粒子分散強化鋼における粒子形状と粒子サイズ分布を考慮した粒子数密度の評価

摘要

The number density of particles was estimated regarding to the high strength steels containing non-spherical shaped precipitates with various size. The shapes of particles were evaluated by modeling based on the experimental results obtained by transmission electron microscopy. When the spatial degrees of freedom of particle size were restricted to two-dimensions, the effect of particle yize distribution on the number density became relatively small compared to the case of the three spatial degrees of freedom. This finding suggested that the number density might be obtained from the mean particle size. It was noted that the effect of size deviation could be negligible when the particles were platelet-shaped and their thickness was assumed to be constant.%粒子分散強化は，材料中に転位運動の障害となる粒子をrn多数分散させることで材料の降伏応力を増大させる強化法rnである。その強化量を定量的に求めるには，分散粒子のサrnイズ，剛性率，分散粒子と母相との間の格子整合性等に加rnえて，粒子の数密度を正しく知ることが重要である。