巻号一覧
67 巻, 1 号
選択された号の論文の8件中1～8を表示しています
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論説
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中村 貞行, 秦野 敦臣1996 年 67 巻 1 号 p. 4-11
発行日: 2000/03/27
公開日: 2000/03/27
ジャーナル フリーThe influence of phosphorus and boron on the fatigue strength and the impact value of carburized steels were investigated. Phosphorus weakens the grain,~ boundary and so decreases the fatigue strength and the impact value with frequent grain boundary cracks. Boron addition improves the fatigue strength and the impact value of the steel tainted with P. Auger electron spectroscopy revealed that the B treatment substantially prevents P from segregating at grain boundaries. And the reduction of silicon and manganese contents increases the fatigue strength and the impact value of the B bearing steel.抄録全体を表示PDF形式でダウンロード (757K) -
松村 康志, 紅林 豊1996 年 67 巻 1 号 p. 12-18
発行日: 2000/03/27
公開日: 2000/03/27
ジャーナル フリーThe effect of induction-hardened depth on torsional fatigue strength of notched specimens were investigated. The results are as follows.
(1) Induction-hardened specimens shows the best torsional fatigue strength when the effective case depth / radius ratio is about 0.5.
(2) In the case ofshallow case depth, the cracks initiate at the hardened / unhardened bound-ary. On the other hand, the fracture ofdeeply hardened specimen originates from the surface抄録全体を表示PDF形式でダウンロード (746K) -
井上 幸一郎, 中村 貞行1996 年 67 巻 1 号 p. 19-25
発行日: 2000/03/27
公開日: 2000/03/27
ジャーナル フリーThe influence of alloy elements on tensile properties and large stress amplitude fatigue strength of various matrix structure steels was investigated by tensile test. tension-compression fatigue test and micro structure observation. The fatigue strength is strongly related to the 0.01% proof stress. Each microstructure has different relationship between the fatigue strength and 0.01% proof stress. When the 0.01% proof stress is constant. the bainite structure shows the highest fatigue strength followed by the ferrite - pearlite. and the tempered martensite is the lowest. The 0.01% proof stress of ferrite - pearlite structure steel is improved by increase in vanadium content. Therefore. the fatigue strength of ferrite - pearlite structure steels is increased by vanadium addition more effectively than by other elements.抄録全体を表示PDF形式でダウンロード (760K) -
紅林 豊1996 年 67 巻 1 号 p. 26-33
発行日: 2000/03/27
公開日: 2000/03/27
ジャーナル フリーInfluence of carbo-nitride precipitates on austenite grain coarsening behavior in carburizing was investigated. The grain coarsen;ing temperature is increased by the addition of Nb,Hf.Ti and Ta. Especially, the small amount of Nb shows a remarkable improvement of the grain coarsening temperature. The precipitates of AIN ' Nb(C,N). AIN and Nb(C.N) are observed in the Nb containing steels. The composite precipitates AIN ' Nb(C,N) are more stable than AIN and Nb(C,N) at elevated temperature and prevent the abnormal grain coarsening抄録全体を表示PDF形式でダウンロード (863K) -
紅林 豊, 秦野 敦臣1996 年 67 巻 1 号 p. 34-43
発行日: 2000/03/27
公開日: 2000/03/27
ジャーナル フリーInfluence of silicon and vanadium contents on fatigue properties of carburized steels have been investigated. The rolling con;tact fatigue strength and rotating bending fatigue strength increase with addition of silicon and vanadium. The L10 life of 1.5%Si-0.3%V steel is five times longer than that of SCr420 steel. The microstructural changes induced by rolling contact load have been observed below the raceway surface of the tested specimens by the optical microscopy. These microstructural changes are affected by silicon and vanadium contents and for that reason the rolling contact fatigue life increases with an increase of silicon and vanadium content.抄録全体を表示PDF形式でダウンロード (1069K)
解説
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川崎 一博1996 年 67 巻 1 号 p. 44-55
発行日: 2000/03/27
公開日: 2000/03/27
ジャーナル フリーPDF形式でダウンロード (1217K)
技術資料
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井上 幸一郎, 中村 貞行1996 年 67 巻 1 号 p. 56-61
発行日: 2000/03/27
公開日: 2000/03/27
ジャーナル フリーThe influence of carbon, manganese, chromium and vanadium on toughness of ferritepearlite microalloyed steel was investigated by instrumented Charpy impact test which was able to measure both crack initiation energy and crack propagation energy. Further. the effect of carbon and vanadium on fatigue limit was investigated by rotating bending fatigue test. As a result. high-strength and high toughness microalloyed steels that contained 1.1% manganese. 0.5% chromium and optimum balance of carbon and vanadium for each aimed strength and toughness were developed.抄録全体を表示PDF形式でダウンロード (541K) -
中坪 修一, 新貝 元, 津野 雅英, 永谷 哲洋, 松谷 博司1996 年 67 巻 1 号 p. 62-67
発行日: 2000/03/27
公開日: 2000/03/27
ジャーナル フリーVCR ( Vacuum Converter Refiner ) makes it possible to replace dilution process of AOD with vacuum process at the final stage of decarburization and the following slag reduction period. Ultra low carbon and nitrogen stainless steel can be produced comparatively easily in 70 ton VCR process with several operational improvements such as estimation of decarburization behavior under vacuum and preventing [N] pick-up during tapping and casting. Some operational results and discussion of decarburization and denitrification of 70 ton VCR in Chita Plant are described.抄録全体を表示PDF形式でダウンロード (380K)
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