含窒素熔着鋼の脆性破壊部の微視的観察

スポンサーリンク

概要

論文の詳細を見る
Charpy specimens of mild steel weld metals containing comparatively large nitride precipitates were fractured by impact bending at various temperatures within the so-called transition temperature range. The lattice distortions in the brittle fractures were surveyed by the X-ray back diffraction method. Angular correlations among fractured edges, nitride needles and slip lines, generated by static compression independently of the rupture, were measured statistically with micro-photographs. From these observations, the following conclusions were obtained : 1. The fractures, which look similarly brittle to the naked eye, actually have different degrees of lattice distortions corresponding to the testing temperature. 2. X-ray back reflection photography is useful for comparing brittleness of these fractures. 3. Crystallographic plane of cleavage fractures could not be hastily decided to be a {001} plane, but it was ascertained to be one of {h01} planes, in which h is an integer or zero. 4 Nitrides in weld metals inhibit plastic flow. They contribute to stress concentration and reduce the cohesive strength of ferrite crystals, thereby promoting brittle fracture.
社団法人溶接学会の論文

著者

小林卓郎
名古屋大学工学部

関連論文

もっと見る

スポンサーリンク