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| Microstructure and properties of FeCr and CoCr laser cladding coatings |
| LIU Wei1,3, FU Li1,3, CHEN Xiaoming1,2, ZHANG Lei1,3, LI Yuluo2, ZHANG Kai1,3 |
1. Key Laboratory of Surface Engineering of Equipments for Hydraulic Engineering of Zhejiang Province, Standard and Quality Control Research Institute, Ministry of Water Resources, Hangzhou 310012, China;
2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;
3. Hydraulic Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province,Hangzhou Machinery Design and Research Institute, Ministry of water resources, Hangzhou 310012, China |
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Abstract FeCr and CoCr cladding coatings were prepared by laser cladding technology on 40Cr steel substrate for hoist piston rod. The microstructure, microhardness, porosity and wear resistance of cobalt based and iron-based alloys were characterized and analyzed. The results show that the porosity of FeCr and CoCr alloy cladding coatings obtained by laser cladding technology approaches to zero. The average microhardness of FeCr and CoCr alloy cladding layer are 718.6 HV0.2 and 541.4 HV0.2, respectively. The impact toughness of FeCr alloy cladding layer is better than that of CoCr alloy cladding layer. After 180 min friction and wear test, the mass loss of FeCr alloy cladding layer is 0.002 01 g, the mass loss the CoCr alloy cladding layer is 0.003 47 g, and the mass loss of the matrix 40Cr is 0.081 08 g. The wear resistance of FeCr alloy cladding layer is better than that of CoCr alloy cladding layer and also better than 40Cr stainless steel. The wear mechanism of 40Cr steel, FeCr alloy and CoCr alloy cladding layer is mainly micro ploughing and adhesive wear.
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Received: 07 January 2020
Published: 11 August 2020
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2020, Vol. 25 
