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通过宏观观察、理化性能检测、显微组织和断口形貌分析,对35CrMoA抽油杆扳手方失效原因进行了分析。结果表明:抽油杆扳手方的失效形式为典型的腐蚀疲劳断裂,疲劳源位于抽油杆表面腐蚀坑处。腐蚀产物中除含有大量Fe的氧化物外,还有较多的硫化物和各种盐类物质;抽油杆扳手方的显微组织主要为回火索氏体+铁素体。腐蚀坑易于产生疲劳裂纹,裂纹沿硫化物及带状组织扩展,最终导致腐蚀疲劳失效。最后,提出了减少同类抽油杆断裂失效发生的措施。
Through the macroscopic observation, the physical and chemical properties testing, the microstructure and the fracture surface morphology analysis, the failure reason of the 35CrMoA sucker rod wrench side was analyzed. The results show that the failure mode of sucker rod wrench is a typical corrosion fatigue fracture, and the fatigue source is located at the corrosion pits on the sucker rod surface. In addition to the corrosion products containing a large amount of Fe oxide, there are more sulfide and various salts; sucker rod wrench side of the microstructure mainly tempered sorbite + ferrite. Erosion pits are prone to fatigue cracks, which propagate along the sulfide and ribbon structure, eventually leading to failure of corrosion fatigue. Finally, the measures to reduce the occurrence of fracture failure of similar sucker rods are put forward.