Effects of Stress-Relieving Heat Treatment on the Brittle Fracture Initiation in Welded Structures

概要

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Effects of stress-relieving heat treatment on brittle fracture initiation in welded structures are quantitatively discussed in terms of fracture mechanics. The basic concept employed for discussion is that brittle fracture should initiate when tensile yield zone formed ahead of a pre-existing crack attains a critical size depending on the material. The critical zone size as a function of temperature is predictable from Charpy-V transition temperature. Metallurgical information on welding residual stress and Charpy-V data for various conditions of heat treatment is compiled and put into the proposed logical framing of fracture mechanics. There is a divergence of conclusion for every case of steel type. Cases studied are those of an ordinary mild steel, two kinds of quenched-and-tempered high strength steels and a Mn-Mo steel for nuclear pressure vessels.
社団法人日本船舶海洋工学会の論文