Orowan strengthening effect on the nanoindentation hardness of the ferrite matrix in microalloyed steels

“…The Orowan mechanism is wellknown as the main precipitation streng-thening mechanism. [11][12] Generally, the strength increase by Orowan mechanism is expressed as…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Mechanical Property in the Weld Heat-affected Zone of V-added Austenitic Fe-Mn-Al-C Low Density Steels

Moon¹,

Park²

2015

Journal of Welding and Joining

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Microstructure and tensile property in the weld heat-affected zone (HAZ) of austenitic Fe-Mn-Al-C low density steels were investigated through transmission electron microscopy analysis and tensile tests. The HAZ samples were prepared using Gleeble simulation with high heat input welding condition of 300 kJ/cm, and the HAZ peak temperature of 1200℃ was determined from differential scanning calorimetry (DSC) test. The strain-stress responses of base steels showed that the addition of V improved the tensile and yield strength by grain refinement and precipitation strengthening. Tensile strength and elongation decreased in the weld HAZ as compared to the base steel, due to grain growth, while V-added steel had a higher HAZ strength as compared than V-free steel.

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“…In this regard, Hall-Petch equation was derived to express the relationship between grain size and hardness as follows by combining with Tabor's empirical relationship H ≈ 3σ. (Petch and Iron Steel 1953;Moon et al 2008)…”

Section: Hardnessmentioning

confidence: 99%

“…ΔH Orowan , ΔH CTE , and ΔH L represent the contribution from the Orowan strengthening, thermal mismatch mechanism and load-bearing effect, respectively. The contribution of the dislocation and the impenetrable GNSs to hardness can be explained using Orowan strengthening mechanism as follows (Moon et al 2008):…”

Section: Hardnessmentioning

confidence: 99%

Microstructure and mechanical properties of aluminium-graphene composite powders produced by mechanical milling

Zhang

Chen

Zhao

et al. 2018

Mech Adv Mater Mod Process

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Background: Graphene has been reported to be a promising nanofiller in fabricating advanced metal matrix composites. Methods: Graphene nanosheets (GNSs) have been incorporated into an aluminium matrix composite using mechanical milling and hot pressing in the current study. Results: The SEM observation shows that aluminium particles are firstly flattened into flakes, and then fractured/ rewelded into equiaxed particles as the ball milling progresses. The crystalline size is decreased and the lattice strain is increased during the ball milling, which are also intensified by the added GNSs. The hardness of the composite is increased by 115.1% with the incorporation of 1.0 vol. % GNSs. Conclusions: The local stress induced by the hard GNSs accelerates the milling process. The X-Ray diffraction patterns show that the intensity ratio of (111) to (200) can reflect the preferred orientation of the particle mixture, and the evolution of I(111)/I(200) agrees well with the observed results using SEM. The increased hardness is mainly attributed to the refined microstructure and Orowan strengthening.

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Orowan strengthening effect on the nanoindentation hardness of the ferrite matrix in microalloyed steels

Cited by 117 publications

References 12 publications

Grain and nanoparticle coarsening of an ultrafine structured Cu–5vol.%Al2O3 nanocomposite during isochronal annealing

Grain and nanoparticle coarsening of an ultrafine structured Cu–5vol.%Al2O3 nanocomposite during isochronal annealing

Microstructure and Mechanical Property in the Weld Heat-affected Zone of V-added Austenitic Fe-Mn-Al-C Low Density Steels

Microstructure and mechanical properties of aluminium-graphene composite powders produced by mechanical milling

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