Railway Track & Structures - June 2008 - (Page 20)

TTCI R&D important aspects of advanced steel design and development. To date, TTCI and the University of Pittsburgh have proposed five premium rail steel candidates in this design and development program. Four of these compositions are pearlitic and one is bainitic, with carbon content from 0.7 wt%C to 0.85 wt%C for the pearlitic steels and 0.3 wt%C for the bainitic steel. Other alloying elements added to the proposed compositions include vanadium, molybdenum, niobium, manganese, silicon and low phosphorus and sulfur content. Current and future work TTCI is focusing on the optimization of the chemical composition followed by thermomechanical processing and microstructure. This new steel design should have superior fatigue resistance through improvements in ductility, fracture, and impact toughness. A heat of this steel is planned to be cast and forged by late 2008 and scheduled to be installed in track at Figure 3 shows the experimental procedure for the next generation of rail steel (Dy = average austenite grain size, OM = optical microscopy, SEM & TEM = scanning and transmission electron microscopy, respectively, EBSD = electron backscattering diffraction, IQ = index of quality). FAST in 2009 during the next rail performance test. This rail will be tested along with rail from other manufacturers to be able to directly compare its performance with the performance of commercial rails. If this experimental rail demonstrates comparable and ideally superior wear resistance to commercial premium rails and higher fatigue performance; the chemical composition, together with a new premium rail specification, will be proposed to AREMA as the new standard composition for the Next Generation Premium Rail. Lucin Rail Cutoff under construction, courtesy of Salt Lake City Chamber of Commerce. Salt Lake City - September 21-23 REMSA World Rail Expo 2008 Held in conjunction with AREMA Annual Conference The largest Maintenance-of-Way exhibition in North America! Join the world’ finest display of equipment, s tools, materials and technology. Meet the industry’s high-profile decision-makers from around the globe. Reserve your exhibit space now! Visit www.remsa.org or email contact@remsa.org REMSA, 417 West Broad Street, Suite 203, Falls Church, VA 22046 email: contact @remsa.org • fax: (703) 241-8589 20 Railway Track & Structures June 2008 www.rtands.com http://www.aar.com http://www.rtands.com

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Railway Track & Structures - June 2008 Contents On Track Industry Today Supplier News AREMA News NRC News TTCI R&D Grade Crossings Provide Interface Between Railroads, Public Grade-Crossing Equipment & Materials Guide Fastener Suppliers Getting a Grip Grinding Plays Part in Rail Maintenance Big Picture Products and Literature People Calendar Sales Representatives Website Directory Advertisers Index Professional Directory Classified Advertising Chicago Perspective

Railway Track & Structures - June 2008

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