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Recent Developments In Continuous Annealing Process Of Advanced High Strength Steels At Thyssenkrupp Steel Europe
Authors: Marc Blumenau, Annette Baumer
Modem and future advanced high strength steels (AHSS) with multi-phase microstructure are characterized by an increasing amount of alloying elements, an increasing strength and an increasing demand for an appropriate continuous annealing process after cold-milling. Therefore, processing of AHSS in a continuous annealing line (CAL) represents a promising alternative to continuous hot-dip galvanizing.
Different Routes For The Development Of Ferritepearlite Microstructures Suitable For Spheroidization During Soft Annealing Treatments
Authors: J. Arruabarrena, P. Uranga, B. Lopez and J.M. Rodriguez-Ibabe
Cementite spheroidization during conventional soft annealing treatment, usually applied to medium carbon steels prior to cold forming, has been studied. Initial ferrite-pearlite microstructural features and conditioning of such microstructures by deformation assisted techniques allow a wide range of spheroidized microstructures and mechanical properties after annealing.
Effect Of Water Temperature On The Cooling Rate, Mechanical Properties Of A C-Mn Containing Steel Sheet
Authors: Xiaodong Zhu, Wei Li, Peng Xue
Nowadays, water quenching is widely used in continuous annealing lines to produce martensitic steel sheet or dual phase steel sheet. Water quenching is characterized by very fast cooling rate at around room temperature. In this paper, the effect of water temperature on the cooling rate, microstructure and mechanical properties of a cold-rolled C-Mn containing steel is studied.
Authors: Kevin Banks and Rorisang Maubane
The evolution of austenite during and immediately after roughing has been investigated with the aim of achieving a fine, uniform grain size in thick high temperature processing (HTP) steel skelp. Four-pass rolling simulations were performed after which austenite softening and the extent of grain refinement were determined from flow curve analysis and metallography respectively.
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.
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.
The Microstructure And Properties Of Ultra-High Strength Wear Resistance Steel Plate By A Novel Energy Conservation Process
Authors: Biao Ju, Huibin Wu, Di Tang, Pengcheng Zhang
A study of ultra-high strength wear resistance steel plate subjected to thermomechanical control process (TMCP) is presented. The dependence of the mechanical properties on the after rolled microstructure evolution was examined. With designed water cooling - relaxation - static air cooling process after hot rolling, the TMCP steel plate exhibited excellent combination of ultra-high strength and toughness, which is better than steel plate heat treated by conventional reheated quenching and tempering.
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: Pavel Suchmann, Petr Martinek
Chemical composition of steels used for heavy-duty parts of car gearboxes is usually defined by technical standards, in which certain deviations from nominal composition are allowed. However practical experience shows that in many cases even such small deviations can significantly influence the steel's behaviour during hardening.
Authors: Dr. Nikolai I. Kobasko
In the paper superstrengthening phenomenon is discussed which is based on self- regulated thermal process taking place during transient nucleate boiling mode. Superstrengthening means additional strengthening of a material when cooling rate within the martensite range is high enough and compressive stresses are formed at the surface of steel parts. The main attention is paid to self - regulated thermal process because it allows metallurgists to optimize superstrengthening phenomenon by maximizing density of dislocations in material and making optimal condition for precipitation of fine carbides in steels and irons.