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Mironov S.,Tohoku University | Sato Y.S.,Tohoku University | Kokawa H.,Tohoku University | Inoue H.,Welding and Joining Research Center | Tsuge S.,Nippon Steel & Sumitomo Metal Corporation
Acta Materialia | Year: 2011

Electron backscattering diffraction was employed to study grain structure development and texture evolution during friction stir welding (FSW) of a low stacking fault energy material, S31254 superaustenitic stainless steel. Formation of the final stir zone (SZ) microstructure was deduced to be primarily governed by discontinuous recrystallization occurring during the FSW cooling cycle. The textural pattern formed in the SZ was interpreted in the terms of {1 1 1}〈u v w〉 and {h k l}〈1 1 0〉 partial simple shear fiber textures. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Source


Nose T.,Welding and Joining Research Center | Okawa T.,Nippon Steel & Sumitomo Metal Corporation
Nippon Steel Technical Report | Year: 2012

Many steel structures are fabricated by welding steel materials together. When a fracture occurs in a welded steel structure, the origin is often a weld zone. The reason for this is that the weld zone is structurally susceptible to stress concentration and that there is the possibility of various defects. Nippon Steel Corporation has long engaged in the development of technology to improve the reliability of weld zones in steel structures. Among others, the company has been striving to establish and offer a total solution for fatigue fractures hoping to deliver high performance steel products which are safe and secure. Nippon Steel Corporation has long engaged in the development of technology to improve the reliability of weld zones in steel structures. Among others, the company has been striving to establish and offer a total solution for fatigue fractures hoping to deliver high performance steel products which are safe and secure. Source


Takahashi M.,Steel Research Laboratorie | Suehiro M.,A-D Technologies | Ochi T.,Muroran R and D Laboratory | Miyazaki Y.,Welding and Joining Research Center
Nippon Steel Technical Report | Year: 2012

Steel production in Japan grew in tandem with the growth in domestic automobile production. Understandably, therefore, past development and expansion of the Japanese steel industry cannot be discussed without reference to the automotive industry of Japan. While the collision characteristics of a complete car body are ultimately evaluated through crash tests using real automobiles, to clarify the effects of individual improvement measures, it is necessary to examine the deformation behavior of the structure of the whole body prescribed parts and of the individual parts. While the crash energy absorbing property of frontal or rear collision by plastic deformation increases with increasing strength of the steel used, press formability improves with decreasing strength, and for this reason, steel sheets that are soft at the time of press forming and harden at the time of use, or those having strength highly dependent on strain rate, are desirable. However, the strain-rate dependence of steel strength decreases as the strength increases. Source


Kubo Y.,Surface Treatment Research Laboratory | Hanya K.,Steel Structure R and nter | Kodama S.,Welding and Joining Research Center
Nippon Steel Technical Report | Year: 2012

The contribution to energy savings through reduced iron loss of non-oriented electrical steel sheet for motors and the development of stainless steels with good corrosion resistance and aesthetic appeal may be cited as cases in point. When steel sheet with lubricating film is used for the cartridge tank of an oil-powered fan heater, for example, since the film itself plays the same role as paint with good corrosion resistance, the prescribed corrosion resistance can be secured even if the painting process after press forming is omitted. As a base resin, a polyurethanebased resin has been adopted in view of the relationship between tensile strength and longation. The underlying concept is that the resin used for film is designed and developed based on an understanding of the properties of various base metals, plating types and resins, and that the lubricant and other functional materials are designed so as to develop various types of films with not only high lubricating performance, but also good corrosion resistance, formability, and electrical conductivity. This concept has also been applied to the development of various films for surface-treated steel sheets. Source


Uemori R.,Tube and Shape Research Laboratory | Hasegawa Y.,Tube and Shape Research Laboratory | Hara T.,Kimitsu R and D Laboratory | Inoue T.,Tube and Shape Research Laboratory | And 3 more authors.
Nippon Steel Technical Report | Year: 2012

Oil, coal and natural gas, which are fossil fuels, account for the great majority of energy resources. Therefore, it is extremely important to produce and transport them at reasonable cost. In particular, high-performance steels are indispensable for the production and transportation of crude oil and natural gas. They include the development of new steels with superior high-temperature strength, new corrosion-resistant steels for boilers that use heavy oil or biomass as their fuel, and the study of thicker heavy-section steels with greater strength and toughness which allow for an increase in the hydroelectric power generating capacity of dams. In industries such as thermal, nuclear and hydroelectric power generation, positive efforts have also been made to enhance the performance of steels. They include the development of new steels with superior high-temperature strength, new corrosion-resistant steels for boilers that use heavy oil or biomass as their fuel, and the study of thicker heavy-section steels with greater strength and toughness which allow for an increase in the hydroelectric power generating capacity of dams. Source

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