Journal ArticleDOI
Micro-tension behaviour of lath martensite structures of carbon steel
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In this paper, a micro-tension testing technique was used to investigate the deformation behavior of lath martensite structures with several types of boundaries in carbon steel, and it was shown that the block boundaries are an effective grain boundary for impeding dislocation gliding.Abstract:
A micro-tension testing technique was used to investigate the deformation behaviour of lath martensite structures with several types of boundaries in carbon steel. The martensite structures exhibited sufficient necking strains and ductile fractures, whereas the uniform strain was limited owing to a lack of strain-hardening ability despite the increased flow stress. The yield stress of the lath martensite structures strongly depended on the in-lath-plane orientation. The critical resolved shear stress of the in-lath-plane slip systems was considerably lower than that of the out-of-lath-plane slip systems. This finding suggests that the block boundaries are an effective grain boundary for impeding dislocation gliding. Plastic deformation transfer was restricted by the packet boundaries, which greatly rotated the crystallographic orientation of the in-lath-plane slip systems between neighbouring martensite variants.read more
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Nanolaminate Transformation-Induced Plasticity-Twinning-Induced Plasticity steel with Dynamic Strain Partitioning and Enhanced damage Resistance
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3D structural and atomic-scale analysis of lath martensite: Effect of the transformation sequence
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Multiple mechanisms of lath martensite plasticity
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Journal ArticleDOI
Failure of metals III: Fracture and fatigue of nanostructured metallic materials
TL;DR: In this article, the current state of the art in terms of plastic localization, damage, static and fatigue cracking for three classes of systems: (1) bulk ultra-fine grained and nanocrystalline metals, (2) thin metallic films on substrates, and (3) 1D and 2D freestanding micro and nanoscale systems.
Journal ArticleDOI
Effect of Prior Austenite Grain Size Refinement by Thermal Cycling on the Microstructural Features of As-Quenched Lath Martensite
TL;DR: In this paper, the effect of PAGS refinement by thermal cycling on different microstructural features of as-quenched lath martensite in a 0.3C-1.6Si-3.5Mn (wt pct) steel was analyzed.
References
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Journal ArticleDOI
The morphology and crystallography of lath martensite in Fe-C alloys
TL;DR: In this article, the morphology and crystallography of lath martensite in Fe-C alloys containing various carbon contents from 0.0026 to 0.61% were studied by analyzing electron back scattered diffraction patterns in scanning electron microscopy and Kikuchi diffraction pattern in transmission electron microscope.
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Crystallographic features of lath martensite in low-carbon steel
TL;DR: In this article, electron backscattering diffraction with field-emission scanning electron microscopy was used to analyze crystallographically the lath martensite structure in a 0.20% carbon steel.
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A further step towards an understanding of size-dependent crystal plasticity: In situ tension experiments of miniaturized single-crystal copper samples
TL;DR: In this article, the size effects of the plastic deformation behavior of copper single crystals loaded along the 〈−2.3.4'' direction were investigated and a method for in situ testing of miniaturized tension specimen was developed.
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Fracture elongation of brittle/ductile multilayered steel composites with a strong interface
TL;DR: In this paper, the ductile tensile deformation behavior of multilayered steel composites consisting of brittle martensitic steel and ductile steel layers, which were prepared by hot rolling to achieve a strong interface, was investigated.
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Evaluation of the block boundary and sub-block boundary strengths of ferrous lath martensite using a micro-bending test
TL;DR: In this paper, the block boundary and sub-block boundary strength of lath martensite was evaluated through a micro-bending test and it was shown that the presence of a block boundary in the specimen greatly increased the strength.