INFLUENCE OF BORON ON PRE- AND POST IRRADIATION PROPERTIES OF TYPE 304 STAINLESS STEEL AND WELD METAL
Experimental heats of 2 wt% natural boron modified Type 304 stainless steel incorporating scrap from a commercial heat of the alloy, which failed to convert to sheet product, established the necessity of maintaining minimum manganese and silicon contents. When chemical composition is controlled, boron containing Type 304 stainless steels can be converted to sheet products which are formable. Severe embrittlement of the base metals was found after a total integrated exposure of 20 x 10/sup 20/ nvt (thermal). Losses of resistance to impact, in miniature specimens were: over 64% in stainless steel Type 304, and, over 90% in both the 1 and the 2 wt% boron stainless steels. A 1-hr 900 deg F tempering heat treatment restored resistance to impact in Type 304 stainless steel but not in the 1 and 2 wt% boron stainless compositions. Impairments of resistance to impact, attributed to contamination by boron, were found in the as- welded Type 308 stainless weld metal joining plates of boron-stainless steel Type 304. Weld metal resistance to impact was reduced by irradiation to a common value of three ft-lb for the four welded plate combinations. Resistance to impact in unirradiated weld metal was restored by both the 1-hr 900 deg F tempering and the 1-hr 1950 deg F solution annealing thermal heat treatments. The 1-hr 900 deg F tempering and 1-hr 1950 deg F solution annealing heat treatments were either ineffective or completely embrittled the irradiated welds. Elevated temperature thermal heat treatments revealed that the irradiated boron stainless steels swelled in one hour at temperatures above 1300 deg F. (auth)
- Research Organization:
- Argonne National Lab., Ill.
- DOE Contract Number:
- W-31-109-ENG-38
- NSA Number:
- NSA-16-030910
- OSTI ID:
- 4782071
- Report Number(s):
- TID-12047; UAC-4669
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- United States
- Language:
- English
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