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Authors: Clodualdo Aranas Jr., John J. Jonas
Torsion simulations of strip rolling were carried out on a 0.06%C-0.3%Mn-0.01%Si steel over the temperature range 930°C to 1000°C. Pass strains of 0.4 were applied at a strain rate of 1s'1. Interpass times of 0.5s, 1s, 1.5s and 3s were employed to determine the mean flow stresses (MFSs) applicable to strip rolling.
Authors: Robert Cryderman, Danielle Rickert, Michael Burnett, John G. Speer, and David K. Matlock
Connecting rods for the latest design of internal combustion engines require progressively higher fatigue strength and an economical means for manufacture. Modem steel connecting rods are being produced as a single forging followed by fracture splitting to separate the cap from the rod. Steel composition and forging process variables have been shown to affect the fracture splitting characteristics as well as machinability and final part strength. Alloying and processing factors have continued to evolve as driven by the need for performance improvement and cost reduction.
Authors: Roger Sims, Tanya Ros-Yanez, William Heitmann
In a desire to improve performance of tank cars, especially in derailment situations, the Tank Car Steel Task Force of the AAR Tank Car Committee investigated the performance, formability and weldability of ASTM A709 Grade 50 (HPS 50W) as an improved steel to use in the construction of new tank cars.
Authors: Alan P. Druschitz, Katie Tontodonato
Heat treatment (solutionize and quench) altered the characteristic operating parameters and reduced the variation in performance of an aluminum-zinc-bismuth alloy sacrificial anode as measured by galvanostatic, potentiostatic, open circuit, Tafel and galvanic corrosion tests. The specific alloy composition was Al-0.57 wt% Zn-0.55 wt% Bi and the heat treatment was solutionize at 5380C (1000°F) for 96 hours followed by water quenching. The average potential and corrosion rate from galvanostatic tests were -0.815 } 0.011 V sce and 0.35 } 0.02 mg/hr for as-cast material and -0.798 } 0.010 V sce and 0.36 } 0.02 mg/hr for heat treated material.
Authors: B.S. Butz, G.R. Holcomb, G.H. Meier
Two deposit compositions were examined in short-term laboratory tests with the aim of determining rate controlling corrosion mechanisms of fireside corrosion for a range of chromia-forming alloys in oxy-combustion systems.
Authors: Sylvester Stafford, Judy Schneider
At present there is no established procedure for selection of FSWing process parameters. The current trial and error methods, which are material and thickness specific, are costly to develop and do not readily translate to other alloys or thicknesses.
Influence Of Mn-Co Spinel Coating On Oxidation Behavior Of Ferritic Ss Alloys For Sofc Interconnect Applications
Authors: V. Venkatachalam, S. Molin, W. R. Kiebach, M. Chen, P.V. Hendriksen
Chromia forming ferritic stainless steels (SS) are being considered for intermediate temperature solid oxide fuel cell interconnect applications. However, protective coatings are in general needed to avoid chromium volatilization and poisoning of cathodes from chromium species. Mn-Co spinel is one of the promising candidates to prevent chromium outward diffusion, improve oxidation resistance and ensure high electrical conductivity over the lifetime of interconnects.
Authors: Jingkun Yu, Chengwan Cui, Xinzhong Tian, Liangcai Zhong, Xinli Wang, Wenbin Dai
In order to improve the thermal shock resistance of yttria by forming coarse grain with closed pores, a proper additive was firstly selected among calcium nitrate, cerium nitrate, and neodymium nitrate. Then, the effect of calcia on the grain growth of yttria was investigated.
In Situ Observation Of Acicular Ferrite Formation Using Ht-Lscm: Possibilities, Challenges And Influencing Factors
Authors: D. Loder, S.K. Michelic, A. Mayerhofer, C. Bernhard and R.J. Dippenaar
By using a Laser Scanning Confocal Microscope combined with a High Temperature Furnace (HT-LSCM) for the in situ investigation of acicular ferrite (AF) formation in HSLA steels, new information about the mechanism of formation of this high toughness phase can be gained. Due to the utilization of an inert furnace atmosphere, the ability to accurately adjustment the austenitizing temperature and the well-controllable cooling conditions, the interactions between steel composition, austenite grain size, cooling rate and the fraction of AF formed have been analyzed in detail.
An Insight To The Aar Steels Task Force Projects And Initiatives To Improve Materials For Tank Car Construction
Authors: Carl S. Hybinette
There have been a number of modifications to steel specifications over the last several years by the Steels Task Force of Subcommittee 1 of the Association of American Railroads (AAR) Tank Car Committee. If the steel is covered by an ASTM specification, such as A516 Gr. 70, the change is not to the ASTM specification, but rather as a special AAR requirement over and above that of the ASTM specification, while still maintaining compliance with that specification.