Effect of Contact Load on Tribological Behavior of Aluminum Alloy Drilling Riser
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摘要: 通过用7075铝合金销盘和G105钢销钉在UTM摩擦试验机上研究了的实验接触载荷对铝合金隔水管摩擦学性能的影响机理。结果表明:随着接触载荷增加,摩擦系数先大幅减小后略有增大;磨损率先缓慢下降再急剧上升;在10 ~ 30 N接触载荷下,主要磨损机制为磨料磨损;在50 N接触载荷下,主要磨损机制为氧化磨损;在70 N接触载荷下,主要磨损机制为分层磨损;50 N为由轻微磨损向严重磨损转变的临界载荷。研究证明了在铝合金隔水管的运用过程中,应该避免高载接触引发严重磨损而导致材料失效。Abstract: The effect mechanisms of contact load on the tribological properties of aluminum alloy drilling risers were studied on a UTM friction test machine with the physical experiments of 7075 aluminum alloy pin disks and G105 steel pins. Results showed that the friction coefficient decreases significantly and then increases slightly with the increasing of contact load. As the contact load increases, the wear rate declines slowly and then rises sharply. The main wear mechanism was the abrasive wear at the contact load of 10 ~ 30 N and the oxidative wear at a medium load of 50 N. While the contact load increases to 70 N, the main wear mechanism was the adhesive delamination. The critical load is 50 N for the transition of wear mechanisms from wild wear to severe wear. Therefore, for aluminum alloy drilling riser, it is suggested to avoid high-load contact which would cause severe wear and drilling riser failure.
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Key words:
- drilli ng riser /
- 7075 aluminum alloy /
- contact load /
- wear mechanism /
- tribological properties
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表 1 试验中使用的材料和润滑介质的质量分数
% 7075铝合金 G105钢 油基钻井液 w(Si) 0.075 w (C) 0.41 w (水) 30 w (Fe) 0.35 w (Si) 0.22 w (膨润土) 5 w (Zn) 5.28 w (Mn) 0.63 w (Cu) 1.92 w (P) 0.014 w (NaCl) 1 w (Mg) 2.66 w (S) 0.008 w (Mn) 0.093 w (Mo) 0.21 w (乳化剂) 4 w (Cr) 0.22 w (Cr) 0.82 w (加重剂) 3 w (Ti) 0.038 w (Ni) 1.38 w (Al) Bal w (Fe) Bal w (分散剂) 2 表 2 不同载荷下磨损表面EDS分析结果
位置 载荷/N 质量分数/% w(C) w(O) w(Mg) w(Al) w(Zn) 点1 10 0.55 9.28 1.98 81.75 6.44 点2 30 0.65 23.89 2.11 68.66 4.68 点3 50 0.49 30.28 1.75 63.06 4.41 点4 70 0.72 42.25 − 57.02 − 点5 70 0.18 6.23 2.27 84.62 6.70 -
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