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《Surface Technology》 2017-10
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Microstructure and Wear Resistance of Flap Tubing Anchor Pieces with Iron-based Alloy Layer

ZHANG Xu;DUAN Yong-qiang;HAN Xin-de;XIE Wei-yi;WANG Jian-ning;LIU Long;JI Bo-qing;Engineering Technology Research Institute,Huabei Oilfield Company;Development Business Unit,Huabei Oilfield Company;  
The work aims to increase wear resistance of flap tubing anchor pieces in screw pump tubing string,improve efficiency of oil production and reduce operation cost.An Fe-based alloy layer was prepared on 45# steel substrate by adopting flame spray welding technology.Hardness,microstructure and wear resistance of the coating were investigated by scanning electron microscope,X-ray diffractometer,hardness tester and reciprocating friction testing machine.Contrast test and economical analysis of friction coefficient and wear loss were done between cutting edge welding-on materials of flap tubing anchor pieces and the alloy layer.The Fe-based alloy layer and substrate realized metallurgical bonding.The microstructure of the alloy layer was mainly composed of primary carbides Cr_2C_3 and Cr_7C_3,borides Fe_2B,Cr_2B and CrB,as well as eutectic substrates γ-Fe(Ni,Cr,C,Si),α-Fe,Fe_3C,(Fe,Cr)_7C_3,Fe_(23)(B,C)_6 and Cr_(23)C_6.Average surface hardness of the alloy layer was 64.7 HRC,almost 50% higher than that of the welding-on materials.Friction coefficient of the alloy layer stayed at 0.6,nearly 17% lower than that of the welding-on materials.After wear weight loss experiment,wear weight loss of the alloy layer was about 2/3 of that of the welding-on materials.The economical analysis showed that: cost of this strengthening process was about RMB 6.8305 yuan,nearly the same as that of the welding-on materials.After welding Fe-based alloy layer,hardness and wear resistance of the flap tubing anchor pieces are increased significantly and the service life is extended effectively.This study provides a reliable basis for wear-resisting strengthening and repair of the flap tubing anchor pieces,and also theoretical and practical basis for surface strengthening of the other quick-wearing parts in the oil production technology.
【CateGory Index】: TE983;TG174.4
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