巻号一覧
65 巻, 4 号
選択された号の論文の6件中1～6を表示しています
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木村 利光, 中村 貞行1994 年 65 巻 4 号 p. 295-303
発行日: 1994/10/15
公開日: 2009/05/25
ジャーナル フリーSuper carburizing is characterized by its high surface carbon content up to 2-4% and carbide dispersion in the case. This process is a promising heat treatment to strengthen case hardened parts, such as gears and bearings. However, it can be predicted that the carbide morphology will change with a difference in the heat cycle, mass and shape of the workpiece.
Therefore, the influence of carbide morphology in the case on fatigue properties was investigated. Plasma carburizing was used to disperse carbides in case of new grade steel (0.18% C-0.5% Si-0.3% Mn-2.25% Cr-0.4% Mo). The size and area fraction of the carbides was varied 0.6-1.8μm and 9-40%, respectively. It is confirmed that the carbide morphology has little influence on both the 107 cycle bending fatigue limit and the fatigue strength in the low cycle region.抄録全体を表示PDF形式でダウンロード (9637K) -
野田 俊治, 岡部 道生, 磯部 晋1994 年 65 巻 4 号 p. 304-309
発行日: 1994/10/15
公開日: 2009/05/25
ジャーナル フリーPlasma carburization, one of techniques, has been widely utilized to improve wear resistance of structural steels.
In this study, the effect of plasma carburization on properties of TiAl was investigated. Specimens cut from cast ingot with composition of Ti-33.5Al-1Nb-0.5Cr-0.5Si (mass%) were carburized for 3.6ks at 1173K in C3H8/Ar mixture gas atmosphere with pressure of 107Pa by a plasma carburization furnace. Ti2AlC carbide layer about 3μm in thickness was formed on the TiAl by the carburizing. This layer showed higher hardness than bearing steel AISI 52100 with Vickers hardness of 836HV1. The carbide layer did not show harmful effect on room temperature tensile and rotating bending fatigue properties of TiAl. As a result of pin-on-disk wear test, the wear resistance of the carburized TiAl was extremely improved as compared with bare TiAl. It is concluded that plasma carburization is a promising technique for TiAl.抄録全体を表示PDF形式でダウンロード (7263K) -
松村 一郎, 川手 賢治, 石本 崇, 今泉 正1994 年 65 巻 4 号 p. 310-318
発行日: 1994/10/15
公開日: 2009/05/25
ジャーナル フリーOil crisis occurred in 1973 awakened the Japanese industries to become much more conscious than ever about energy conservation.
Lately in 1992 more than 140 countries over the world gathered in Rio de Janeiro to agree with the environment protection treaty on the global basis and in November of the same year the guard against green house effect of the earth by prohibiting the usage of fron gas, trichroloethan and those hazardous materials was confirmed in the international conference held in Montreal.
Thus, energy conservation as a “must” for reducing production cost has now been developed to the common philosophy of environment protection of the earth.
Keeping pace with such tendency of the world industry of heat treatment an emphasis is put on the technology development for energy conservation on the basis of lean production by the most rationalized equipments. In the paper we would examine the current technologies in the following terms.
(1) Energy saving
(2) Copper tube coil annealing furnace with degreasing system
(3) Saving of processing time, area and processing itself
(4) High accuracy atmosphere gas control system抄録全体を表示PDF形式でダウンロード (5125K) -
広瀬 秀志, 池井 文夫, 水口 敬一1994 年 65 巻 4 号 p. 319-328
発行日: 1994/10/15
公開日: 2009/05/25
ジャーナル フリーA new cooling control system to improve scale removability from wire rod after a heat treatment such as spheroidizing annealing has been developed.
This system remarkably reduces a pickling treatment necessary for scale removal and enables an efficient mechanical descaling by shot blasting.
This improved scale removal treatment consists of two (2) parts, the scale composition adjustment process in which wire rod is maintained in atmospheric air for a specified time after the furnace process, and the prevention process of adjusted scale composition transformation which is performed by fast cooling.
By this treatment,
(1) Wire rod with mill scale can be treated without pre-pickling with the same treatment efficiency level as pre-pickled material.
(2) Pre-pickled material and drawn wire are treated by 1/2∼1/3 pickling time compared to conventional slow cooling of wire rod.
When scale on wire rod is removed using a shot blast, this treatment enables scale removal with 1/2∼1/3 of shot density, resulting in a reduction of required power and shot consumption.
Combination of this efficient shot blasting with the foundation treatment for wire drawing using water-soluble lubricant, it enables high efficient non-pickling and non-zinc phosphate treated wire drawing which is free from hydrogen embrittlement and delayed fracture by phosphorus.抄録全体を表示PDF形式でダウンロード (7576K) -
小野 政幸, 花谷 隆亘, 野口 實, 水口 敬一1994 年 65 巻 4 号 p. 329-334
発行日: 1994/10/15
公開日: 2009/05/25
ジャーナル フリーQuick heating-up technology for coiled wire rods has been developed, which utilizes convectional heating up with combustion from inside through coiled wire rods. The state-of-the-art Q.F. (Quick heat type batch Furnace) that is applied with the quick heat-up technology has been installed in 1991, and shows quite effective results as follows;
(1) Product capacity increase of 20%
(2) Stable quality, such as hardness and decaburization level of surface.
(3) Threefold increase of labor productivity and improvment of operation environment due to the fully automated line.抄録全体を表示PDF形式でダウンロード (263K) -
伊藤 武1994 年 65 巻 4 号 p. 335-341
発行日: 1994/10/15
公開日: 2009/05/25
ジャーナル フリーMany surface treatments are available that permit superficial hardening or special wear-resistant surface and other properties for certain applications.
This paper includes recent technology of surface treatments: Liquid Nitriding (PW Process: Prevents Wearing, PS Process: Prevents Wearing & Scuffing), Chemical Vapour Deposit (3-layer CVD), Plasma Powder Welding etc. for tool steels.抄録全体を表示PDF形式でダウンロード (2729K)
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