Materials Technology Division


Materials Technology Division

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Sone Y.,Materials Technology Division
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2017

Various innovations have been made possible thanks to progress in material technology, such as realization of higher performance and/or enhanced functions. Many material technologies have also contributed the railway system, improving the performance or functions of various types of rolling stock, equipment and facilities, and to more environmentally acceptable performance of various components of the railway system. Analytical and measurement methods are regarded as important technologies to understand deterioration of materials which is necessary for developing ways to improve their performance and function. This review describes some of the results from recent research and development conducted at RTRI in the field of material technologies, mainly contributing better functionality, and also presents analytical and measurement methods that assist progress in material technologies.

Kikawa S.,Lubricating Materials Laboratory | Suzumura J.,Lubricating Materials Laboratory | Sone Y.,Materials Technology Division | Nakamura K.,Lubricating Materials Laboratory | And 2 more authors.
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2014

A long-life gear oil for electric railway trains was developed to reduce the workload and cost of gear unit maintenance. A semi-synthetic base oil, a mixture of polyalphaolefin (PAO) and highly purified mineral oil, was used in the developed gear oil in order to improve high temperature oxidation stability. The composition of additives was also modified to enhance oxidation stability. In an accelerated oxidation test (Indiana stirring oxidation test at 135°C /96 hours), the developed gear oil demonstrated sufficient oxidation stability to enable an electric train to run 1,200,000 km without an oil change. Reliability at low temperatures was also shown to be better compared with existing gear oils, because the viscosity at low temperatures and the pour-point was reduced by virtue of the semi-synthetic base oil.

Sone Y.,Materials Technology Division
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2016

Innovation in railway technology can be achieved through progress in material technology, in terms of the development of the materials themselves, manufacturing processes, higher reliability, etc. Developing material technology is therefore essential for railways. To this end, analytical and mensuration methods are regarded as other basic technology. Today it is also necessary to meet environmental demands, by replacing harmful materials with environmentally acceptable substances, and ensuring that they are energy efficient. This paper describes some of the latest results from research and development into material technology, including the development and application of new materials, and analytical and mensuration methods.

Kanematsu Y.,Materials Technology Division | Satoh Y.,Materials Technology Division
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2011

Rail grinding is a traditional part of maintenance employed to mitigate rail damage such as shelling and corrugation. In order to improve the efficiency of grinding operations in the field, new grinding stones were developed and evaluated in this study. The improvement in grinding capacity of the developed grinding stone compared with the current grinding stone was confirmed, as was its improved grinding performance due to its more moderate impact on rails from a metallographic point of view despite the improved grinding performance. Based on these results, it is expected that the developed grinding stone has the potential to be introduced to field grinding operations.

Padhy G.K.,Materials Technology Division | Ramasubbu V.,Materials Technology Division | Albert S.K.,Materials Technology Division | Murugesan N.,Indira Gandhi Center for Atomic Research | Ramesh C.,Indira Gandhi Center for Atomic Research
Welding in the World | Year: 2012

Diffusible hydrogen measurement in welding consumables using a Nafi on ®117-based Proton Exchange Membrane Hydrogen Sensor (PEMHS) has been carried out successfully at room temperature. The same sensor has now been used for measuring diffusible hydrogen by the hot extraction method. With this objective, a chamber for hot extraction of diffusible hydrogen was designed and fabricated which could be heated to a maximum temperature of 500 °C, while the chamber itself is maintained at ambient temperature by water cooling. The chamber has an inlet and an outlet for argon purging and pressurization. For this measurement, weld specimens were prepared based on ISO 3690, the standard method for diffusible hydrogen measurement, by depositing cellulose, rutile and basic coated welding electrodes (having diffusible hydrogen content ranging between 3 and 31 ml/100 g of deposited metal) on standard mild steel specimen by manual metal arc welding. After preparing the weld specimen, it was transferred to the hot extraction chamber. The chamber was subsequently fl ushed and fi lled with argon to a known pressure level and then heated at 400 °C for 30 min for the collection of hydrogen. The concentration of hydrogen in the chamber was measured using the sensor. From the volume of the chamber, the pressure of the gas inside and the mass of the weld metal, the diffusible hydrogen content in the deposits was estimated. Measurements were also repeated using the standard Mercury Method. One-to-one correlation between these two different methods of measurement was obtained. The statistical accuracy of the results obtained with the new Hot Extraction-PEMHS Method was re-confi rmed by the t-Test. Further, the hydrogen content obtained with this new method was also compared with the hydrogen content obtained by Thermal Conductivity Detector (TCD)-based Hot Extraction Method (HMAT 2500 Analyzer). This paper presents the development of the system for hot extraction of diffusible hydrogen and its subsequent measurement using the sensor, the results obtained and the possible application of the systems for studying hydrogen evolution from the weld samples.

Aihara N.,Materials Technology Division | Tsujimura T.,Materials Technology Division
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2010

As means of the reduction of the environmental load, the change of the materials of the product is thought about. In order to grasp the load quantitatively, life cycle assessment is performed. In this report, the matter that we should pay attention to about environmental load of the materials of the railway is explained. In addition, as examples of evaluation of CO2 reduction effect, geo-polymer concrete production and the maintenance reduction effect resulting from the use of carbon contact strips on pantograph head are shown.

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