Title :
Fracture toughness of partially welded joints of SUS316 stainless steel at 4 K by large bend-bar tests
Author :
Nishimura, A. ; Tobler, R.L. ; Tamura, H. ; Imagawa, S. ; Mito, T. ; Yamamoto, J. ; Motojima, O. ; Takahashi, H. ; Suzuki, S.
Author_Institution :
Nat. Inst. for Fusion Sci., Gifu, Japan
fDate :
7/1/1996 12:00:00 AM
Abstract :
SUS 316 stainless steel bars were partially welded and tested in 3-point bending to evaluate the effect of natural cracks on fusion zone toughness at 4 K. The specimens had a cross-section 87.5 mm×175 mm and were fractured in liquid helium using a 10 MN cryogenic mechanical testing machine. In two tests, unstable fracture occurred at maximum load and at critical stress intensity factors Kmax=227 and 228 MPa√m. Results indicate a high resistance to fracture initiation but no stable tearing. Therefore, no resistance to crack propagation may exist in a fusion zone at a weld root under cryogenic temperature
Keywords :
austenitic stainless steel; bending; fracture toughness testing; fusion reactor materials; fusion reactors; stellarators; superconducting magnets; welding; 10 MN cryogenic mechanical testing machine; 3-point bending; 4 K; LHD; SUS316 stainless steel; crack propagation; critical stress intensity factors; cryogenic temperature; fracture toughness; fusion energy machines; fusion zone toughness; large bend-bar tests; natural cracks; partially welded joints; stable tearing; superconducting magnet applications; unstable fracture; weld root; Chemicals; Composite materials; Cryogenics; Helium; Joining materials; Materials testing; Steel; Superconducting coils; Superconducting magnets; Welding;
Journal_Title :
Magnetics, IEEE Transactions on
