Effect of weld thermal cycles on the HAZ toughness of SQV-2A pressure vessel steel
- Osaka Univ., Ibaraki, Osaka (Japan). Welding Research Inst.
The toughness of coarse grained heat affected zone (CGHAZ) and intercritically reheated CGHAZ of SQV-2A pressure vessel steel has been investigated with particular attention to the behavior of M-A constituents. The effect of temper-bead thermal cycles on the toughness improvement in ICCGHAZs and temper-bead process. The occurrence of embrittlement in CGHAZs and ICCGHAZs was accompanied by the formation of the M-A constituent. Observations with a scanning electron microscope (SEM) showed that the M-A constituent acted as an initiation site of cleavage facets or secondary cracks. Temper-bead thermal cycles could improve the toughness of ICCGHAZs due to the decomposition of M-A constituents, but the toughness improvement by the temper-bead thermal cycle was influenced strongly by the cooling time {Delta}t{sub 8/5(2)eff} of the second thermal cycle. For short cooling time {Delta}t{sub 8/5(2)eff}, namely for low welding heat-input, the toughness improvement was significant.
- OSTI ID:
- 442982
- Report Number(s):
- CONF-950682-; ISBN 0-87170-567-2; TRN: IM9712%%407
- Resource Relation:
- Conference: 4. international conference on trends in welding research, Gatlinburg, TN (United States), 5-9 Jun 1995; Other Information: PBD: 1996; Related Information: Is Part Of Trends in welding research: Proceedings of the 4. international conference; Smartt, H.B.; Johnson, J.A. [eds.] [Idaho National Engineering Lab., Idaho Falls, ID (United States)]; David, S.A. [ed.] [Oak Ridge National Lab., TN (United States)]; PB: 836 p.
- Country of Publication:
- United States
- Language:
- English
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