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- W2488962901 abstract "In The Great Hanshin-Awaji Earthquake, general yield brittle fractures were observed in beam-column connections of steel building frames. Among many influencing factors which affect general yield brittle fracture,it can be considered that fracture toughness has substantial effects. Some studies are making clear required toughness for base metal and weld metal, but general values are not proposed. Moreover, it seems that it is also important to pay attention to toughness decrease in weld heat affected zone (weld HAZ), because toughness decrease occurs in HAZs of mild steel. In Ref 1), relationship between toughness of simulated HAZs of the rolled for building structures (SN) and weld heat-input limit of SN steel were investigated, in an attempt to provide required toughness for HAZs. The relationships between increase of hardness value and toughness, and changes of microstructure after weld heat-input were also discussed. In this paper, 780N/mm 2 grade steels and yield strength steels are examined. The main results are summarized as follows. (1) The reduction of ductility in CGHAZ of HT780 by welding heat-input are almost same as general mild steels, SN400B and SN490B. (2) Even though chemical compositions are not so different, relationship between Charpy absorbed energies and equivalent heat-input are quite different to low yield strength steels. It is inadvisable to fix a type of low yield steel to main structures by welding. (3) The results of Charpy impact test of low yield are clearly divided into very high and very low because of their large grain size. So Charpy impact test is not appropriate for investigating ductility of low yield steels." @default.
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- W2488962901 date "2002-07-01" @default.
- W2488962901 modified "2023-09-27" @default.
- W2488962901 title "Welding heat input limit of 780N/mm (sup 2) grade steels and low yield strength steels based on simulated HAZ tests" @default.
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