著者
佐々木 康 石井 邦宜
出版者
社団法人日本鉄鋼協会
雑誌
鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)
巻号頁・発行日
vol.88, no.8, pp.419-429, 2002-08
被引用文献数
1

Molten silicate and aluminosilicate slag structures have been reviewed based on the recent experimental results measured by such as Raman spectroscopy, high temperature NMR, high temperature X ray analysis. The structures of these melts discussed in this review may be summarized as follows : The anionic structure of alkali and alkaline earth oxide-silica binary melts can be considered a mixture of a small number of coexisting anionic units. In terms of stoichiometric expression, these units are described as SiO^<4->_4, Si_2O^<6->_7, SiO^<2->_3, Si_2O^<2->_5 and SiO_2 units. High temperature NMR studies have made it clear that the structures of anionic units are not lasting, but exchange their structures each other very rapidly at high temperature. The structure of aluminosilicate melts is consistent with tetrahedrally coordinated Al^<3+> provided that there is a sufficient supply of metal cations for electrical charge-balance. Electrical charge-balanced alkali aluminosilicate melts consist of three-dimentionally interconnected 6-membered rings of Si and Al tetrahedral units that mix randomly. Electrical charge-balanced alkaline earth aluminosilicate melts probably consist of mixtures of three-dimentionally interconnected rings with no Al^<3+> (six-membered SiO_2-ring), rings with Al/Si=1 (four-membered Al_2Si_2O^<2->_8 rings) and rings with no Si^<4+> (six-membered AlO^<2-> ring). In most Fe bearing silicate melts, ferrous iron is a network modifier (octahedral coordination) while ferric iron works both as a network former (tetrahedral coordination) and as a modifier depended on the slag compositions. Melts along the Na_2SiO_3-NaFeSi_2O_3 (acmite) joins become progressively more polymerized as Fe^<3+> content of the system increases and the end component of acmite melts has a three dimensional network structure.
著者
和佐 泰宏 岡本 陽
出版者
社団法人日本鉄鋼協会
雑誌
鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)
巻号頁・発行日
vol.90, no.11, pp.877-882, 2004-11-01

An automatic ultrasonic inspection system for crank throws of built-up type crankshaft has been developed. Several kinds of UT-probe for each part of throw are used to detect faults in important area. Probe scanning technology with proper contact force and noise eliminate technology are newly developed, so that the stable inspections for all types of throws are realized.
著者
鑓田 征雄 伊藤 正登
出版者
社団法人日本鉄鋼協会
雑誌
鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)
巻号頁・発行日
vol.94, no.10, pp.391-398, 2008-10-01
被引用文献数
3 3

The temper rolling is applied to eliminate the stretcher strain, to improve the flatness and to control the surface roughness of rolled-sheet as the finishing process in cold rolling. However, there are some problems remain in analysis of the temper rolling. The classical rolling theory based on the rigid plastic theory, can not deal with non-uniform elastic-plastic deformation in the thickness direction, because the deformation is partly concentrated on the surface layer of the sheet. This paper presents an elastic-plastic finite element analysis of stress and strain behaviors in plane strain temper rolling for as-annealed mild steel sheet. In the analysis, the upper yield stress, the lower yield stress and yield point elongation are taken into account for the stress-strain relation of material rolled. For the contact boundary between roll and deforming material, both slipping and sticking are considered, and the Coulomb friction law is employed to represent the slipping friction. Furthermore, calculated rolling force by the EP-FEM is compared with that by the classical rolling theory as Karman's equation and that obtained by a laboratory scale rolling experiment with bright rolls or dull rolls. As the results, in the case of small friction between roll and deforming material, the rolling force obtained by Karman's equation coincide with that by EP-FEM and that by experiment.

1 0 0 0 OA 余徳

著者
酒井 佐敏
出版者
社団法人日本鉄鋼協会
雑誌
鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)
巻号頁・発行日
vol.47, no.6, pp.793-794, 1961-06-01
著者
津田 正臣
出版者
社団法人日本鉄鋼協会
雑誌
鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)
巻号頁・発行日
vol.81, no.5, pp.589-594, 1995-05-01
被引用文献数
1

Effect of B addition (B≦0.012%) on the cold rolling and recrystallization textures of Fe-36%Ni alloy has been studied. The {001} <110> preferred orientation, which is increased with increasing B contents, developes in the surface layer. The surface rolling texture penetrates from the surface to a depth of less than about 20μm. The pure-metal type rolling texture of {4 4 11} <11 11 8> which is found in the inner layer, irrespectively of B contents. The surface recrystallization texture of B containing alloys is almost random. The inner recrystallization texture showes a gradual change with increasing B contents from the {100} <001> orientation to the {4 4 11} <11 11 8> orientation of rolling texture which is retained after completion of recrystallization.