Postweld Heat Treatment Effects on Annealed 2 1/4 Cr-1 Mo Steel
- Oak Ridge National Laboratory (ORNL)
The tensile properties of four heats of 2 1/4 Cr-1 Mo steel were determined over the range 25 to 566{sup 0}C at strain rates of 2.67 x 10{sup -6} and 6.67 x 10{sup -4}/s after the heats were given a simulated postweld heat treatment (PWHT) for various times at 727{sup 0}C. An annealed vacuum-arc-remelted (VAR) plate was tested after 0, 1, 5, 16, and 40 h at 727{sup 0}C. An isothermally annealed electroslag-remelted (ESR) rod and an air-melted plate were tested after 0 and 40 h at 727{sup 0}C. An isothermally annealed air-melted forging was tested after 0, 16, and 40 h at 727{sup 0}C. The simulated PWHT decreased the yield strength (YS) and ultimate tensile strength (UTS) and increased the ductility of all heats. For the VAR plate the decrease in strength continued up to the 16-h exposure at 727{sup 0}C; no further change occurred between 16 and 40 h. The VAR plate, the air-melted plate, and the ESR rod did not differ significantly in strength after 40 h at 727{sup 0}C. For this same exposure, the air-melted forging was significantly stronger than the other three steels. After 40 h at 727{sup 0}C, the room-temperature YS and UTS of all heats exceeded the 207- and 413-MPa minimum values required by ASME specifications. However, at elevated temperatures, all but the air-melted forging had a YS that fell below the expected minimum curve given in ASME Code Case N-47. The effect of PWHT on properties was explained in terms of precipitate strengthening. 17 figures.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725;
- OSTI ID:
- 711231
- Report Number(s):
- ORNL--5615
- Country of Publication:
- United States
- Language:
- English
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