scholarly journals Cryogenic heat treatment — a review of the current state

10.30544/238 ◽  
2017 ◽  
Vol 23 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Kamran Amini ◽  
Amin Akhbarizadeh ◽  
Sirus Javadpour
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Wear Resistance ◽  
Room Temperature ◽  
Liquid Nitrogen Temperature ◽  
Cast Irons ◽  
Current State ◽  
Noticeable Improvement ◽  
The Common ◽  
Cryogenic Heat Treatment

The deep cryogenic heat treatment is an old and effective heat treatment, performed on steels and cast irons to improve the wear resistance and hardness. This process includes cooling down to the liquid nitrogen temperature, holding the samples at that temperature and heating at the room temperature. The benefits of this process are significant on the ferrous materials, but recently some studies focused on other nonferrous materials. This study attempts to clarify the different behavior of some materials subjected to the deep cryogenic heat treatment, as well as explaining the common theories about the effect of the cryogenic heat treatment on these materials. Results showed that polymers exhibit different behavior regarding to their crystallinity, however the magnesium alloys, titanium alloys and tungsten carbide show a noticeable improvement after the deep cryogenic heat treatment due to their crystal structure.

scholarly journals 127I NQR and Crystal Structure Studies of [N(CH3)4]2 CdI4

2000 ◽  
Vol 55 (1-2) ◽  
pp. 225-229 ◽  
Author(s):  
Hideta Ishihara ◽  
Keizo Horiuchi ◽  
Thorsten M. Gesing ◽  
Shi-qi Dou ◽  
J.-Christian Buhl ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Order Phase Transition ◽  
Intensity Ratio ◽  
Room Temperature ◽  
Liquid Nitrogen Temperature ◽  
Temperature Phase ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase

The temperature dependence of 127I NQR and DSC as well as the crystal structure at room temperature of the title compound were determined. This compound shows a first-order phase transition of an order-disorder type at 245 K. Eight 127I(v1:m = ±1/2 ↔ ±3/2) NQR lines of 79.57, 81.86, 82.56, 83.36, 84.68, 87.72, 88.34, and 88.86 MHz, and corresponding eight 127I(v2: m = ±3/2 ↔±5/2) NQR lines were observed at liquid nitrogen temperature. Three 127I(υi) NQR lines wfth an intensity ratio of 1:1:2 in the order of decreasing frequency were observed just above the transition point and two NQR lines except for the middle-frequency line disappeared around room temperature. This temperature behavior of NQR lines is very similar to that observed in [N(CH3)4]2Hgl4. Another first-order phase transition takes place at 527 K. The structure of the room-temperature phase was redetermined: orthorhombic, Pnma, Z = 4, a = 1342.8(3), b = 975.7(2), c = 1696.5(3) pm. The NQR result of three lines with an intensity ratio of 1:1:2 is in agreement with this structure. The thermal displacement parameters of atoms in both cations and anions are large.

HEAT-TREATMENT INFLUENCE ON THE MAGNETIC AND ELECTRIC PROPERTIES OF HIGH-TcYBa2Cu3O7−δ SUPERCONDUCTOR

1996 ◽  
Vol 10 (20) ◽  
pp. 955-961
Author(s):  
LAUREAN HOMORODEAN ◽  
IULIU POP ◽  
ION BURDOI
Keyword(s):  
Heat Treatment ◽  
Electrical Resistivity ◽  
Magnetic Susceptibility ◽  
Room Temperature ◽  
Liquid Nitrogen Temperature ◽  
Superconducting Phase ◽  
Superconducting Transition ◽  
Temperature Dependences ◽  
Magnetic And Electric Properties ◽  
Very High

The changes in the temperature dependences of the magnetic susceptibility and the electrical resistivity of a very-high-T c superconducting YBa 2 Cu 3 O 7−δ sample during the thermal cycling between the liquid-nitrogen temperature and the room temperature are studied. Some singularities corresponding to the superconducting transition, the possible existence of a super-high-temperature superconducting phase and the migration of the oxygen atoms in the Cu-O chains are emphasized on these dependencies.

Effect of heat treatment on the wear resistance of cast irons

2016 ◽  
Vol 58 (4) ◽  
pp. 306-311 ◽  
Author(s):  
Enbiya Türedi
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Cast Irons

Effect of heat treatment on the wear resistance of manganese cast irons

1968 ◽  
Vol 10 (5) ◽  
pp. 389-391
Author(s):  
A. N. Volkov ◽  
V. B. Lyadskii ◽  
D. I. Stanchev
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Cast Irons

Cryogenic heat treatment of the ferrous materials – a review of the current state

2016 ◽  
Vol 113 (6) ◽  
pp. 611 ◽  
Author(s):  
Kamran Amini ◽  
Amin Akhbarizadeh ◽  
Sirus Javadpour
Keyword(s):  
Heat Treatment ◽  
Current State ◽  
Cryogenic Heat Treatment

Optimizing heat treatment and wear resistance of high chromium cast irons using computational thermodynamics

Wear ◽  
2011 ◽  
Vol 271 (9-10) ◽  
pp. 1813-1818 ◽  
Author(s):  
E. Albertin ◽  
F. Beneduce ◽  
M. Matsumoto ◽  
I. Teixeira
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Cast Irons ◽  
Computational Thermodynamics ◽  
High Chromium

Characterization of Co-Cr-Mo Alloys Used in HIP Implant Articulating Surfaces

1996 ◽  
Vol 441 ◽  
Author(s):  
R. Varano ◽  
J. D. Bobyn ◽  
S. Yue
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Boundary ◽  
Room Temperature ◽  
Volume Fraction ◽  
Face Centered Cubic ◽  
Hip Implant ◽  
Fine Microstructure ◽  
Face Centered

AbstractThe microstructure, crystallography and mechanical properties of a wrought (ASTM F-1537) Co-Cr- Mo hip implant alloy were studied in this work. The effects of carbon content, heat treatment and room temperature compression on the above characteristics were also analyzed. Metallography of the asreceived material revealed the presence of ‘twins’ in a relatively fine microstructure with some randomly distributed grain boundary carbides. Heat treatment of the specimens produced a coarser microstructure, more uniformly distributed grain boundary carbides and annealing twins. Neutron diffraction of the specimens, which were deformed at room temperature, exhibited an increase in the volume fraction of the more stable Co-hexagonal closed-packed (HCP) crystal structure, due to a strain-induced transformation (SIT) from the metastable Co-face-centered cubic (FCC) crystal structure. It was also seen that the higher C specimens, as well as the heat treated specimens, possessed a lower volume fraction of the HCP phase. It was found, through shear punch testing, that the deformed specimens exhibited higher mechanical properties without any significant losses to the ductility of the material.

Sign in / Sign up

Export Citation Format

Share Document