溶接部の熱ひずみぜい化感受性(<特集>溶接部の組織とじん性)

概要

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The susceptibility of weldments to hot straining embrittlement has been examined in detail. Three points bend specimens were extracted from the welded joints of HT80 and SM50 steels. Then sharp notch was accurately machined on fine grained HAZ, coarse grained HAZ, weld metal and base metal in each other. After machining the notch, one groupe of specimens was bended at 250℃ to receive the saturated hot straining embrittlement, and then they were tested at temperature of interesting by measuring critical crack opening displacement to fracture. For the case of the weldments of HT80,hot strained coarse grained HAZ showed the highest transition temperature in the weldments (fine grained HAZ, coarse grained HAZ, weld metal, base metal). For the cae of the weldments of SM50,weld metal and coarse grained HAZ showed nearly same degree of hot straining embrittlement and these regions showed higher transition temperature than base metal and fine grained HAZ, when they received saturated damage.
1981-01-05