Autor: Sarnek, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Reverse Transformation of Deformation Induced Martensite in Austenitic Stainless Steel
Autorzy:: Dryzek, E.
Sarnek, M.
Powiązania:: https://bibliotekanauki.pl/articles/1196051.pdf
Data publikacji:: 2014-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
81.05.Bx
Opis:: Cumulative isochronal annealing of stainless steel 1.4307 samples deformed by compression was investigated using the Doppler broadening of the annihilation line measurements. Higher level of plastic deformation is accompanied not only by higher concentration of defects but also by higher amount of α' martensite. The annealing studies revealed creation of defects in the temperature range between 450C and 650C pointing out the reverse transition of α' martensite to austenite. This is confirmed by magnetic susceptibility and microhardness measurements.
Źródło:: Acta Physica Polonica A; 2014, 125, 3; 710-713
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Positron annihilation studies of high-manganese steel deformed by rolling
Autorzy:: Dryzek, E.
Sarnek, M.
Wróbel, M.
Powiązania:: https://bibliotekanauki.pl/articles/146593.pdf
Data publikacji:: 2015
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: plastic deformation
positron annihilation
high-manganese steel
Opis:: Positron annihilation spectroscopy (PAS) has been used to study the annealing behavior of cold rolled Fe – 21 wt% Mn steel with 0.05 wt% C. After the initial annealing of defects shown by Doppler broadening of the annihilation line, a slight increase in the annihilation line shape parameter, i.e., the so-called S parameter and then its decrease in the temperature range between 225◦C and 450◦C indicates generation of new defects and their subsequent annealing. This temperature range coincides with X-ray diffraction measurements, which indicate reversion of deformation-induced ε-martensite. However, for annealing in this temperature range with slow cooling of the sample, the formation of ferrite already starts. The results are compared with our previous results for deformed austenitic stainless steel 1.4301 (EN) where only reversion of deformation-induced α'-martensite was detected.
Źródło:: Nukleonika; 2015, 60, No. 4, part 1; 709-712
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Annealing behaviour of plastically deformed stainless steel 1.4307 studied by positron annihilation methods
Autorzy:: Dryzek, E.
Sarnek, M.
Siemek, K.
Powiązania:: https://bibliotekanauki.pl/articles/148014.pdf
Data publikacji:: 2013
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: plastic deformation
positron annihilation
stainless steel
Opis:: Isochronal and isothermal annealing of stainless steel 1.4307 samples deformed by compression were investigated using Doppler broadening measurements of the annihilation line. We made an attempt to describe the obtained dependencies in terms of vacancy migration and sinking to the grain boundaries. The model assumed spherical grains with a homogeneous initial distribution of vacancies. The model was capable of following the isochronal annealing data quite accurately. However, the obtained activation energy of vacancy migration equal to 0.44 plus or minus 0.05 eV seemed too low. The isothermal annealing dependency was reproduced less precisely. The reason for this may be the presence of the alfa'-martensite particles in the samples, which can introduce additional defects seen by positrons in the temperature range in which the martensite reversion takes place.
Źródło:: Nukleonika; 2013, 58, 1; 215-219
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Estimate of the Crystallite Size for Nanocrystalline AISI 316L Stainless Steel and Armco Iron Processed by Hydrostatic Extrusion Using Variable Energy Positron Beam
Autorzy:: Sarnek, M.
Dryzek, E.
Horodek, P.
Pachla, W.
Powiązania:: https://bibliotekanauki.pl/articles/1033950.pdf
Data publikacji:: 2017-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: stainless steel
Armco iron
plastic deformation
hydrostatic extrusion
variable energy positron beam
X-ray diffraction
Opis:: The paper presents the results of research of nanocrystalline AISI 316L type stainless steel and nanocrystalline Armco pure iron processed by severe plastic deformation using hydrostatic extrusion method. Surface and subsurface of the steel samples extruded at different pressure were investigated using variable energy positron beam. It enabled us to determine the positron diffusion length and compare its values with those for annealed AISI 304 stainless steel. Furthermore positron lifetime and microhardness were measured for all the samples and X-ray diffraction was used to estimate the crystallite size.
Źródło:: Acta Physica Polonica A; 2017, 132, 5; 1598-1601
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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