Failure Analysis Case History No. 008

Industry: Oil & Gas
Specimen Description: Downhole Motor Transmission Coupling
Material: AISI 9310
Environment: Drilling Mud
Background:
A downhole motor failed while drilling at 3300 meters. Inspection revealed that two female AISI 9310 case hardened couplings in the ball drive shaft had fractured. Corrosion was evident on the coupling and the fracture.
Time in Service: Hours
Findings:
Laboratory analysis showed that the couplings had experienced several types of damage, including pitting corrosion, fatigue and hydrogen embrittlement cracking. The maximum case hardness measured 675 HK, while the core hardness was 29 HRC.

 

Contact Us

If you have questions or need our depth of experience to help with your issues...

Call us: 281-556-8774

Email us: info@hghouston.com

News

The safe operation of oil refineries in the United States is under constant r...read more
When: January 30, 2017 - February 2, 2017 Where: Galveston Island Conventi...read more

View all articles

Stay Current

Sign up for our quarterly newsletter

covering updates on corrosion