A new experimental approach is used to quantify the full field heterogeneous strain accommodation associated with martensitic phase transformation in Nickel–Titanium at the microstructural length scale. Local deformation measures were matched with underlying microstructural characteristics obtained by EBSD, providing point-by-point correlation between transformation extent and microstructure. I...

The author have developed a new SCC test method that enables the super Kelvin force microscope (SKFM) and the Kelvin force microscope (KFM) observations. By using this test device, the crack tip deformation and surface potential distribution were observed on SUS310S stainless steel by SKFM and KFM. At the same time, the distribution of hydrogen was examined by the Ag decoration method with the ...

The stress corrosion cracking (SCC) of stainless steel is one of the biggest problems for maintaining atomic power and chemical plants. However the mechanism has not been solved because of difficulty in observing hydrogen movement. In order to solve this problem, the author has developed a new SCC test method that enables the super Kelvin force microscope (SKFM) and the Kelvin force microscope ...

Thermal strain, permeability, and magnetization measurements of the ferromagnetic shape memory alloys Ni50+xMn27-xGa23 (x = 2.0, 2.5, 2.7) were performed. For x = 2.7, in which the martensite transition and the ferromagnetic transition occur at the same temperature, the martensite transition starting temperature TMs shift in magnetic fields around a zero magnetic field was estimated to be dTMs/...

Article history: Received: 23.12.2013. Received in revised form: 15.01.2014. Accepted: 15.01.2014. Subcritical austenite reverse transformation quenching was used to improve the mechanical properties of 30CrMnSi steel, and the microstructure and mechanical properties of the samples were analyzed by subcritical austenite reverse transformation quenching. Experimental results show that subcritica...

This work presents the results of comparison between simulations and experiments laser welding advanced multiphase steel. The numerical with different parameters were carried out using Sysweld software. geometry weld structural constituents as well stress distributions analyzed. simulated thermal cycles incorporated in JMatPro software to determine phase transformation kinetics during cooling. ...

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...

A generalized phase transformation kinetics model is used to understand the martensite to austenite transformation in a cold-rolled and annealed metastable AISI 301LN ultrafine-grained austenitic stainless steel. The model shows that the presence of interstitial nitrogen and heavy cold-rolling is important to promote fast transformation kinetics, through rapid nitrogen-diffusion and austenite n...

The production of complex multi-functional, high-strength parts is becoming increasingly important in the industry. Especially with small batch size, incremental flow forming processes can be advantageous. geometry and locally graded material properties currently depicts a great challenge process. At this point, usage closed-loop control for shape could feasible new solution. overall aim projec...