巻号一覧
39 巻, 9 号
選択された号の論文の10件中1～10を表示しています
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成田 圀郎1970 年 39 巻 9 号 p. 902-905
発行日: 1970/09/25
公開日: 2011/08/05
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黒田 太郎, 綱島 巌, 山谷 弥太郎1970 年 39 巻 9 号 p. 905-917
発行日: 1970/09/25
公開日: 2011/08/05
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高木 健治1970 年 39 巻 9 号 p. 917-925
発行日: 1970/09/25
公開日: 2011/08/05
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後熱処理による改善西尾 安弘, 大前 尭, 三浦 譲1970 年 39 巻 9 号 p. 926-933
発行日: 1970/09/25
公開日: 2011/08/05
ジャーナル フリーDelayed cracking having long incubation period which occurs in 405 stainless steel weldment was described.
Bending test results of the weldment without delayed cracking are much scattered in elongation.
Bending test of weldment was carried out using different chemical composition materials and some post heat treatment, and mechanical properties of bond were studied with thermal recycled specimen.
Following are the reasons for bending results of weldment being scattered and for improvement of bending properties through this investigation.
1. The reason for poor bending result of 405 weldment-is coexistence of martensite and coarsed ferrite grain at welded bond.
2. More Al content of 405 stainless steel induces coarse ferrite grain at welded bond, which means that in the case of 0.05%, Q, Al less than 0.11% is desirable, and in the case of 0.18% Al, C about 0.08%, is desirable.
3. Martensite in welded bond is decomposed by low temperature heat treatment such as 250C×lhr, 350C×1hr.
This is the reason that bending results of weldment are improved by this heat treatment.抄録全体を表示PDF形式でダウンロード (8092K) -
小林 卓郎, 桑名 武, 青島 勇1970 年 39 巻 9 号 p. 934-940
発行日: 1970/09/25
公開日: 2011/08/05
ジャーナル フリーThe nitrogen contents of aluminum weld metal made in Ar-N2 mixed gas atmospheres were determind. The soundness, depth of penetration and mechanical properties of the weld metal were evaluated to investigate the possibility of argon-nitrogen-gas metal-arc welding of aluminum. The important conclusions are as follows:
1) Aluminum weld metal absorb a large quantity of nitrogen in the atmosphere containing nitrogen.
2) Nitrogen additions below about 80% do not appear to increase the porosity of aluminum weld metal at low current levels.
3) Nitrogen added to the shielding inert gas increases the depth of penetration.
4) Nitrogen additions up to about 80% increase slightly the tensile strength of aluminum weld metal without a substantial loss in ductility.
5) The argon-nitrogen-gas metal-arc welding process will be able to be used for limited applications.抄録全体を表示PDF形式でダウンロード (6644K) -
益本 功, 玉置 維昭, 飯沼 勝彦1970 年 39 巻 9 号 p. 941-950
発行日: 1970/09/25
公開日: 2011/08/05
ジャーナル フリーVarious laminated bars and plates were made combining some steels and face centered cubic metals and alloys by adhesive-bonding, casting and hot rolling. The fatigue tests were performed on the notched bar and notched plate test specimens of these laminated materials, and effects of each surface material and joining method were compared. The experimental results obtained were as follows:
(a) Adhesive-bonded laminated bars with core mild steel and surface materials of stainless steel, copper, 60/40 brass and aluminum showed larger fatigue strength than that of solid mild steel bar. With 1mm in surface thickness, the laminated bar of stainless steel had the largest fatigue strength and that of aluminum the smallest of all the tested laminated bars, but with 0.5mm in surface thickness, there was little difference between the fatigue strength of those kind of surface materials.
(b) The fatigue strength of adhesive-bonded copper-80kg/mm2 high strength steel bar was larger than that of the same high strength steel bar, only when the copper thickness was smaller than 0.5mm.
(c) Cast laminated bar of 60/40 brass and mild steel had a little larger fatigue strength comparing with adhesive-bonded one.
(d) Both cycles to failure and cycles to crack initiation of stainless clad steel increased with increment of stainless steel thickness. The stainless clad steel plate had larger fatigue strength than that of adhesive-bonded plate.
(e) Rolled laminated plate of 2.5% nickel steel and mild steel had a larger fatigue strength than that of mild steel plate and, in a certain stress range, it showed rather larger fatigue strength comparing with 2.5% nickel steel plate.抄録全体を表示PDF形式でダウンロード (1818K) -
立川 逸郎1970 年 39 巻 9 号 p. 951-957
発行日: 1970/09/25
公開日: 2011/08/05
ジャーナル フリーTo explore residual stress patterns resulting from explosive bonding, macro-residual biaxial stresses perpendicular to and along to explosion direction have been measured on explosive clad made from two similar mild steel plates. Testing techniques are based on cutting out blocks from the clad, etching off successive thin layers of each block, and, in these procedures for stress release, measuring biaxial strains in it, from which residual stresses can be calculated (Fig.1).
The results show that residual stresses relieved by cutting out are much smaller than those relieved by etching off (Fig.7 & 9). Also, two stresses perpendicular to each other are about the same independent of the explosion direction, but vary at different points in clad (Fig.9). Residual stresses have mostly tensile values of approximately 0 to 20 kg/mm2 throughout clad metal and bonded zone, and, at some points, amount to about the yield point of clad metal or conversely compressive values (Fig.11).抄録全体を表示PDF形式でダウンロード (1700K) -
中村 素, 内木 虎蔵, 岡林 久喜1970 年 39 巻 9 号 p. 958-963
発行日: 1970/09/25
公開日: 2011/08/05
ジャーナル フリーThe fracture initiation behavior of single-edge-notched tension test specimen was studied over a range of testing temperatures using bainitic steels, martensitic steels and quenched and tempered steels, to get a small size specimen which is suitable for the investigation of weldable steel with a high resistance to fracture initiation.
The results indicate that (1) the fracture toughness values (COD) to fracture initiation on small size specimen are little different from them on wide plate when the notch root radius of specimen are very small and the average stresses are well below the yield stregth, and (2) the relation between logarithmic fracture toughness values and temperature is linear at lower temperatures.抄録全体を表示PDF形式でダウンロード (4483K) -
益本 功, 江原 隆一郎, 上田 勝彦1970 年 39 巻 9 号 p. 964-970
発行日: 1970/09/25
公開日: 2011/08/05
ジャーナル フリーFatigue tests of 55 kg/mm2 high strength steel and weather resistant steel were carried out under various atmospheres in atmosphere-controlled chamber.
The results obtained are as follows;
1) The fatigue strength of high strength steel is decreased by oxygen and humidity in atmosphere. Nitrogen has little effect on it.
The critical oxygen content which affects fatigue life of high strength steel is about 1 % which is the same as that of mild steel
2) Fatigue crack initiation is little affected by oxygen and humidity in atmosphere. But gases accelerate the fatigue crack propagation
3) In comparison with mild steel, fatigue lives of high strength steels are considerably affected by air.抄録全体を表示PDF形式でダウンロード (4100K) -
1970 年 39 巻 9 号 p. 994-997
発行日: 1970/09/25
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (1855K)
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