Characteristics of structural phase transformations in high-alloy steels subjected to laser heat treatment

1987 ◽  
Vol 17 (12) ◽  
pp. 1616-1620
Author(s):  
I N Zavestovskaya ◽  
Valerii I Igoshin ◽  
V A Katulin ◽  
S V Kayukov ◽  
A L Petrov
Keyword(s):  
Heat Treatment ◽  
Phase Transformations ◽  
Structural Phase ◽  
Laser Heat Treatment ◽  
High Alloy ◽  
Laser Heat ◽  
Alloy Steels ◽  
Structural Phase Transformations ◽  
High Alloy Steels

Structural and Phase Changes in Tin Coatings Subjected to Thermal Treatment

2020 ◽  
Vol 839 ◽  
pp. 131-136
Author(s):  
Aidar Kenesbekov ◽  
Bauyrzhan K. Rakhadilov ◽  
Rauan Kozhanova ◽  
Olga Stepanova
Keyword(s):  
Heat Treatment ◽  
Thermal Treatment ◽  
Phase Transformations ◽  
Thermal Annealing ◽  
Phase State ◽  
Structural Phase ◽  
Phase Changes ◽  
Structural Phase State ◽  
Tin Coatings ◽  
Structural Phase Transformations

This work presents the experimental results of the study of the effect of heat treatment on the structural-phase state of TiN coatings on the surface of 67KH5B alloy. It is determined that thermal annealing leads to structural phase transformations at the interface between the coating and the substrate. It was established that after annealing at Т=800 °С, due to the redistribution of the coating elements and the substrate, a modified coating is formed consisting of the TiN, Ti2N and NiTi phases.

Structural-phase transformations in SiOx films in the course of vacuum heat treatment

2003 ◽  
Vol 37 (1) ◽  
pp. 97-102 ◽  
Author(s):  
I. P. Lisovskyy ◽  
I. Z. Indutnyy ◽  
B. N. Gnennyy ◽  
P. M. Lytvyn ◽  
D. O. Mazunov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Phase Transformations ◽  
Structural Phase ◽  
Vacuum Heat Treatment ◽  
Structural Phase Transformations

scholarly journals Identification of the features of structural-phase transformations in the processing of waste from the production of high-alloy steels

2021 ◽  
Vol 4 (12(112)) ◽  
pp. 33-38
Author(s):  
Viacheslav Borysov ◽  
Tetiana Solomko ◽  
Mykhail Yamshinskij ◽  
Ivan Lukianenko ◽  
Bohdan Tsymbal ◽  
...  
Keyword(s):  
Solid Solution ◽  
Phase Composition ◽  
Carbon Content ◽  
Structural Phase ◽  
Alloying Elements ◽  
Technological Parameters ◽  
High Alloy ◽  
Study Results ◽  
Alloy Steels ◽  
High Alloy Steels

This paper reports a study into the peculiarities of the structural-phase composition of the alloy obtained by using anthropogenic waste from the production of high-alloy steels involving reduction melting. That is necessary for determining the technological parameters that could help decrease the loss of alloying elements in the process of obtaining and using a doped alloy. This study has shown that at an O:C ratio in the charge of 1.84, the alloy consisted mainly of the solid solution of carbon and alloying elements in α-Fe. The manifestation of Fe3C C carbide with alloying elements as substitution atoms was of relatively weak intensity. At the O:C ratios in the charge of 1.42 and 1.17, there was an increase in the intensity of the Fe3C carbide manifestation. At the same time, the emergence of the carbide compounds W2C·Mo2C and WC was identified. Several phases with different content of alloying elements were present in the microstructure images. Cr content in the examined areas changed in the range of 0.64–33.86 % by weight; W content reached 41.58 % by weight; Mo –19.53 % by weight; V – 18.55 % by weight; Co – 3.95 % by weight. The carbon content was in the range of 0.28–2.43 % by weight. Analysis of the study results reveals that the most favorable ratio of O:C in the charge was 1.42. At the same time, the phase composition was dominated by a solid solution of the alloying elements and carbon in α-Fe. The share of the residual carbon concentrated in the carbide component was in the range of 0.52–2.11 % by weight, thereby ensuring the required reduction capability of the alloy when used. The study reported here has made it possible to identify new technological aspects of obtaining an alloy by utilizing anthropogenic waste, and whose indicators provide for the possibility of replacing part of standard ferroalloys when smelting steels without strict restrictions on carbon content.

Optimization of the Case Depth of a Cylinder Made With 4340 Steel by a Control of the Laser Heat Treatment Parameters

2018 ◽  
Author(s):  
Rachid Fakir ◽  
Noureddine Barka ◽  
Jean Brousseau
Keyword(s):  
Heat Treatment ◽  
Numerical Model ◽  
Surface Temperature ◽  
Laser Power ◽  
Case Depth ◽  
Maximum Temperature ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
4340 Steel ◽  
Cylindrical Workpiece

This paper presents a numerical model able to control the temperature distribution along a 4340 steel cylinder heat-treated with Nd: YAG laser. The numerical model developed using the numerical finite element method, was based on a study of surface temperature variation and the adjustment of this temperature by a control of the heat treatment laser power. The proposed analytical approach was built gradually by (i) the development of a numerical model of laser heat treatment of the cylindrical workpiece, (ii) an analysis of the results of simulations and experimental tests, (iii) development of a laser power adjustment approach, and (iv) proposal of a laser power control predictor using neural networks. This approach was made possible by highlighting the influence of the fixed (non-variable) parameters of the laser heat treatment on the case depth, and has shown that it is possible by controlling the laser parameters to homogenize the distribution of the maximum temperature reached on the surface for a uniform case depth. The feasibility and effectiveness of the proposed approach leads to a reliable and accurate model able to guarantee a uniform surface temperature and a regular case depth for a cylindrical workpiece of a length of 50-mm and with a diameter of between 16-mm and 22-mm.

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