Mechanicl relaxation response of 2 1/4 Cr-1 Mo steel
Conference
·
OSTI ID:6346792
The mechanical relaxation of 2 1/4 Cr-1 Mo steel was examined in the temperature range 450 to 566/sup 0/C for times to 100 h. Data from four heats were included. The relaxation strength was found to vary with heat treatment by a factor of three from the weakest to the strongest. The extent of recovery and tempering that occurred during relaxation was displayed by means of isochronous stress vs strain curves constructed from multiple loading tests. Recovery of the yield strength during relaxation was observed at temperatures as low as 538/sup 0/C. Relaxation response after cyclic strain was examined and found to be identical to response after monotonic strain providing that the starting stress was at the tip of the hysteresis loop. At other positions within the hysteresis loop the relaxation responses was influenced by the direction of the prior inelastic strain. The salient features of the relaxation response were consistent with expectations based on a material deformation model that included parameters to accommodate kinematic and isotropis hardening. 17 figures.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6346792
- Report Number(s):
- CONF-810741-1; ON: DE81027301
- Country of Publication:
- United States
- Language:
- English
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