Hydrogen embrittlement behavior of friction stir welded high carbon steel
- Sun Y.F. ,
- Fujii H. ,
- Ueji R. ,
- et al
- Sun Y.F. ,
- Fujii H. ,
- Ueji R. ,
- Morisada Y. ,
- Imai H. ,
- Kondoh H. and
- Khodir S.
Repository
Description
A cathodic hydrogen charging method was employed to investigate hydrogen embrittlement in the parent metal and stir zones of friction stir welded SK4 high carbon steel (0.95%C, 0.42%Mn, 0.15%Cr) sheet specimens (thickness 2 mm). Welding was conducted by a stir-in-plate method using a load-controlled FSW machine at a travel speed of 100 mm/min and rotational speeds of 120-400 rpm. After welding, dog-bone like tensile specimens and rectangular specimens were cut by electrical discharge machining and subjected to cathodic hydrogen charging at room temperature. Microstructures were observed by optical microscopy, SEM and TEM. Mechanical properties were characterised by tensile tests and fracture surface observations. Issues discussed include the reduced hydrogen embrittlement sensitivity of the stir zone compared with the parent metal and crack formation in the twin martensite structure.
10th International Symposium, 20-22 May 2014, Session 10B: High Temperature, Paper 05
Related Records
