The quantitative characterization of the microstructure evolution in high-Mn steel during deformation is of great importance to understanding its strain-hardening behavior. In the current study, in situ high-energy synchrotron X-ray diffraction was employed to characterize the microstructure evolution in a Fe-17Mn-1.5Al-0.3C steel during a tensile test. The microstructure at different engineeri...

In situ neutron diffraction experiment was used during tensile testing at room temperature to examine the changes on the percentage and texture of both ferrite and austenite in a nanocrystalline bainitic steels transformed at two different temperatures 200°C and 300oC for different times to achieve the same phase percentages. Both samples showed an inadequate capability of austenite to transfor...

The study focuses on the superelastic effect in single-crystalline boron-doped Fe-based shape memory alloys. homogenized and quenched single crystals were subjected to a heat treatment at 973 K for variable aging times. As result, small coherent nanometer-sized γ′ (Ni 3 Al-type) precipitates formed. It was established that Fe-28Ni-17Co-11.5Al-2.5Ta-0.05B oriented along [001] direction exhibit f...

A 3D elastoplastic phase-field model is used to study the effect of isochronal heating on martensitic transformation in stainless steel quenched cryogenic temperature. The results show that slower heating, larger martensite volume fraction developed heating. simulated microstructures driven by autocatalysis during early stages and coarsening existing units later transformation. internal stresse...

A new type of high chromium cast iron (HCCI) was prepared, and its microstructure, mechanical properties, abrasion resistance were investigated systematically. Results showed that after surface carburizing chromizing, the microstructure HCCI mainly consists martensite, boride (M2B), carbide (M7C3), accompanied with a large amount secondary precipitations M23C6. Moreover, morphology hardness in ...

in this paper, turbulent mixed convective heat transfer of water and al2o3 nanofluid has been numerically studied in a horizontal tube under non-uniform heat flux on the upper wall and insulation in the lower wall using mixture model. for the discretization of governing equations, the second-order upstream difference scheme and finite volume method were used. the coupling of pressure and veloci...

Deformation behavior and microstructure evolution of NiTiCu shape memory alloy (SMA), which possesses martensite phase at room temperature, were investigated based on a uniaxial compression test at the temperatures of 700~1000 ◦C and at the strain rates of 0.0005~0.5 s−1. The constitutive equation of NiTiCu SMA was established in order to describe the flow characteristic of NiTiCu SMA, which is...

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...