In Situ Neutron Diffraction Studies of Phase Transformations in Si - Mn TRIP Steel

2005 ◽  
Vol 490-491 ◽  
pp. 275-280
Author(s):  
O. Muránsky ◽  
Petr Lukáš ◽  
Petr Šittner ◽  
Jozef Zrník ◽  
P. Jenčuš ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Trip Steel ◽  
High Strength ◽  
Phase Evolution ◽  
In Situ Monitoring ◽  
Trip Steels ◽  
Bainite Microstructure ◽  
In Situ Neutron Diffraction ◽  
Strength And Ductility

High strength and ductility of the TRIP steels is often attributed to the transformation induced plasticity effect resulting from the strain induced martensitic transformation of the retained austenite in the bainite microstructure. The present work reports results of in-situ neutron diffraction experiments focused on monitoring the phase evolution in two TRIP steel samples (two different thermomechanical treatments) subjected to tensile loading at room temperature. Comparison of the single lineprofile analysis of reactor data (TKSN-400 at NPI Rez) and multi lineprofile analysis of data obtained at spallation neutron source (diffractometer ENGIN-X at ISIS RAL Chilton) suggests that the former can be used in the first approximation for in-situ monitoring of the phase evolution in TRIP steels subjected to mechanical loads.

Deformation Behaviour of TRIP Steel Monitoring by in-Situ Neutron Diffraction

2011 ◽  
Vol 465 ◽  
pp. 390-394 ◽  
Author(s):  
Jozef Zrník ◽  
Ondrej Muránsky ◽  
Petr Šittner ◽  
E.C. Oliver
Keyword(s):  
Neutron Diffraction ◽  
Trip Steel ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Tensile Deformation ◽  
Deformation Behaviour ◽  
Tensile Load ◽  
Phase Evolution ◽  
In Situ Neutron Diffraction

The paper presents results of in-situ neutron diffraction experiments aimed on monitoring the phase evolution and load distribution in TRIP steel when subjected to tensile loading. Tensile deformation behaviour of TRIP steel with different initial microstructures showed that the applied tensile load is redistributed at the yield point and the harder retained austenite (Feγ) bears larger load then ferrite (Feα) matrix. After load partioning is finished, macroscopic yielding comes through simultaneous activity of the martensite transformation (in the austenite) and plastic deformation process in ferrite. The steel with higher volume fraction of retained austenite and less stronger ferrite appears to be a better TRIP steel having efficient structure for better plasticity purpose.

scholarly journals A study on the micromechanical behavior of Ti-55531 titanium alloy with lamellar microstructure by in-situ neutron diffraction

2020 ◽  
Vol 321 ◽  
pp. 11013
Author(s):  
Yimin Cui ◽  
Chaohua Li ◽  
Stefanus Harjo ◽  
Changsheng Zhang ◽  
Runguang Li ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Neutron Diffraction ◽  
Lamellar Microstructure ◽  
High Strength ◽  
Aviation Industry ◽  
Heavy Component ◽  
Stress Partitioning ◽  
In Situ Neutron Diffraction ◽  
Strength And Ductility

High strength titanium alloys are promising materials for heavy component parts in the aviation industry. The limited combination of strength and ductility requires an understanding of deformation and stress partitioning between constituent phases. The micromechanical behaviors of Ti-55531 titanium alloy with lamellar microstructure are investigated by in-situ neutron diffraction. The phase strain and lattice strain evolution of α and β phase at loading direction and transverse direction are determined. The results show that the micromechanical behaviors of oriented grains of α and β phase are obviously different. Furthermore, the stress partitioning between α and β phase during the deformation is clearly illustrated. It is found that the β matrix is subjected to higher stress than α precipitates. In addition, the intergranular and interphase microstress is quantitatively characterized. It is found that the intergranular microstress in the β phase grains is predominant among these microstresses. Combining the in-situ neutron diffraction with microstructure characterization, the present work provides a guide for further microstructure optimization.

scholarly journals Monitoring the phase evolution in LiCoO 2 electrodes during battery cycles using in‐situ neutron diffraction technique

2019 ◽  
Vol 67 (3) ◽  
pp. 344-352 ◽  
Author(s):  
Anirudha Jena ◽  
Po‐Han Lee ◽  
Wei Kong Pang ◽  
Kuang‐Che Hsiao ◽  
Vanessa K. Peterson ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Phase Evolution ◽  
In Situ Neutron Diffraction ◽  
Neutron Diffraction Technique

Optimising Sintering in Metal Injection Moulding Using In Situ Neutron Diffraction

2012 ◽  
Vol 706-709 ◽  
pp. 1737-1742 ◽  
Author(s):  
D.J. Goossens ◽  
R.E. Whitfield ◽  
A.J. Studer
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Neutron Diffraction ◽  
Injection Moulding ◽  
Phase Evolution ◽  
Rietveld Analysis ◽  
Formation Temperature ◽  
Lower Temperature ◽  
In Situ Neutron Diffraction

The phase evolution during the sintering of metal injection moulded stainless steel, 316Land 17-4PH, has been observed using in situ neutron diffraction and Rietveld analysis. The formationof the ferrite phase in the final product is associated with the production of -ferrite at high temperatures.Coexistence of phases at high temperature is thought to allow the segregation of alloyingelements, stabilising the ferrite to lower temperature. To prevent ferrite in the final products the sinteringmust occur at a lower temperature than that at which -ferrite is formed. An alternative regimeis proposed in which the temperature would be cycled around the formation temperature of -ferrite.

In Situ Neutron Diffraction Analysis of Phase Transformation Kinetics in TRIP Steel

2005 ◽  
Vol 502 ◽  
pp. 339-344 ◽  
Author(s):  
Jozef Zrník ◽  
O. Muránsky ◽  
Petr Lukáš ◽  
Petr Šittner ◽  
Z. Nový
Keyword(s):  
Neutron Diffraction ◽  
Trip Steel ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Internal Stresses ◽  
Austenite Transformation ◽  
Austenite Stability ◽  
Retained Austenite Stability ◽  
In Situ Neutron Diffraction

The precise characterization of the multiphase microstructure of low alloyed TRIP steels is of great importance for the interpretation and optimisation of their mechanical properties. In-situ neutron diffraction experiment was employed for monitoring of conditioned austenite transformation to ferrite, and also for retained austenite stability evaluation during subsequent mechanical loading. The progress in austenite decomposition to ferrite is monitored at different transformation temperatures. The relevant information on the course of transformation is extracted from neutron diffraction spectra. The integrated intensities of austenite and ferrite neutron diffraction profiles over the time of transformation are then assumed as a measure of the volume fractions of both phases in dependence on transformation temperature. Useful information was also obtained on retained austenite stability in TRIP steel during mechanical testing. The in-situ neutron diffraction experiments were conducted at two different diffractometers to assess the reliability of neutron diffraction technique in monitoring the transformation of retained austenite during room temperature tensile test. In both experiments the neutron investigation was focused on the volume fraction quantification of retained austenite as well as on internal stresses rising in structure phases due to retained austenite transformation.

scholarly journals Coexistence of Two Cubic-Lattice Co Matrices at High Temperatures in Co-Re-Cr-Ni Alloy Studied by Neutron Diffraction

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Přemysl Beran ◽  
Debashis Mukherji ◽  
Pavel Strunz ◽  
Ralph Gilles ◽  
Markus Hölzel ◽  
...  
Keyword(s):  
High Temperature ◽  
Neutron Diffraction ◽  
Diffusion Processes ◽  
Phase Evolution ◽  
Ni Alloy ◽  
The Matrix ◽  
The Face ◽  
Fcc Phase ◽  
In Situ Neutron Diffraction

In situ neutron diffraction measurements were performed during heating to high temperature and cooling for a Co-17Re-23Cr-25Ni alloy. The allotropic transformation of the Co matrix and the evolution of the low-temperature hexagonal and high-temperature cubic Co phases were studied. A surprising observation was the splitting of the face-centred cubic (fcc) Co phase peaks at high temperature during heating as well as cooling. The phase evolution was monitored, and an appearance of the secondary fcc phase could be linked to the formation of σ phase (Cr2Re3 type) associated with a compositional change in the matrix due to diffusion processes at high temperature.

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