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The effect of an intended change of heat input during welding on the fracture behaviour of the steels 20 MnMoNi 5 5, 15 MnNi 6 3 and StE 460 TM was studied. SA-weld-joints were prepared with a range of cooling times from 20 to 50s. The fracture behaviour of the different HAZs, weld metals and base materials was investigated by tests on Charpy-V notch bar impact, fracture mechanics, medium scale tension and wide plate specimens. The three steels showed a decrease of toughness properties with an increase of cooling time within the range from 20 to 50s. A stress relief heat treatment resulted mainly for 15 MnNi 6 3 steel in an improvement of toughness behaviour. Comparisons of characteristic transition temperatures of the different tests showed a good correlation between temperature determined by fracture mechanics samples, and temperature determined by wide plates of the same thickness. Fracture mechanics data were used to evaluate the maximum allowable loads or the instability loads for all tested wide plates.

Additional information

Authors: HEUSER A, R.W.T.H. Aachen, Institut fur Eisenhuttenkunde (DE)
Bibliographic Reference: EUR 11492 DE (1988)
Availability: (2)
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