martensitic phase
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PAMM ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Sonja Uebing ◽  
Dominik Brands ◽  
Lisa Scheunemann ◽  
Jörg Schröder

2021 ◽  
Vol 11 (22) ◽  
pp. 10886
Author(s):  
Axel Griesche ◽  
Beate Pfretzschner ◽  
Ugur Alp Taparli ◽  
Nikolay Kardjilov

Polychromatic and wavelength-selective neutron transmission radiography were applied during bead-on-plate welding on 5 mm thick sheets on the face side of martensitic low transformation temperature (LTT) steel plates using gas tungsten arc welding (GTAW). The in situ visualization of austenitization upon welding and subsequent α’-martensite formation during cooling could be achieved with a temporal resolution of 2 s for monochromatic imaging using a single neutron wavelength and of 0.5 s for polychromatic imaging using the full spectrum of the beam (white beam). The spatial resolution achieved in the experiments was approximately 200 µm. The transmitted monochromatic neutron beam intensity at a wavelength of λ = 0.395 nm was significantly reduced during cooling below the martensitic start temperature Ms since the emerging martensitic phase has a ~10% higher attenuation coefficient than the austenitic phase. Neutron imaging was significantly influenced by coherent neutron scattering caused by the thermal motion of the crystal lattice (Debye–Waller factor), resulting in a reduction in the neutron transmission by approx. 15% for monochromatic and by approx. 4% for polychromatic imaging.


2021 ◽  
Vol 204 ◽  
pp. 114153
Author(s):  
Hui Fu ◽  
Shuqing Yuan ◽  
Wanting Sun ◽  
Jianquan Wan ◽  
K.C. Chan ◽  
...  

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1316
Author(s):  
Truong Duc Trinh ◽  
Takeshi Iwamoto

In transformation-induced plasticity (TRIP) steel, the strain-induced martensitic transformation (SIMT) has a close relationship with the shear band formation. At a small length scale such as that of a crystal, the explicit analysis of the shear band structure with the formed microstructure is quite important for an adequate understanding of the SIMT. Here, a study on the microstructures formed by SIMT, related to shear band formation in both single and polycrystal TRIP steels, is presented. The constitutive equation for single crystal TRIP steel considering the transformation strain on each variant system is derived based on a rate-dependent crystal plasticity theory. To express the martensitic transformation, the cellular automata approach, including a transformation criterion acting as a local rule, is introduced. Numerical simulation is conducted with patterning processes of the martensitic phase at an infinite medium under the plane strain tension. It is found that the similar distributions of the plastic strain and the martensitic phase are dependent on the initial crystal orientation and appear as the shear band structures. In addition, the sizes of embryo and cell strongly influence the shear band formation and the martensitic volume fraction of crystal TRIP steel.


Author(s):  
Lavanya Kunduru ◽  
N. Yedukondalu ◽  
S. C. Rakesh Roshan ◽  
Suresh Sripada ◽  
M. Sainath ◽  
...  

2021 ◽  
Vol 140 (2) ◽  
pp. 175-180
Author(s):  
Z. Mostefa ◽  
F. Cherifi ◽  
A. Boukra ◽  
Z.F. Meghoufel ◽  
A. Boukortt

2021 ◽  
Vol 85 (7) ◽  
pp. 751-754
Author(s):  
A. V. Mashirov ◽  
A. P. Kamantsev ◽  
D. D. Kuznetsov ◽  
V. V. Koledov ◽  
V. G. Shavrov

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