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Showing 1 to 14 of 14 for “"Tempered martensite"”.
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Study of tempered martensite embrittlement in 4130 type steels, A
Includes bibliographical references (pages 97-102).
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Tempered martensite embrittlement in 4340 steel as related to phosphorus content and carbide morphology
Includes bibliographical references (pages 120-124).
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Impact fracture of embrittled stainless steels
… played by slip planarity, transformation to martensite, and other strain rate sensitive factors, strict ordering of various steels' susceptibilities to hydrogen cannot be expected by this method. Nevertheless, the method may provide a reasonable alternative to thorough characterization of the …
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Development Of High Strength High Toughness Third Generation Advanced High Strength Steels.
… austenite microstructure in the samples austempered above Ms temperature, whereas tempered martensite and austenite microstructure was obtained in samples austempered below Ms temperature. Yield strength, tensile strength and fracture toughness were found to increase as the austempering …
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Theory and significance of retained austenite in steels
… 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 both involve …
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The role of microstructure in the temper embrittlement of low alloy steels.
… were investigated in the pearlitic, bainitic and tempered martensitic conditions to establish the role of microstructure.Heat-treated alloys were characterised by fracture studies including Izod impact testing and subsequent electron microscopy.Simultaneous Auger electron spectroscopy and energy …
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Effect of Processing Path on Microstructure and Mechanical Properties of a Low Carbon, Low Alloy Advanced High Strength Steel
… steel under air-cooled, water-quenched, and tempered conditions have been studied. The microstructural characterization has been carried out using an optical microscope, scanning electron microscope, energy-dispersive spectroscope, and electron backscattered diffraction tools. Mechanical …
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Design and modelling of ultra-high strength steels: nanoprecipitation and plasticity
… occurring in the mechanical properties during martensite tempering is essential in the development of new industrial grades. The aim of this research was to develop new ultra-high strength steels via nanoprecipitation control, which requires an understanding of the …
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The effect of microstructure on the fracture toughness of a high strength steel
… as-quenched microstructure was predominantly autotempered lath martensite. A little retained austenite was observed in all as-quenched martensite. Austenitizing at 1200°C instead of the conventional 850°C resulted in a 30 percent increase in as-quenched fracture toughness with no loss in tensile …
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Wear of fine pearlite, nanostructured bainite and martensite
… steels are based on a quenched and tempered martensitic microstructure, because the hardness of the steel should intuitively matter in determining the wear rate. Nevertheless, the relationship between the rate of material loss and steel hardness is unlikely to be monotonic. The …
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Influence of the heat treatment procedure on the stress corrosion cracking behaviour of low pressure turbine blade material FV566
… of the FV566 steel blades is referred to as tempered martensite. van Rooyen showed that for 12% chromium steel tempering at and above 600°C induces passivity of the material against SCC, while tempering of 12% chromium steels at 450-550°C causes sensitisation of the material and the material …
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Mitigating high-temperature, high-pressure hydrogen attack
… the carbon activity. This is not the case in tempered martensite that contains many lattice defects, where excess carbon may be retained, hence increasing carbon availability for methane formation. Vanadium carbides are found to be more stable than chromium or molybdenum carbides in the alloy …
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The development of titanium nitride strengthened creep resistant ferritic steels
… steels and gain their creep strength from the tempered martensite structure and the precipitated carbides and nitrides. Their long term creep performance is ultimately limited by the rate at which these precipitates coarsen or otherwise transform over time at elevated temperature. This research …
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Transformation and precipitation in vanadium treated steels
… characteristics of austenite, the tempering of martensite and other structures, the transformation during continuous cooling, the effect of vanadium addition and increasing nitrogen content on the thermo-mechanical processing of austenite, and the transformation of various morphologies of …