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Showing 1 to 20 of 43 for “"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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Residual stresses in weldments in high-strength steels.
Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Ocean Engineering.
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Shear failures in bending of advanced high strength steels
Includes bibliographical references (pages 245-251).
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Design and modelling of ultra-high strength steels: nanoprecipitation and plasticity
… aim of this research was to develop new ultra-high strength steels via nanoprecipitation control, which requires an understanding of the processing-microstructure-property relationship in medium carbon (0.5-0.6 wt.%) steels throughout tempering. Much of the work has been centred in …
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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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Numerical models for simulating hydrogen diffusion and embrittlement in high strength steels
Esta tesis presenta y discute la modelización de la difusión de hidrógeno en metales como un primer paso para predecir y mitigar la fractura asistida por hidrógeno. La fragilización por hidrógeno es un fenómeno mediante el cual se degradan los metales y las aleaciones, siendo habituales los fallos …
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An accelerated K[subscript ISCC] test for high-strength steels in hydrogen
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1980
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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
… 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 delayed …
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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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Fundamentals and Applications of Hot Stamping Technology for Producing Crash-Relevant Automotive Parts
… metals such as aluminum or magnesium, or high strength steels are used. Typically in high strength steels and aluminum alloys, high springback and low formability are observed. One method to form ultra high strength steels is “Hot Stamping”. In this method, Manganese Boron alloyed steels …
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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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Ductile fracture after complex loading histories : experimental investigation and constitutive modeling
… 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 development of a …
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The Competing Roles of Microstructure and Flaw Size on the Fatigue Limit of Metals
… non-propagating crack size and crack barrier strength. The concept of three defect types associated with three different flaw dominated fatigue regimes is introduced. Furthermore, application of the model to fatigue mechanisms in high strength steels, synergistic effects of surface finish and …
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Applicability of undermatched welds for high strentgh steel structures
… experimental and numerical results for the strength of welded joints, made on high strength steels with different degrees of strength matching. The steels involved are the HY-100 and HY-130 U.S. Navy, quenched and tempered steels. The test methods are the self restraint cracking test, the …
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Deformation behaviour of additively manufactured microlattice structures : a micro-structural investigation
… in PBF process and the exhibition of unusually high strength-ductility property were possible to explain through the melt pool thermodynamics, that puts laser PBF produced 316L stainless steel to be high performing than most common engineering materials and comparable to high strength steels.
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