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Showing 1 to 20 of 22 for “"Advanced High Strength Steels"”.
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Development of third generation advanced high strength steels
<p>"Lightweight duplex steels with combinations of either bainite, acicular ferrite, and austenite or martensite and austenite were investigated as third generation advanced high strength steels targeted for automotive applications. Large additions of manganese (>13 wt%) and carbon (</p> <p>Duplex …
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Shear failures in bending of advanced high strength steels
Includes bibliographical references (pages 245-251).
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Resetting microstructures and properties in TRIP-assisted advanced high strength steels
… steel. However, current resettable TRIP-maraging steels require long and unfeasible resetting treatments. The limit of resetting kinetics has not been reached and the microstructure resetting mechanism has not been fully understood. Here we focus on providing a deeper understanding of the …
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Development Of High Strength High Toughness Third Generation Advanced High Strength Steels.
<p>Third generation advanced high strength steels (AHSS's) are emerging as very important engineering materials for structural applications. These steels have high specific strength and thus will contribute significantly to weight reduction in automotive and other structural component. In this …
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Effect of microstructure on the fracture response of advanced high strength steels
… effects on formability included four 780 MPa strength, and four 980 MPa strength AHSS grades produced with varying processing conditions. The grades were an uncoated DP780, a high yield DP780, a galvanized DP780, a TRIP780, a galvannealed DP980, a galvanized DP980, an uncoated DP980, and a …
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ATOMISTIC SIMULATION AND FIRST PRINCIPLES CALCULATION OF INTERFACIAL ENERGETICS OF GALVANIZED ADVANCED HIGH STRENGTH STEELS
The 3rd generation (3G) advanced high strength steels (AHSSs) have drawn significant attention in recent years because applications of AHSSs will enable vehicle mass reduction with safety standards met, which can reduce the emissions of greenhouse gases of vehicles. However, the increased …
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Effects of deformation modes on the susceptibility of delayed fracture of advanced high strength steels
… on the susceptibility to delayed fracture in advanced high strength steels (AHSSs) were evaluated using four types of commercially-produced sheet steels (DP780, DP980, TRIP780 and TRIP980). Specimens were strained by either uniaxial tension or bending prior to hydrogen charging and their …
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Microstrain Partitioning, TRIP Kinetics and Damage Evolution in Third Generation Dual Phase and TRIP-Assisted Advanced High Strength Steels
… have been achieved by third generation (3G) Advanced High Strength Steels (AHSSs) by a means of increased strength. The challenge faced in doing so, however, is in ensuring that ductility and crashworthiness is efficiently retained. Key methods in which automotive research has been invested …
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PERITECTIC BEHAVIOR DETECTION AND PREDICTION IN Fe-C-Si-Mn-Al SYSTEM
… growth in the continuous casting of peritectic steels constitutes a major barrier to the commercial production of many steel grades such as Advanced high strength steels (AHSS), transformation induced plasticity (TRIP) steels, abrasion-resistant steels, advanced armor plate steels, and many …
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Jet impingement boiling heat transfer at low coiling temperatures
The production of advanced high strength steels (AHSS) for use in the automotive and construction industries requires complex control of runout table (ROT) cooling. Advanced high strength steels require coiling at temperatures below 500 °C in order to produce a complex multi-phase microstructure. …
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Reaktionsmechanismen von Legierungselementen beim rekristallisierenden Glühen zur Schmelztauchveredelung von Mehrphasenstählen
In the steel industry, the development of high-strength multi-phase steels is a priority objective given the competition from materials of lower density, i.e., aluminium, magnesium or plastics. Improvements in passive vehicle safety deriving from a more widespread use of surface-coated multi-phase …
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Ductile fracture after complex loading histories : experimental investigation and constitutive modeling
… issues related to the crack initiation in advanced high strength steels after loading direction reversal. The main outcome of the present work is a fracture initiation model for proportional and non-proportional loading. The starting point of this thesis is a first chapter on the …
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Development of LTTW consumables for the enhancement of mechanical properties and residual stress management in thin steel welded joints
… fatigue life of the lap-joint panels using advanced high strength steels (AHSS) is typically limited by the weldments. Low transformation temperature welding (LTTW) consumables are characterized by low martensite start temperature and large fraction of martensite forming in the weld. It can …
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Development of a punching technique for ductile fracture testing over a wide range of stress states and strain rates
Advanced High Strength Steels (AHSS) are becoming increasingly popular in automotive design because of possible weight savings due to the high strength. However, traditional methods are not capable of predicting fracture in AHSS, leading to expensive redesign due to poor prediction of stamping and …
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Effect of Processing Path on Microstructure and Mechanical Properties of a Low Carbon, Low Alloy Advanced High Strength Steel
… to this requirement, several variants of advanced high strength steels (AHSS) have been developed with the latest focus on 3rd generation AHSS. In this work, microstructural evolution and mechanical properties of an automotive grade low carbon, low alloy steel under air-cooled, …
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Modeling of sheet metal fracture for shell finite elements with component level validation
… design of car bodies. The increasing usage of advanced high strength steels and other lightweight materials to meet ever-stringent standards on passenger safety and gas emissions makes related advances in experimental and computational mechanics a pressing issue. The industry has been using …
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Edge fracture of AHSS sheets under out-of-plane loading followed by in-plane loading
… application of light-weight materials such as Advanced High Strength Steels (AHSS) and aluminum alloys. A premature edge cracking is observed in components with blanked/trimmed/pierced edges during the subsequent metal forming process. To understand the underlying physical mechanism and to …
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Edge Fracture Prediction Of Dual Phase Steels With Consideration Of Microstructures
<p>In recent years, Advanced High Strength Steels (AHSS) have been used for the lightweight structural design and manufacturing in automotive industry. This class of sheet metals are prone to edge fracture during stamping production, and the fracture often occurs at much lower strain than that …
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Hydrogen embrittlement resistance in advanced high strength: vanadium bearing and TRIP-assisted steels
Advanced high strength steels undergo a series of microstructural transitions associated with damage, these lead to failure especially when hydrogen enters the lattice and gets trapped in defects. It is desired to design advanced steels highly resistant to hydrogen embrittlement (HE), while …
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Development of new coating alloys
… industry, the transition towards lightweight steels aims to reduce exhaust emissions while ensuring crashworthiness. To provide sacrificial corrosion protection, Zn-based coatings are applied to these carbon steels via hot-dip galvanizing (HDG). However, the high temperatures involved in HDG …
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