Effect of heat treatment on the structural transformations and properties of high-nitrogen chromium steels

2000 ◽  
Vol 42 (6) ◽  
pp. 221-225 ◽  
Author(s):  
V. M. Blinov ◽  
A. V. Elistratov ◽  
A. G. Kolesnikov ◽  
A. G. Rakhshtadt ◽  
A. I. Plokhikh ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Structural Transformations ◽  
High Nitrogen ◽  
Chromium Steels

The effect of phase transformations in the process of electrom-beam 3D-printing and post-built heat treatment on the peculiarities of plastic deformation and fracture of high nitrogen Cr-Mn steel

2021 ◽  
pp. 10-17
Author(s):  
E.G. Astafurova ◽  
◽  
K.A. Reunova ◽  
S.V. Astafurov ◽  
M.Yu. Panchenko ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Plastic Deformation ◽  
Electron Beam ◽  
Phase Composition ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Raw Material ◽  
High Nitrogen ◽  
Two Phase ◽  
Deformation And Fracture

We investigated the phase composition, plastic deformation and fracture micromechanisms of Fe-(25-26)Cr-(5-12)Mn-0.15C-0.55N (wt. %) high-nitrogen chromium-manganese steel. Obtained by the method of electron-beam 3D-printing (additive manufacturing) and subjected to a heat treatment (at a temperature of 1150°C following by quenching). To establish the effect of the electron-beam 3D-printing process on the phase composition, microstructure and mechanical properties of high-nitrogen steel, a comparison was made with the data for Fe-21Cr-22Mn-0.15C-0.53N austenitic steel (wt. %) obtained by traditional methods (casting and heat treatment) and used as a raw material for additive manufacturing. It was experimentally established that in the specimens obtained by additive manufacturing method, depletion of the steel composition by manganese in the electron-beam 3D-printing and post-built heat treatment contributes to the formation of a macroscopically and microscopically inhomogeneous two-phase structure. In the steel specimens, macroscopic regions of irregular shape with large ferrite grains or a two-phase austenite-ferrite structure (microscopic inhomogeneity) were observed. Despite the change in the concentration of the basic elements (chromium and manganese) in additive manufacturing, a high concentration of interstitial atoms (nitrogen and carbon) remains in steel. This contributes to the macroscopically heterogeneous distribution of interstitial atoms in the specimens - the formation of a supersaturated interstitial solid solution in the austenitic regions due to the low solubility of nitrogen and carbon in the ferrite regions. This inhomogeneous heterophase (ferrite-austenite) structure has high strength properties, good ductility and work hardening, which are close to those of the specimens of the initial high-nitrogen austenitic steel used as the raw material for additive manufacturing.

Structural transformations in high-nitrogen austenitic steel

1988 ◽  
Vol 31 (6) ◽  
pp. 451-454
Author(s):  
V. N. Timofeev ◽  
V. F. Sukhovarov ◽  
V. M. Blinov ◽  
I. L. Poimenov
Keyword(s):  
Austenitic Steel ◽  
Structural Transformations ◽  
High Nitrogen

Effect of Heat Treatment on TiNx Film Structure

2005 ◽  
Vol 480-481 ◽  
pp. 187-192
Author(s):  
S. Zerkout ◽  
M. Benkahoul ◽  
H. Sahraoui ◽  
S. Achour ◽  
A. Mosser
Keyword(s):  
Heat Treatment ◽  
Nitrogen Content ◽  
Thermal Instability ◽  
Lattice Parameter ◽  
Film Structure ◽  
High Nitrogen Content ◽  
High Nitrogen ◽  
Tin Films ◽  
Film Instability ◽  
Nitrogen Contents

TiN films with different nitrogen contents were deposited on glass and Si (100) substrates by d. c. magnetron reactive sputtering. The structure of the films was determined by Xray diffraction. It was found that heat treatment at 773 decreased the lattice parameter. A considerable thermal instability of over-stoichiometric films was observed after annealing films in air. This instability enhanced with increasing nitrogen content and is characterized by an abundant appearance of clear and dark disks in Scanning Electron Microscopy (SEM). Also, it was shown that the film instability does not come from an interfacial reaction but was observed when the TiNx layers present a (200) preferred orientation together with high nitrogen content.

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