AFM Study of Microstructure Role in the Cyclic Plasticity of Martensitic Steel

Gulzar Seidametova; Jean Bernard Vogt; Ingrid Proriol Serre

doi:10.4028/www.scientific.net/SSP.258.444

Paper Titles

Influence of the Loading Path on the Deformation Mechanisms of Magnesium Alloys
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Residual Stress Effects and Predicting Crack Growth in Weldments
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On the Preparation of Advanced Materials via Pulsed Electric Current Sintering Procedures
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Microstructure Similarities between Phases F and U in Al-Pd-Co Alloys
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AFM Study of Microstructure Role in the Cyclic Plasticity of Martensitic Steel
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Measurement of the Porosity of Additive-Manufactured Al-Cu Alloy Using X-Ray Computed Tomography
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Effective Elastic Properties of 3D Composites with Short Curvilinear Fibers: Numerical Simulation and Experimental Validation
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Magneto-Mechanical Behavior of Iron during Monotonic and Cyclic Loading
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Field Measurement of Natural Electromagnetic Emissions near the Active Tectonic and Mass-Movement Fractures in Caves
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AFM Study of Microstructure Role in the Cyclic Plasticity of Martensitic Steel

Abstract:

The paper presents the description of FSMs (fatigue slip markings) and the evaluation of cyclic plasticity markings of a 12%Cr martensitic steel by AFM surface analyses. The microstructure of a 12%Cr martensitic steel, quenched and tempered in air, consists of prior austenite grains, packets, blocks, and laths. The low cycle fatigue (LCF) test at a total strain range Δε_t=1.2% was interrupted at different life fractions for the surface relief investigation by AFM. The localization of FSMs relatively to the different microstructural interfaces of the studied steel was proposed. The principal FSMs, appeared in the first fatigue cycle, are likely to be localized at the packet and block boundaries, while the secondary one (appeared later at 44% of lifetime) are at the lath boundaries or in the laths. The height of principal and secondary FSMs increases constantly during LCF cycling.