- Wu Zhigang
Wu Zhigang
Hefei General Machinery Research Institute CO.,Ltd.,National Engineering Technical Research Center on Pressure Vessels and Piping Safety,China Petrochemical Furnace Tube Quality Inspection and Evaluation Center,Hefei,Anhui,P. R. China,230031
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Search for this author on this site - Chen Tao
Chen Tao
Hefei General Machinery Research Institute CO.,Ltd.,National Engineering Technical Research Center on Pressure Vessels and Piping Safety,China Petrochemical Furnace Tube Quality Inspection and Evaluation Center,Hefei,Anhui,P. R. China,230031
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Search for this author on this site - Liu Chunjiao
Liu Chunjiao
Hefei General Machinery Research Institute CO.,Ltd.,National Engineering Technical Research Center on Pressure Vessels and Piping Safety,China Petrochemical Furnace Tube Quality Inspection and Evaluation Center,Hefei,Anhui,P. R. China,230031
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Hefei General Machinery Research Institute Co., Ltd, National Engineering & Technical Research Center on Pressure Vessels and Piping Safety, Sinopec Inspection and Assessment center on Furnace Tube Hefei, Anhui, P. R. China, 230031
TG144
Anhui Provincial Key Research and Development Plan (No.202104a05020023), Youth Science and Technology Fund of Hefei General Machinery Research Institute Co., Ltd. (No.2020011727)
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The phase composition and microstructure of 27Cr44Ni5W3Al+MA ethylene cracking furnace tube were analyzed using XRD, OM, SEM and TEM. The results showed that the as-cast microstructures of the furnace tube were mainly composed of austenite matrix (γ phase) and fishbone multi-phase carbides on grain boundaries, the inside of the multi-phase carbides are lamellar M7C3, while the outside are blocky M23C6. In addition, two shapes of Ni3Al (γ' phases) were observed, namely the granular distributed near the junction between M23C6 and γ, and the blocky adjacent to M23C6. Both of M23C6 and granular γ' are the cube-on-cube orientation relationships with the γ matrix ([101]γ∥[101]M23C6，(-111)γ∥(-111)M23C6，(11-1)γ∥(11-1)M23C6；[1-12]γ∥[1-12]M23C6，(-111)γ∥(-111)M23C6，(220)γ∥(220)M23C6。[101]γ∥[101]γ'，(-111)γ∥(-111)γ'，(11-1)γ∥(11-1)γ'；[1-12]γ∥[1-12]γ'，(-111)γ∥(-111)γ'，(220)γ∥(220)γ'). In addition, a large number of dislocations were observed in the as-cast microstructure, with sparse distribution away from M23C6 and dense distribution near M23C6. The precipitation mechanism of γ' and M23C6 during centrifugal casting was also discussed.
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[Wu Zhigang, Chen Tao, Liu Chunjiao. Study on the As-cast Microstructure of Centrifugal Casted 27Cr44Ni5W3Al+MA Ethylene Cracking Furnace Tube[J]. Rare Metal Materials and Engineering,,().]
DOI：10.12442/j. issn.1002-185X.20240136
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History
- Received:March 12,2024
- Revised:April 01,2024
- Adopted:April 18,2024