Topic
Hardening (metallurgy)
About: Hardening (metallurgy) is a research topic. Over the lifetime, 25584 publications have been published within this topic receiving 376012 citations.
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15 Jan 2012-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the influence of the process parameters of laser shock peening was investigated on specimens made of an aeronautic titanium alloy: Ti-5Al-2Sn-2Zr-4Cr-4Mo (Ti-17).
Abstract: The influence of the process parameters of laser shock peening was investigated on specimens made of an aeronautic titanium alloy: Ti–5Al–2Sn–2Zr–4Cr–4Mo (Ti-17). In order to quantify the effect of relevant process parameters, an experimental design was carried out. It is based on a full factorial design with four factors (laser fluence, pulse duration, number of impacts and thickness of the sample) and two levels for each factor. The process is characterised with the following variables: the depth of the impacts, the roughness of the treated surface, the hardening of the material (itself evaluated with the hardness and X-ray diffraction peak width), the residual stresses left in the sample and the global curvature of the sample. It is found that all the parameters have an influence on the residual stresses and that laser shock peening has no influence on roughness and low influence on work-hardening. The variables are then analysed in order to evaluate correlations. The increase in hardness is found to be essentially due to compressive residual stresses, cold work-hardening having only a small effect. In thin specimens, the stress redistribution due to self-equilibrium leads to tensile residual stresses at the treated surface and to large deformations of the specimens.
88 citations
TL;DR: In this paper, the authors investigated the role of porosity and inelastic and hardening deformation behavior of calcium-leached cement pastes and mortars in compression and showed that the low C/S C-S-H matrix is highly plastically deformable.
88 citations
TL;DR: In this article, an optimized intercritical hardening at 750°C led to a ferrite-austenite microstructure that was characterized by ∼64% austenite and excellent combination of tensile strength of ∼1000 MPa and elongation of ∼65%, and a three-stage work hardening behavior.
88 citations
TL;DR: In this article, various possible sources for the high strength at low temperature of the common refractory b.c. metals are examined for the two most likely possibilities, lattice hardening and impurity hardening, the former can unambiguously be shown not to be controlling in certain cases, while an impurity hardness model describes in considerable detail the experimental results in a wide variety of materials.
88 citations
15 Nov 2011-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the mechanical properties of AZ31 magnesium alloys with different grain sizes, basal texture intensities and twinning conditions were investigated at room temperature, and it was found that the rolled sheets show good ductility when grain size is around 15μm.
Abstract: Rolled sheets with various microstructures and (0 0 0 2) pole intensities have been obtained successfully using conventional flat rolling (CFR), differential speed rolling (DSR) and heat treatment methods. The mechanical properties of AZ31 magnesium alloys with different grain sizes, basal texture intensities and twinning conditions were investigated at room temperature. It was found that the rolled sheets show good ductility when grain size is around 15 μm. Finer grains and random (0 0 0 2) basal intensity are hardly achieved simultaneously using both DSR-RS and CFR-AR processing methods in current study. In the determination of the rolling processing, it is important to consider preferred grain refinement or lowered basal texture intensity. Moreover, the influences of grain size, basal texture intensity and twinning conditions on work-hardening rate were examined as well. As grain size decreases, extrapolated work-hardening rate decreases; while basal texture intensity has little effect on it. On the other hand, twinning plays a vital role in decreasing work-hardening in plastic flow stage; while twin boundaries increase the work-hardening rate in easy glide stage and linear hardening stage. However, they drop faster than un-twinned samples in stage III when the true strain is higher than 0.06.
88 citations