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Showing 1 to 14 of 14 for “"martensite transformation"”.
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Crystallography and Electron Metallography of the Martensite Transformation in Iron - Aluminum - Carbon Alloys
Made available in DSpace on 2015-05-12T22:36:06Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7121259.PDF: 8667123 bytes, checksum: 9462159e0c7f97d526096a07899e4548 (MD5) Previous issue date: 1971
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Wear Mechanism/microstructure Relationships for Laser Processed Cast Iron (Erosion, Abrasion, Martensite, Transformation)
… microstructures, as well as the austenite to martensite transformation in the dendritic microstructure sample. Of special interest is this austenite to martensite transformation. In a liquid nitrogen thermal treated (-196(DEGREES)C) sample, only bct high carbon martensite is present. In a …
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Understanding the Stability of Retained Austenite in High-Carbon Steels: Modelling and Alloy Design
In high-carbon steels, the austenite-to-martensite transformation under applied stress initiates at a critical value, contrary to low-carbon steels where the transformation occurs at the early stages of deformation. There are few models that account for the delayed transformation, because previous …
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The fatigue crack growth behavior of superelastic nickel titanium
… the scientific community: The stress induced martensite phase causes deviations of stress intensity and state at the tip from the classical handbook solutions widely relied on for crack growth characterization. In this work, novel methods of stress intensity factor extraction based on in situ …
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The Thermal Stabilisation of Austenite at Sub-Zero Temperatures
… the phenomenon. The complex interactions between martensite transformation and stress have also been discussed in order to assess the feasibility of a stabilisation mechanism controlled by stress-relaxation.<br/>The kinetics of stabilisation have been studied using an electrical resistance …
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Understanding toughness and ductility in novel steels with mixed microstructures
… are found to be present, namely: cementite and martensite. This is explained as resulting from relatively low alloying additions and chem- ical segregation effects, which are modelled using thermodynamic and kinetic approaches. Chapters 5 and 6 contain a comprehensive study of the response of …
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The abrasive wear resistance of austempered spheroidal graphite irons
… brought about by the stress induced austenite to martensite transformation during abrasion. The influence of microstructure and mechanically induced transformation has been studied as a function of austempering temperature and time.
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An Investigation of the Structural and Magnetic Transitions in Ni-Fe-Ga Ferromagnetic Shape Memory Alloys
The martensite and magnetic transformations in Ni-Fe-Ga ferromagnetic shape memory alloys are very sensitive to both alloy chemistry and thermal history. A series of Ni-Fe-Ga alloys near the prototype Heusler composition (X2YZ) were fabricated and homogenized at 1423 °K, and a Ni₅₃Fe₁₉Ga₂₈ alloy …
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Experimental investigation and constitutive modeling of the large deformation behavior of anisotropic steel sheets undergoing strain-induced phase transformation
The strain-induced phase transformation from austenite to martensite is responsible for the high strength and ductility of TRansformation-Induced Plasticity (TRIP)- assisted steels. The large deformation behavior of conventional steels is governed by crystallographic slip. In the case of TRIP …
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Hydrogen-Induced Transformations in Metastable High Entropy Alloys
… that exhibit a mechanically-induced austenite-to-martensite phase transformation—pose an interesting opportunity for HE resistance, where the toughening mechanisms associated with this transformation could counter HE effects under the right conditions. One alloy system, FeMnCoCr, has been …
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Instrumented Nanoindentation Studies Of Deformation In Shape Memory Alloys
… as mechanical twinning and stress induced phase transformation between a high symmetry phase (austenite) and a low symmetry phase (martensite) additionally occur and influence mechanical behavior and thus their functionality. Consequently, applications of SMAs usually call for precise phase …
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Modelling of Microstructure Development in Silicon-containing Bainitic Free-machining Steels
… 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 microstructure has …
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The cold rolling and primary recrystallisation textures of austenitic stainless steels.
… - quantitative phase analysis of austenite and martensite, determination of diffraction line profiles, hardness measurements, optical and electron metallography, qualitative identification of carbide phases. The high purity alloys (18%Cr 10%Ni, 18%Cr 12%Ni, 18%Cr 14%Ni, 18%Cr 12%Ni 7%Co and …
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Paměťové materiály
V současné době je věnována velká pozornost materiálům s paměťovým efektem a především intermetalické sloučenině NiTi. Tato slitina je velmi stabilní a korozně odolná. Její výroba je však velmi obtížná z důvodu velké reaktivity titanu. Paměťový jev v tomto materiálu je závislý na mnoha faktorech, …