Microstructural morphology is known to have a significant impact on the mechanical properties of dual-phase steels. A fine ferrite grain size and random distribution small second phase islands are desirable provide superior isotropic compared banded that typical for this type steel. rapid alloy prototyping (RAP) facility has been used investigate three different DP 800 variants by systematicall...

With the rapid development of low-carbon high strength steel, higher requirements are put forward for matching welding consumables. The deposited metals with 0.62–2.32% Cu addition was prepared by tungsten inert gas via metal cored wire. effect element on microstructure and mechanical properties were investigated. multiphase consists bainite, martensite, residual austenite, martensite-austenite...

The influence of microstructure on tensile properties and stretch-flangeability TRIP steels with strengths higher than 1.2 GPa has been investigated under various Quenching Partitioning (Q&P) conditions. As lowering the quenching stop temperature, QT, below Ms temperature in range 340°C to 280°C, volume fractions tempered martensite retained austenite increased bainite fresh decreased final mic...

In a dual phase steel, an increase in the martensite volume fraction leads to decrease its carbon content, and hence, elucidating effect of content on mechanical tribological behaviors has not been possible. For first time, present work dealt with this subject by maintaining constant amount different fractions martensite. Tribological properties was evaluated via pin-on-disk sliding tribometer....

in the present study, natural convective heat transfer in a partitioned square cavity utilizing nanofluids is studied. the vertical left and right walls are considered as the hot and cold walls, respectively and the partitions assumed to be adiabatic. the nanofluid used in this study is al2o3 with the volume fraction of 20%. it is assumed that nanofluid is a single phase fluid. fluent 6.3.26 is...

For suffi ciently small dimensions, the response of shape memory alloy (SMA) actuators is not independent of the sample size. The response of SMA single crystal micro/nanopillars is shown to depend on the size of the specimen. An increase in the critical stresses for the start and fi nish of austenite to martensite transformation is seen when reducing the diameter into the submicron region. In ...

The buoyancy-driven boundary-layer flow from a heated horizontal circular cylinder immersed in a water-based alumina (Al2O3) nanofluid is investigated using variable properties for nanofluid viscosity. Two different viscosity models are utilized to evaluate heat transfer enhancement from a cylinder. Exact analytic solutions of the problem are attained employing a novel...

A phenomenological macroscopic plasticity model is developed for steels that exhibit strain-induced austenite-to-martensite transformation. The model makes use of a stress-state dependent transformation kinetics law that accounts for both the effects of the stress triaxiality and the Lode angle on the rate of transformation. The macroscopic strain hardening is due to nonlinear kinematic hardeni...

Neutron diffraction spectra were obtained during various stages of a reversible stress-induced austenite to martensite phase transformation in superelastic NiTi. This was accomplished by neutron diffraction measurements on bulk polycrystalline NiTi samples simultaneously subjected to mechanical loading. Analysis of the data was carried out using individual lattice plane ~hkl! reflections as wel...