The quality of interface joint deteriorates when (Ti+B4C)/Fe901 mass ratio is high. The coating mainly consists of (Fe, Cr) solid solution, TiB2, TiC, Ti8C5, Fe3C and FeB phases provided with (Ti+B4C)/Fe901 mass ratio of 15/85. Increasing the (Ti+B4C)/Fe901 mass ratio might not result in formation of a new phase, but it can inhibit FeB precipitation. TiC in the coatings takes shape by multi-steps reaction. Microhardness of the coatings generally increases as the (Ti+B4C)/Fe901 ratio increases, and is on the rise on the whole. When (Ti+B4C)/Fe901 ratio is not more than 25/75, microstructure of the coatings is relatively uniform and the microhardness varies steadily along the depth direction. However, the microstructure and microhardness of the coating presents gradient distribution as (Ti+B4C)/Fe901 ratio further increased. Microhardness difference between the upper and lower coating can be up to 630HV0.1. The plasma cladded Fe-based coatings with gradient or uniform microstructure and microhardness can be obtained by adjusting reactant content of the main reinforcement phases, so as to meet different practical application requirements. |
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