著者

中江 秀雄

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.85, no.8, pp.534-541, 2013-08-25 (Released:2018-01-01)

参考文献数

14

著者

堀川 紀孝 王 麟

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.91, no.12, pp.850-855, 2019-12-25 (Released:2020-01-01)

参考文献数

13

---

The microstructure and mechanical properties of ductile cast iron are affected by the chemical compositions and thickness of casting products. Thus, a nondestructive estimation method for casting is required. This research investigated effects of casting surface on the eddy current evaluation of ductile cast iron matrix. Ductile cast iron specimens having various microstructures were prepared by adding alloy elements and varying the thickness. One of the surfaces of the specimen was machined by face milling, and annealed after machining. Eddy current testing and microstructure observation were performed on both the machined surface and casting surface. Pearlite ratio showed good correlation with the eddy current signals measured on the machined surface. Similar correlation was obtained by measurement on the casting surface. However, the eddy current signal was affected by the casting surface. The influence of surface roughness and pearlite ratio on the eddy current signal differed according to the signal component. Selecting the signal components enables the effects of the surface roughness to be reduced. The effects of the testing frequency were also examined, and the results showed that the variation in the correlation between the eddy current and the pearlite ratio increased at lower and higher testing frequencies than 1 to 5kHz. Comparison of the correlations between the pearlite ratio and eddy current signals obtained by measurements on the machined surface and the casting surface showed that of the casting surface tends to have low pearlite ratio, due to the effects of the microstructure transient layer beneath the casting surface. Thus, it can be suggested that choosing a suitable testing frequency and an eddy current signal component enables the estimation of the matrix of ductile cast iron by eddy current testing regardless of the surface conditions.

著者

栗熊 勉 鬼頭 正博 秋田 憲宏

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.71, no.2, pp.121-126, 1999-02-25 (Released:2014-12-18)

参考文献数

10

著者

西中 一仁

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.76, no.6, pp.494-498, 2004-06-25 (Released:2015-01-10)

参考文献数

4

著者

菅野 利猛

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 全国講演大会講演概要集 第150回全国講演大会講演概要集 (ISSN:18805388)

巻号頁・発行日

pp.72, 2007 (Released:2017-08-15)

著者

真鍋 健一

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.71, no.12, pp.811-817, 1999-12-25 (Released:2014-12-18)

参考文献数

15

著者

杉山 明 安田 秀幸 柳楽 知也 吉矢 真人 上杉 健太朗 梅谷 啓二 大中 逸雄

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 = Journal of Japan Foundry Engineering Society (ISSN:13420429)

巻号頁・発行日

vol.83, no.3, pp.131-136, 2011-03-25

参考文献数

11

被引用文献数

1

---

It is well known that controlling the graphite shape in cast iron is a critical issue to achieve appropriate properties. It is of interest to know how the microstructure in cast iron evolves during solidification. So far, time-evolution of the microstructure has not been observed in-situ. This paper presents the in-situ observation results of cast iron solidification using X-ray imaging of synchrotron radiation. Transmission X-ray images with a spatial resolution of as small as 5<i>μ</i>m were obtained by an X-ray detector SATICON in an imaging beam line 20B2 at SPring-8. A 10 × 10 × 0.1mm specimen was melted and solidified in a mold made of Al₂O₃ placed in a vacuum chamber. The observation showed that the solidification started with austenite dendrites, after which the eutectic structure was formed. Graphite clusters of about 100<i>μ</i>m in diameter were formed in the remaining liquid surrounded by the eutectic structure at a cooling rate of less than 10K/min. At a cooling rate of 10K/min, the primary dendrite and the eutectic grains moved up and down, respectively, due to the bouncy force.

著者

河村 真一 桃野 正 田湯 善章

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 全国講演大会講演概要集 第161回全国講演大会講演概要集 (ISSN:18805388)

巻号頁・発行日

pp.163, 2012 (Released:2017-03-01)

著者

辻 和也 梶川 浩

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 = Journal of Japan Foundry Engineering Society (ISSN:13420429)

巻号頁・発行日

vol.76, no.12, pp.1009-1013, 2004-12-25

参考文献数

5

被引用文献数

1

著者

西 直美

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.80, no.2, pp.120-126, 2008-02-25 (Released:2015-01-13)

参考文献数

11

著者

寺西 英之

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 全国講演大会講演概要集 第150回全国講演大会講演概要集 (ISSN:18805388)

巻号頁・発行日

pp.80, 2007 (Released:2017-08-15)

著者

野口 徹 鴨田 秀一

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.70, no.12, pp.920-927, 1998-12-25 (Released:2014-12-18)

参考文献数

15

被引用文献数

4

著者

飯島 伸介 中山 勝也 西村 育夫 霜田 浩 片桐 猛

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.82, no.1, pp.29-37, 2010-01-25 (Released:2015-04-21)

参考文献数

27

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In the present work, a real plant of a regenerative thermal oxidizer (RTO) was applied to treat odor constituents from shell mould castings. As a result, it was found that concentrations of ammonia were about 20ppm, which is higher than that of other odor constituents in exhaust gas from shell mould castings. However, o- and p- cresol contained in the exhaust gas were found to highly contribute to offensive odor more than ammonia due to their low olfactory threshold, and the odor index of the exhausted gas was 40.   As a result of the treatment of the exhausted gas by the RTO, about 99.7% and 99.5% of the o- and p- cresol was decomposed, and the odor index of treated gas decreased from 40 to 21, which is lower than the regulation value in the offensive odor control act. Thus, it can be concluded that the RTO is suitable for decreasing odor constituents from shell mould castings.   The material balance of the RTO used for the real plant was calculated by using average values of operating data for 24hours. As a result, 92.4% of thermal efficiency was obtained, which results in higher energy savings than that of typical combustion processes.   In order to prevent tar adhesion which contributes to offensive odor and to the obstruction of regenerative heat exchanger in the RTO, a stainless filter and pre-heating system were introduced to the RTO. As a result, it was found that pressure loss of the RTO was almost the same as 1.8kPa for 400h. Subsequently, the regenerative heat exchanger was heated up to 623K by means of baking treatment, and it was found that tar was more or less completely removed from ceramic honeycombs in the regenerative heat exchanger.

著者

西 直美

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 = Journal of Japan Foundry Engineering Society (ISSN:13420429)

巻号頁・発行日

vol.78, no.8, pp.413-421, 2006-08-25

参考文献数

13

著者

山田 隆介 戸田 裕之 竹内 晃久 ベーゼル 靖子

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.89, no.1, pp.10-16, 2017

---

<p>  A single-distance phase retrieval technique was applied to the contrast-enhanced phase-sensitive imaging of micro segregation in die-cast aluminum alloy. Contrast between regions with and without micro segregation, spatial resolution and signal-to-noise ratio were evaluated to clearly differentiate micro segregations whose density difference from the matrix aluminum is small, making it difficult to visualize and differentiate them using ordinary absorption-contrast imaging. Since spatial resolution more or less drops during the phase retrieval process, a combination of the high-contrast phase-contrast imaging and the high-resolution absorption-contrast imaging was applied to reveal 3D microstructure/fracture relationship in an in-situ tensile test. Each phase-contrast image was registered with a corresponding absorption-contrast image to examine the positional relationship between the fracture path and micro segregation. A sectioning technique was also applied to identify the source of density difference. The results confirmed that three-dimensionally connected bands of micro segregations provide a preferential path for fracture in the die-cast aluminum alloy investigated. The observations suggest that the control of the 3D spatial distribution of micro segregation bands is of crucial importance for enhancing mechanical properties effectively even if its elimination is physically difficult.</p>

著者

杉山 明 前川 裕貴 後藤 耕太 山根 功士朗 安田 秀幸 吉矢 真人 柳楽 知也 牛込 智章 佐藤 彰洋 梅谷 啓二 上杉 健太朗

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 全国講演大会講演概要集 第161回全国講演大会講演概要集 (ISSN:18805388)

巻号頁・発行日

pp.13, 2012 (Released:2017-03-01)

著者

青山 正治 横井 時秀 小林 俊郎

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.60, no.4, pp.240-245, 1988-04-25 (Released:2011-09-08)

参考文献数

11

被引用文献数

1

---

Spheroidal graphite cast irons containing four levels of Ni 0 to 3.5wt% and ones containing five levels of Mo 0 to 0.6wt% were prepared by the use of an induction furnace and cast. The iron into which Ni has been separately added has improved tensile strength and hardness because of solution hardening in the matrix. The impact transition temperature rises with condensation of Ni, while the upper shelf absorbed energy reduces. Separate addition of Mo has little effect on tensile strength and impact properties. Mechanical properties of spheroidal graphite cast iron can be improved by combined addition of Ni and Mo. The irons containing 1% Ni-0.1%Mo and 2.5%Ni-0.4%Mo show the lower impact transition temperature and have high toughness.

著者

辻川 正人 橋本 哲 川本 信

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.64, no.8, pp.526-530, 1992-08-25 (Released:2011-06-25)

参考文献数

7

被引用文献数

6

---

Thermit reaction was induced in molten aluminium silicon alloy by addition of coarse silica particles with stirring. Exothermic reaction commenced in the Al-Si eutectic melt at 1023 K. All silica particles were reduced into silicon in a brief period. Reduced silicon resolved into matrix melt. This thermit reaction produced α-alumina particles. These oxides were as large as added silica particles. After solidification, microstructures of specimens exhibited eutectic matrix, large primary silicon crystals and the oxide particles. A series of experiments were executed with magnesium addition before silica particles mixing. Magnesium quickened the dispersion of silica particles into matrix melt. So the thermit reaction occurred more rapidly and the highest temperature attained by the reaction was higher than those attained by the experiments without magnesium addition. The oxide particles resulted by experiments with magnesium showed a proof that the thermit reaction took place from outside to inside of silica particles gradually under high temperature.

著者

斎藤 武 星野 勝夫 白石 邦彦 若林 光洋 川村 和夫

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 全国講演大会講演概要集 第142回全国講演大会講演概要集 (ISSN:18805388)

巻号頁・発行日

pp.89, 2003 (Released:2018-03-10)

著者

阿部 利彦 藤野 知樹 森 仁 中村 保彦 内一 哲哉 高木 敏行

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.85, no.12, pp.895-899, 2013-12-25 (Released:2018-01-01)

参考文献数

11