圧力技術
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
39 巻, 4 号
選択された号の論文の4件中1~4を表示しています
<論文>
  • 平木 邦弘, 佐藤 進
    原稿種別: その他
    専門分野: その他
    2001 年 39 巻 4 号 p. 194-203
    発行日: 2001年
    公開日: 2003/01/31
    ジャーナル フリー
    At present, during the process of machining the cast iron, many chips have been produced. These chips are abolished except recycle using. However, considering the effective conservation of material resources, the recycle of these cast iron chips is a matter of the utmost concern.
    In this paper, recycle method applying to the thermal spraying is newly proposed for the ductile iron chips JIS-FCD450. Namely, by crushing and arranging these ductile iron chips, it is possible to make use of them for the thermal spraying powder. Obtained results are summarized as follows.
    (1) Since the crushed powder was flat and thin in shape, it was well melted under gas flame spraying process in comparison with the conventional powder.
    (2) Microstructure of the gas flame sprayed coat made from the crushed powder was constructed with piled up thin layers and had fewer blowholes than the conventional coat.
    (3) When the carbon was removed from the surface of the crushed powder by ultra sonic wave, substrate/coat interface strength changed to higher than that of the conventional coat regardless of powder size.
  • 高木 勉
    原稿種別: その他
    専門分野: その他
    2001 年 39 巻 4 号 p. 212-221
    発行日: 2001年
    公開日: 2003/01/31
    ジャーナル フリー
    For equipment and pipes operated under coal slurry, many papers about the material evaluation have been reported. In comparison with the petrochemical plant, material selection considering to the severer conditions is required. In the previous papers, the material evaluation results have been reported in coal liquefaction unit of 150t/d Bituminous coal liquefaction pilot plant (herein after PP). In consideration of the studying properties of PP, the materials have been selected for the design of PP Through this inspection, it was confirmed that the material selection was, basically, suitable for PP. In this paper, for the minimizing the troubles based on the damage of materials, material selection guide was suggested from the viewpoint in the practical use of coal liquefaction commercial plant. Basically, the suitable materials are selected, and it is necessary to discuss the several treatment such as heat treatment, protection treatment at the shutdown period of plant, the restriction of velocity of fluid and the addition of corrosion inhibitor.
<講座>
  • 高屋 茂, 宮 健三
    原稿種別: その他
    専門分野: その他
    2001 年 39 巻 4 号 p. 224-237
    発行日: 2001年
    公開日: 2003/01/31
    ジャーナル フリー
    In the first part of this paper, some studies about the relationship between degradation and magnetic quantities of ferromagnetic materials are reviewed. These studies show some magnetic quantities like magnetic susceptibility, coercive force and saturated magnetization could be parameters to evaluate degradation effectively. Plastic deformation regions can be detected by a SQUID or a Hall sensor. Then, studies about non-ferromagnetic materials are also reviewed. The first one is the study about the change of the magnetic flux leakage due to mechanical loading. This shows the relationship between plastic deformation and change of magnetic flux leakage. The second one is observation results by magnetic colloid and Magnetic Force Microscope (MFM). Magnetic flux density of the sample was changed depending on load. It is realized that periphery of a crack introduced by a cyclic loading was magnetized and magnetization is caused by martensitic transformation. The last one is the inverse analysis method using Neural Networks to predict distribution of magnetization in a sample from magnetic flux density. The validity of this method is confirmed because the magnetic flux density calculated using the magnetization analyzed inversely coincides to the observation results. The possibility that magnetic physical quantities can be parameters of degradation levels is shown by these studies.
<解説>
  • 喜田 裕
    原稿種別: その他
    専門分野: その他
    2001 年 39 巻 4 号 p. 238-253
    発行日: 2001年
    公開日: 2003/01/31
    ジャーナル フリー
    Low temperature hydrogen damage of carbon and micro-alloyed steels can occur in aqueous environments containing hydrogen sulfide which are commonly observed in petroleum refineries and in oil and gas transportation pipelines. These damage mechanisms have been reported to include sulfide stress cracking (SSC), hydrogen-induced cracking (HIC), and stress oriented hydrogen-induced cracking (SOHIC). In addition, stress corrosion cracking of carbon steel weldments has been identified in amine units to remove acid components such as hydrogen sulfide and carbon dioxide from gas and liquid hydrocarbon stream in gas processing plants, refineries, and petrochemical plants. In this report, published information on the past experiences of hydrogen damage of carbon and micro-alloyed steels in aqueous environments containing hydrogen sulfide has been reviewed. As a result, it is revealed that a potential risk for occurrence of the damage in newly fabricated equipment has been significantly degreased owing to the steel making practice to produce highly purified and very clean steel products. Furthermore, it is highlighted that a lot of technical standards providing guidelines to mitigate the damage have been established for new fabrication as well as existing equipment in the last decade.
feedback
Top