Results 101 to 110 of about 80,576 (254)

Recycling‐Induced Copper Contamination of a 42CrMo4 Quench and Tempering Steel—Scaling and Susceptibility to Hot Shortness

steel research international, EarlyView.
In this study, the susceptibility to copper‐induced hot shortness of the alloy 42CrMo4 is investigated by different hot tensile tests, as well as by a detailed analysis of the formed oxidation products. While an enrichment of metallic copper and a penetration of the grain boundaries are observed, no critical reduction of the tensile test properties can
Alexander Gramlich, Sindokht Shayan, Nima Babaei, Aleksei Klubakov, Lena Patterer, Ulrich Krupp, Hauke Springer   +6 more
wiley   +1 more source

Modeling the iron oxides and oxyhydroxides for the prediction of environmentally sensitive phase transformations

, 2011
Iron oxides and oxyhydroxides are challenging to model computationally as competing phases may differ in formation energies by only several kJ/mol, they undergo magnetization transitions with temperature, their structures may contain partially occupied ...
A. F. Gualtieri, Amanda S. Barnard, C. Kittel, D. C. Golden, Haibo Guo, J. F. Nye, J. Majzlan, K. M. Rosso, R. M. Cornell, T. M. Henderson, T. Nagai   +10 more
core   +1 more source

Influence of Hydrogen Fuel Mixtures on the Oxide Scale Formation of Low‐Carbon Steels in Reheating Furnace Conditions

steel research international, EarlyView.
This work illustrates how substituting natural gas with hydrogen as fuel in the reheating furnace will influence the oxide scale formation on the steel surface. Thermogravimetric analysis and characterization techniques are used to investigate oxidation behavior and the formation of oxide phases.
Francis Gyakwaa, Susanna Airaksinen, Ville‐Valtteri Visuri, Anne Heikkilä, Timo Fabritius   +4 more
wiley   +1 more source

Using Thermodynamics and Microstructure to Mitigate Overfitting in Pellet Reduction Models

steel research international, EarlyView.
A in time and space discretized, thermodynamically sound model for direct reduction of iron oxide pellets is described. The number of fitting parameters is drastically reduced compared to existing models. Nevertheless, fitting kinetic parameters based on conversion degree data alone leads to overfitting, which can be mitigated by correlating the ...
Ömer K. Büyükuslu, Fabrice Yang, Dierk Raabe, Moritz to Baben, Anna L. Ravensburg   +4 more
wiley   +1 more source

Effect of aluminum substitution on the reflectance spectra of hematite [PDF]

Hematite and aluminous hematite were synthesized and the diffuse reflectance spectra were recorded for the region between 0.35 and 1.20 microns. Results show that the near-IR based minimum for the aluminous hematite is shifted longward by about 0.02 ...
Lauer, H. V., Jr., Mendell, W. W., Morris, R. V.   +2 more
core   +1 more source

Caddo Ceramics from an Early 18th Century Spanish Mission in East Texas: Mission San Jose de los Nasonis (41RK200) [PDF]

, 2009
Mission San Jose de los Nasonis (4JRK200) and two contemporaneous Nasoni Caddo sites (41RK191 and 41RK197) were located by Mr. Bill Young more than 25 years ago in the southern part of Rusk County, Texas after the general area of the site had been ...
Marceaux, P. Shawn, Perttula, Timothy K., Young, Bill   +2 more
core   +1 more source

Reduction, Softening, and Melting Characteristics of Mill Scale‐Based Briquettes for Blast Furnace Ironmaking

steel research international, EarlyView.
The study evaluates mill scale‐based briquettes, which meet industrial standards for shatter strength and exhibit a low decrepitation index. Despite their limited reducibility in nonisothermal reduction experiments, softening and melting results indicate potential application as a substitute for conventional acidic iron‐bearing materials for use in ...
Ismael Vemdrame Flores, Paula Maria Gomes Cunha Leão, João Victor Souza Alves, Otávio Henrique Matos de Assis, Maurício Covcevich Bagatini   +4 more
wiley   +1 more source

Possible way of effective enrichment of the mixed ores [PDF]

, 2013
Викладено результати експериментальних досліджень, що дозволили розробити та рекомендувати до впровадження нові технічні рішення комплексної переробки змішаних (напівокислених) залізних руд з використанням екологічно безпечної технології магнітної ...
Bulah, A.V., Bulah, O.A., Shvets, M.V., Булах, А.В., Булах, О.А., Швец, М.В.   +5 more
core  

Chiral properties of hematite ({\alpha}-Fe2O3) inferred from resonant Bragg diffraction using circularly polarized x-rays

, 2013
Chiral properties of the two phases - collinear motif (below Morin transition temperature, TM=250 K) and canted motif (above TM) - of magnetically ordered hematite ({\alpha}-Fe2O3) have been identified in single crystal resonant x-ray Bragg diffraction ...
Blanco, J. A., Lovesey, S. W., Rodriguez-Fernandez, A., Scagnoli, V., Shukla, D. K., Staub, U., Strempfer, J., Walker5, H. C.   +7 more
core   +1 more source

Recycling of Mill Scale Into High‐Purity Iron Through Hydrogen‐Based Reduction

steel research international, EarlyView.
Mill scale, an iron oxide–rich steel by‐product, is difficult to recycle due to impurities. This study evaluates hydrogen‐based direct reduction and hydrogen plasma smelting reduction as low‐carbon recycling routes. Impurity segregation limits reduction kinetics. Direct reduction achieves 92% conversion in 180 min, while plasma reduction reaches 91% in
Nathalia C. Verissimo, Anumoy Ganguly, Lucas Varoto, Tim M. Schwarz, Jean‐Baptiste Letz, Ubaid Manzoor, Laurine Choisez, Dierk Raabe, Isnaldi R. Souza Filho   +8 more
wiley   +1 more source