| LIU Wanying,LI Xiaopeng,LIN Yuanhua,ZHANG Zhi,LIU Wenchao,HOU Xinxin,LIN Zeyang.Effect of Sintering Temperature on Microstructure and Properties of Aluminum Alloy Used for Oil Well Pipes[J],53(22):62-71 |
| Effect of Sintering Temperature on Microstructure and Properties of Aluminum Alloy Used for Oil Well Pipes |
| Received:November 19, 2023 Revised:March 06, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.22.005 |
| KeyWord:sintering temperature aluminum alloy microstructure mechanical properties corrosion resistance |
| Author | Institution |
| LIU Wanying |
School of New Energy and Materials, Chengdu , China |
| LI Xiaopeng |
School of New Energy and Materials, Chengdu , China |
| LIN Yuanhua |
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu , China |
| ZHANG Zhi |
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu , China |
| LIU Wenchao |
School of New Energy and Materials, Chengdu , China |
| HOU Xinxin |
School of New Energy and Materials, Chengdu , China |
| LIN Zeyang |
School of New Energy and Materials, Chengdu , China |
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| Abstract: |
| Powder metallurgy technology is simple and easy to achieve mass produce, meanwhile, it can significantly reduce the material preparation temperature, thus reducing interfacial reactions, and improving interfacial bonding stability. The use of powder metallurgy technology to prepare high-performance aluminum alloy materials for oil well pipes is of great significance for promoting the development of the oil and gas field industry. The influence of different sintering temperature on the microstructure, mechanical properties, and electrochemical corrosion performance of aluminum alloy materials for oil well pipes is investigated. The metal powder was weighed according to the experimental ratio and then poured into a ball milling tank. The vacuum was extracted with a vacuum pump and then mixed in an omnidirectional planetary grinder for 6 hours (at 300 r/min). The evenly mixed metal powder was pressed into green billets with an SHT4605 hydraulic servo drive control universal testing machine with a diameter of 25 mm at 300 MPa for 3 min. The formed billet was placed into a vacuum sintering furnace for sintering (at 500, 550, and 600 ℃, for 60 min at a heating rate of 10 ℃/min), with a sintering vacuum degree of 10 Pa. Finally, the furnace was cooled to obtain aluminum alloy samples. The aluminum alloy sample was cut with a metal wire. The cross section of the sample was polished and corroded by Keller reagent. The microstructure of the aluminum alloy was observed under a research level upright metallographic microscope of ZEISS SCOPE A (AXIO) 1. The density was measured with an ET-120HM multifunctional electron density tester and the phase structure was analyzed with a DX-2700 X-ray diffraction analyzer. The microstructure and elemental composition were observed and analyzed by scanning electron microscope (EVO MA15) with energy dispersive spectroscopy. The microhardness was measured by HVS-1000 microhardness tester and compressive strength was tested by SHT4605 hydraulic servo driven universal testing machine. The electrochemical corrosion performance of aluminum alloy in 3.5% NaCl solution was studied by measuring the alternating current impedance (EIS), potentiodynamic polarization curve (Tafel), and micro corrosion current with a CHI900C scanning electrochemical microscope. The aluminum alloy for oil well pipes with excellent performance was successfully prepared by powder metallurgy technology. The aluminum alloy has the highest density (91.11%) when the sintering temperature is 550 ℃. The main reinforcing phase is Al2Cu, which is uniformly dispersed and has small grains. At this temperature, it has the best comprehensive performance, with the hardness, compressive strength, self-corrosion potential and self-corrosion current of 48.63HV0.3, 663.09 MPa, −0.686 V, and 5.445×10−6 A/cm2, respectively. The corrosion rate is 0.185 mm/a. At the optimal sintering temperature, an excellent reinforcing phase structure can be formed. The distribution of Al2Cu reinforcement phase to a certain extent determines the properties of aluminum alloy. The dense structure, uniform distribution of reinforcement phase, and small and few pores can effectively improve the corrosion resistance of aluminum alloy. |
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