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An investigation on the weldability of a quenched and tempered 9% Ni-steel, using weld simulation and artificial aging to estimate the heat affected zone (HAZ) ductility at cryogenic temperatures is reported in the first part of this paper. A series of large scale tensile tests have also been carried out on 9% Ni butt welds, the results of which are presented in the second part. Charpy-V bars were subjected to various weld simulation cycles and subsequent heat treatments and after notching broken at a range of cryogenic temperatures. The simulated welding heat in general, even where varied between wide limits, causes a decrease in impact properties of the steel, although they are still acceptable even at the very lowest test temperatures (-196C). Severe embrittlement can result from artificial aging, such as a plastic deformation followed by heating in the 200-400C temperature range. This suggests that care must be taken when cold deformation is used or distortions are corrected in structures made of 9% Ni-steel.

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Published: 1982 Number of Pages: 24 File Size: 1 file , 1.3 MB