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Showing 1 to 20 of 38 for “"Bainite"”.
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The Crystallography and Morphology of The Bainite Transformation
Made available in DSpace on 2014-12-10T17:57:48Z (GMT). No. of bitstreams: 1 6706741.pdf: 7615009 bytes, checksum: 45742e48bcd0c2c8ba31b626ef3f540b (MD5) Previous issue date: 1966
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Wear of fine pearlite, nanostructured bainite and martensite
… the structure from pearlite, nanostructured bainite to martensite by heat treatment, do not lead to significant differences in the wear rate. This is because the wear mechanisms change, for example from severe sub-surface deformation leading to sticking in the case of pearlite, to brittle …
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Aging Effects in Copper-Zinc-Aluminium Shape Memory Alloys (Martensite, Bainite)
Aging in both the beta phase and martensitic state of Cu-Zn-Al alloys causes deterioration and instability of shape memory properties, even at moderate temperatures. These aging effects have been studied by electrical resistivity measurements and bend tests. The corresponding changes in …
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Some of the effects of bainite on the impact properties of steel
Thesis (M.S.)--Michigan State University. Dept. of Metallurgy, Mechanics, and Materials Science, 1964
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Modelling of Microstructure Development in Silicon-containing Bainitic Free-machining Steels
… ferrite, pearlite, Widmanstatten ferrite, bainite and martensite. The effect of recalescence has been included to give a better estimation of the cooling curve under natural cooling conditions. A model for estimating retained austenite size distribution in the carbide-free bainitic …
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Effect of Microstructure on Mechanical Properties of High Strength Steel Weld Metals
… of the low carbon weld metals a mixture of upper bainite, lower bainite and a novel constituent—coalesced bainite—formed. Coalesced bainite was characterised by large bainitic ferrite grains with cementite precipitates and is believed to form when the bainite and martensite start temperatures are …
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Low Temperature Cleavage Fracture of Microalloyed Bainitic Plate Steels
… grain (PAG) size, volume fractions of two bainite types (conventional bainite and acicular ferrite) and EBSD 15° domain size. Charpy impact tests (using two notch orientations) were carried out over a range of temperatures. Cleavage facet sizes were measured on -196°C Charpy samples. The …
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The thermal stability of bulk nanocrystalline steels
Nanocrystalline bainite, commonly known as “superbainite”, is a novel class of steel that utilises careful alloy design to reduce the bainite transformation temperature to below 300℃. This results in grains that are tens of nanometres in width, which make steel strong and tough. The structure can …
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Bainitic steel with 30 GPa% characteristics
… for optimum mechanical properties. Therefore bainite should be generated from a strain–free recrystallised austenite grain structure. The Habit plane, orientation relationship and associated shape strain were characterized simultaneously for the first time on individual bainite plates. The …
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Coupled Diffusional/Displacive Transformations
… to estimate the corresponding changes in the bainite-start temperatures of the same steels. Thus, the accuracy claimed by the original theory appears fortuitous for bainite. The failure is attributed to the fact that the model does not include any variation in the stored energy as a function …
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Theory and significance of retained austenite in steels
… of small quantities of austenite following the bainite and martensite phase transformations have been examined, together with the influence of retained austenite on the properties of low alloy steels. It was found that the upper and lower bainite transformations are separate reactions, although …
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Development of third generation advanced high strength steels
… 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 steels …
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An investigation into the mechanisms of cone bore growth in railroad bearings
… transformation of retained austenite to bainite, and (3) low temperature creep have been conducted. Both carburized and uncarburized 4320 steels were tested. The retained austenite contents (A$\sb{\rm ret}$) of the two carburized steels were 35% and 14%.
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Characterisation and Development of Nanostructured, Ultrahigh Strength, and Ductile Bainitic Steels
… concepts regarding the design and performance of bainite steels is presented in Chapters 1 and 2. Chapter 2 focuses on the design concepts by which the steel chemical composition was optimised, primarily on the basis of cost and the avoidance of carbide precipitation. Chapter 3 deals with the …
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Understanding toughness and ductility in novel steels with mixed microstructures
… in a class of nanostructured carbide-free bainite-austenite steels, sometimes known as ‘superbainite’. The mechanical properties of these alloys have been extensively reported, but their interpretation is not clear. The thesis begins with an introduction to both the relevant nanostructures …
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Creep crack initiation and growth in 2.25% chromium - 1% molybdenum alloy steel
… order of constraint observed being that of 100% bainite > mixed ferrite / bainite > mixed ferrite / pearlite.</p> <p>A correlation between the carbide type, distribution and shape and the creep deformation and crack initiation process has been discussed and the implications of this to remanent …
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Carbo-nitride precipitation and its effect on matrix transformations in high strength-high toughness 300M steel
… resulting in an increased percentage of upper bainite, that led to a lower temper response compared to 925 austenitisation temperature. The improved K1C value was attributed to increased dissolution of fine particles due to higher austenitisation temperatures
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