Localized microstructural characterization of a dissimilar metal electron beam weld joint from an aerospace component

HICC and HE are known to cause failures in aerospace components. Hydrogen embrittlement (HE)and Hydrogen induced cold cracking (HICC) are influenced by the local misorientation, microstructural evolution, recrystallization of grains, residual plastic strain and the resultant grain boundary characteristic distribution (GBCD) brought about by welding processes. It is vitally important to quantify the microstructural evolution, degree of residual plastic strain and determine the GBCD across dissimilar weld joints in order to assess the susceptibility of the weld joint to these phenomena. In this investigation a full microstructural characterization study was carried at various locations within and around a dissimilar weld joint of Pulse-plated Nickel and Inconel 718, taken from an aerospace component. Areas examined included the base metals, weld fusion zone and heat affected zones on both side of weld dissimilar joints, formed via electron beam welding. Scanning electron microscopy/electron backscattering diffraction was employed to measure the crystal orientation distribution, grain size distribution,, misorientation distribution, residual plastic strain, grain structure, GBCD of the dissimilar weld joint. Metallurgical examination was carried out using SEM on HAZ in IN718 to investigate the secondary phase precipitates due to welding process

シングルセル遺伝子発現解析を用いた老化細胞に関する研究

東京都立大

Migration of channel heads by storm events in two granitic mountain basins, western Japan: Implication for predicting location of landslides

journal articl

Human impacts on infilling rates of hollows in landslide-prone areas of western Japan: Estimation from radiocarbon dates and high-resolution DEMs

journal articl

19世紀フランスにおける法律詐欺と外国離婚の効果（1） : ボッフルモン事件に対する法制史的考察

2014-06-25departmental bulletin pape

アンシャン・レジームにおけるプロテスタントの婚姻（二・完） : フランス婚姻法の法制史的研究

2011-09-24departmental bulletin pape

19世紀フランスにおける法律詐欺と外国離婚の効果（2・完） : ボッフルモン事件に対する法制史的考察

2014-09-25departmental bulletin pape

アンシャン・レジームにおけるプロテスタントの婚姻（一） : フランス婚姻法の法制史的研究

2011-06-25departmental bulletin pape

〈Research Reports〉Topographic characteristics of rainfall-induced shallow landslides on granitic hillslopes: A case study in Hofu City, Yamaguchi Prefecture, Japan

Heavy rainfall on July 21, 2009 caused many shallow landslides in Hofu City, western Japan. This paper reports topographic characteristics of shallow landslides in two areas: Yahazugadake area underlain by granodiorite (Gd area) and Tsurugi-kawa area underlain by granite (Gr area). Landslide density (numbers/area) of Gr area was much higher than that of Gd area. For both areas, the landslides had local slopes of 17–46 degrees and specific contributing areas (i.e. drainage area divided by landslide width) of 11–560 m, and there was a weak inverse correlation between local slope and specific catchment area. The landslides in Gd area have steeper local slope and larger specific contributing area than those in Gr area. Field and laboratory measurements of soil properties revealed that the Gr area has thinner soil and higher shear strength for slip plane. Differences in shear strength as well as the hydrological characteristics due to contrasting soil depths are the possible causes of contrasting landslide densities between Gr and Gd areas