From: Phil Heitzenroeder Sent: Friday, June 25, 2004 11:24 AM To: Wayne T. Reiersen Subject: FW: elastic modulus of "316" casting -----Original Message----- From: Phil Heitzenroeder Sent: Friday, June 25, 2004 11:23 AM To: David Williamson (xdw@ornl.gov); Brad Nelson (ban@ornl.gov) Cc: 'rpreed@comcast.net' Subject: FW: elastic modulus of "316" casting David, Brad- Dick brought this info to our attention (thanks,Dick!). Unfortunately we did't require the modulus to be measured for the prototypes, but we do have it in the production spec. (requirement: 200 GPa at 77k; 190 Gpa at RT). Perhaps I should get specimens made and tested from the EIO bar that I have. Phil -----Original Message----- From: rpreed@comcast.net [mailto:rpreed@comcast.net] Sent: Friday, June 25, 2004 10:45 AM To: Leonard Myatt Cc: Phil Heitzenroeder Subject: elastic modulus of "316" casting Len, In looking over elastic modulus data for 316-like cast alloys for Phil's specifications, I came across data from ITER (EU/KfK) that is very discouraging. I list the values that were reported for the elastic modulus at 7 K (tested in helium gas) and 4 K (liquid helium): 25 ton casting orientation = "Y" 124-179 GPa orientation = "X" 162-176 GPa orientation = "Z" 168-214 GPa 1 ton casting, one orientation 4 mm diameter specimen 148-176 GPa 6 mm diameter specimen 126-190 GPa 12 mm diameter specimen 170 GPa 20 mm diameter specimen 113-158 GPa wrought 316LN alloy all orientations 192-211 GPa Source: A. Nyilas, et al, European Cryogenic Material Testing Program for ITER Coils and Intercoil Structures, Advances Cryogenic Engineering- Materials, vol 48 (2002), AIP Press, pp 123-130. I do not know if this very large variability is caused by measurement inconsistencies, grain size and orientation variabilities, flaws, or ferrite variability. Also, the chemistry is different from ours; their alloy contains more Mn, N, and Mo. However, the chemical variations should not account for the variations in the elastic modulus. The relative tightness of the wrought data suggest that the variations are due to metallurgical factors These data do suggest that the values that I provided you for the wrought ITER 316LN are too high. Maybe, until we obtain data on our casting, a modest "sensitivity study" is in order to assess the effects of possible variations of the elastic modulus of up to 50%. Dick Reed