The combined effect of the cooling rate and microalloying has been studied from suction casted Cu50Zr50, Cu49.5Zr50Fe0.5 Cu49Zr50Fe1 at. % rods 2 mm 4 diameter. For samples, ∼1000 K/s rate, microstructure mostly consists B2 CuZr austenite it is basically same for all compositions. However, 0.5 Fe addition promotes formation stress-induced B19’ martensite upon wear testing thus improving resista...

This study aims to systematically investigate the influence of boron (0–3.0 wt % B) on microstructure and abrasive wear characteristics high chromium based multi-component white cast iron (Hi-Cr MWCI). As result, is mainly composed martensite matrix carborides such as M7(C, B)3, M2(C, B), M23(C, B)6. At low load, B can increase resistance Hi-Cr MWCI owing higher volume fraction B). However, it ...

Transformation-induced plasticity (TRIP) is a phenomenon that improves the deformability of high-strength steel. TRIP depends on deformation-induced martensite transformation behavior. To clarify mechanism in low-alloy steel, we evaluated behavior via in-plane tension and compression experiments. During tensile compressive deformation, volume fraction austenite (Vγ) decreased as strain stress i...

The austenite-to-martensite transformation in a partially hardened stainless steel containing 17wt %Cr, 7wt %Ni and 1wt % Al was investigated with Vibrating Sample Magnetometry and Electron Back-Scatter Diffraction. Magnetometry demonstrated that measurable martensite formation can be suppressed on fast cooling to 77K as well as on subsequent fast heating to 373 K. Surprisingly, martensite form...

in this study, effects of multi walled carbon nanotubes and temperature on rheological behavior of engine oil (10w40) have been examined. for this purpose, the experiments were carried out in the temperature range of 5-55°c for several suspensions with solid volume fractions of 0.025%, 0.05%, 0.1%, 0.25%, 0.5% and 0.75%. the viscosity of all samples was measured in the shear rate range of 666s-...

the performance of a γ-al 2 o 3 /n-decane nanofluid shell-and-tube heat exchanger in a biomass heating plant is analyzed to specify the optimum condition based on the maximum heat transfer rate and performance index for wide range of nanoparticle volume fraction (0–7%). compared with pure          n-decane, the obtained results in this research show that by using γ-al 2 o 3 /n-decane nanofluid ...

the aim of the present paper is to study the cu-water nanofluid flow and heat transfer characteristics of a stretching permeable cylinder. thermal radiation effect is considered in energy equation. the governing partial differential equations with the corresponding boundary conditions are reduced to a set of ordinary differential equations with the appropriate boundary conditions using similari...

The aim of this study was to evaluate tensile properties low and medium carbon ferrite -martensite dual phase steel, the effect cryogenic treatment at liquid nitrogen temperature (-196 ºC) on its properties. Low steel (C12D) steels (C32D & C42D) were used in work. For each grade, five groups specimens prepared according type heat treatment. first group normalized, second normalized subseque...

To overcome the trade-off relationship between tensile strength and elongation of dual-phase steels, three exploratory techniques were utilized: Bayesian optimization (BO), BoundLess Objective-free eXploration (BLOX), one-class support vector machine (OCSVM). The BO is an method using Gaussian process regression, BLOX OCSVM are designed for finding out-of-trend materials. Initially, a large num...