Influence of Heat Treatment on the Phase Composition and Microhardness of Coatings Based on Ti3SiC2/ TiC

2020 ◽  
Vol 839 ◽  
pp. 137-143 ◽  
Author(s):  
Dastan Buitkenov ◽  
Bauyrzhan K. Rakhadilov ◽  
Dosym Erbolatuly ◽  
Zhuldyz Sagdoldina
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Structural Analysis ◽  
Tool Steel ◽  
Uniform Structure ◽  
Structure And Properties ◽  
Powder Coatings ◽  
Detonation Spraying ◽  
X Ray

The paper discusses the results of studying the structure and properties of powder coatings based on Ti3SiC2/TiC, obtained by the method of detonation spraying on the surface of the tool steel N9. It is determined that the coating has a uniform structure, cracks and delaminations are not observed. The results of X-ray structural analysis of coatings showed that the coating before annealing consists of phases TiC and Ti3SiC2. After annealing, the formation of TiO2 phases and an increase in the intensity of the (103) and (108) reflections of the Ti3SiC2 phases are observed. It is established that an increase in the content of the phases of Ti3SiC2 in coatings leads to an increase in the microhardness of coatings.

Heat treatememt effect on microstructure and mechanical properties of precipitation hardening elinvar alloy

2021 ◽  
pp. 68-73
Author(s):  
G.V. Shlyakhova ◽  
◽  
A.V. Bochkareva ◽  
M.V. Nadezhkin ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Phase Composition ◽  
Structural Analysis ◽  
Thermal Treatment ◽  
Precipitation Hardening ◽  
Physical And Mechanical Properties ◽  
Alloy Structure ◽  
Treatment Mode ◽  
Elinvar Alloy

This study presents experimental results of structural analysis, such as phase composition, grains size assessment, strength and hardness of Ni-SPAN-C alloy 902 after various heat treatment modes (hardening and aging for stress relaxation). A thermal treatment mode has been selected to obtain higher physical and mechanical properties of the elinvar alloy. It is shown that the improvement of the alloy structure in thermal treatment occurs due to the thermic stresses, as well as the formation and dissolution of intermetallides.

Regularities of the formation of the phase composition, structure and properties of the БрНХК 2.5-0.7-0.6 alloy during thermal and aerothermoacoustic treatments

2021 ◽  
pp. 71-75
Author(s):  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Phase Composition ◽  
Aging Treatment ◽  
Structure And Properties ◽  
Additional Increase ◽  
Composition Structure ◽  
Aerothermoacoustic Treatment

The influence of thermal and aerothermoacoustic treatments on the structure and mechanical properties of БрНХК bronze is considered. An increase in the strength and elasticity of the alloy is established by optimizing the thermal and aerothermoacoustic modes. The influence of the pre-aging treatment, the aging and aerothermoacoustic modes on the structure, the possibility of an additional increase in the mechanical properties of wire from БрНХК after aerothermoacoustic treatment are shown. Keywords: bronze, heat treatment, aerothermoacoustic treatment, microstructure, mechanical properties. [email protected]

Microstructure of Laser Cladded Cobalt-Based Alloy Coating on T10 Tool Steel

2011 ◽  
Vol 464 ◽  
pp. 694-697
Author(s):  
Qian Zhao ◽  
Yong Kang Zhang ◽  
Cheng Yun Cui ◽  
Xi Gui Cui ◽  
Jin Zhong Lu
Keyword(s):  
Phase Composition ◽  
Electron Microscope ◽  
Tool Steel ◽  
Aging Treatment ◽  
Alloy Coating ◽  
Main Phase ◽  
X Ray ◽  
Solidification Microstructures ◽  
Scanning Electron ◽  
Original Coating

Co-based alloy coating was fabricated by powder feeding laser cladding on T10 tool steel. The microstructure and phase composition were investigated by scanning electron microscope (SEM) and X-ray diffractometer (XRD). The results showed that the different solidification microstructures on the section, such as planar, cellular and dendrite formed from the interface to the surface. The main phase γ-Co and another phase Cr23C6 existed in the original coating, however, the main phase γ-Co was unchanged, and another phase was replaced by Cr7C3 accompanying with Co3C and Co4B precipitations after aging treatment.

Influence of Electrolyte-Plasma Hardening Technological Parameters on the Structure and Properties of Banding Steel 2

2020 ◽  
Vol 989 ◽  
pp. 787-792
Author(s):  
Erkezhan Erkinbekkyzy Tabieva ◽  
Laila Gylymmeddenovna Zhurerova ◽  
Daryn Baizhan
Keyword(s):  
Aqueous Solution ◽  
Phase Composition ◽  
Processing Conditions ◽  
Structure And Properties ◽  
Technological Parameters ◽  
Initial State ◽  
Plasma Surface ◽  
X Ray ◽  
Surface Quenching ◽  
Technological Processing

This work is devoted to the study of the influence of technological parameters of electrolytic-plasma surface quenching (EPQ) on the structure and surface properties of samples of bandage steel 2. In the electrolytic-plasma treatment, we performed the cathode mode in an electrolyte containing an aqueous solution of 20% carbamide (NH2)2CO and 20% sodium carbonate Na2CO3, on the installation of EPO with appropriate technological processing conditions. According to the electron-optical, X-ray phase studies, the phase composition of the steel after the EPQ was determined. This differs from the initial one by the formation of cementite and iron oxides on the surface of the samples. It is established that the microhardness of the bandage steel 2 after the EPQ during heating for 4 seconds increases 2.4 times, in comparison with the initial state.

scholarly journals Optimization of Quenching and Tempering Parameters for the Precipitation of M7C3 and MC Secondary Carbides and the Removal of the Austenite Retained in Vanadis 10 Tool Steel

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 627 ◽  
Author(s):  
Alejandro Gonzalez-Pociño ◽  
Florentino Alvarez-Antolin ◽  
Juan Asensio-Lozano
Keyword(s):  
Heat Treatment ◽  
Tool Steel ◽  
Retained Austenite ◽  
Process Variables ◽  
Tempering Temperature ◽  
X Ray ◽  
Secondary Carbides ◽  
Service Behavior ◽  
Hardness Values ◽  
Quenching And Tempering

Vanadis 10 steel is a powder metallurgy processed tool steel. The aim of the present study is to analyze the microstructural variation in this steel that takes place when the process variables related to the heat treatments of quenching and tempering are modified. Specifically, the destabilization of austenite, the precipitation of secondary carbides and the amount of retained austenite were analyzed. The research methodology employed was a Design of Experiments (DoE). The percentage and types of precipitated crystalline phases were determined by XRD, while the microstructure was revealed by means of SEM-energy-dispersive X-ray spectroscopy (EDX). The destabilization of austenite was favored by tempering at 600 °C for at least 4 h. These same conditions stimulated the removal of the retained austenite and the precipitation of M7C3 secondary carbides. For the precipitation of MC secondary carbides, it was necessary to maintain the steel at a temperature of 1100 °C for at least 8 h. The highest hardness values were obtained when the tempering temperature was lower (500 °C). Tempering in air or oil did not have a significant influence on the hardness of the steel after double or triple tempering at 500 or 600 °C. These results allow the manufacturers of industrial tools and components that use this type of steel in the annealed state as a material to define the most suitable quenching and tempering heat treatment to optimize the in-service behavior of these steels.

Synthesis of nanocomposite coating of electrodeposed amorphic layers of the Ni–P–W system

2020 ◽  
pp. 53-60
Author(s):  
A. V. Krasikov
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Differential Scanning Calorimetry ◽  
Phase Composition ◽  
Diffraction Analysis ◽  
Nanocomposite Coating ◽  
Nanocrystalline Phase ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray

The processes of the formation of the nanocomposite coating of Ni–11.5% P–5%W were studied during the heat treatment of amorphous electrodeposited layers. Using the method of differential scanning calorimetry, the temperature of the onset of crystallization of the nanocrystalline phase Ni3P was determined. X-ray diffraction analysis showed that heat treatment produces Ni3P phosphides and, presumably, Ni5P2, the size of which, according to electron microscopy, is 5–50 nm. The influence of the duration of heat treatment on the phase composition and microhardness of coatings is investigated.

The Structure and Properties of Low Activation Ferritic / Martensitic Steels

2005 ◽  
Vol 475-479 ◽  
pp. 1383-1386 ◽  
Author(s):  
Fei Zhao ◽  
Kuibei Wan ◽  
Farong Wan ◽  
Yi Long ◽  
Yongli Xu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Effect ◽  
Structural Materials ◽  
Fusion Reactors ◽  
Metallurgical Process ◽  
Structure And Properties ◽  
Martensitic Steels ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tensile Experiment

This paper reported the low activation martensitic steels which are being studied to develop the structural materials in fusion reactors. The steels were based on 9Cr1.5WVTa, but the effect of alloy elements was investigated by changing the amounts of alloy elements or adding other elements. The structure and properties of the steels were studied by tensile experiment, X-ray diffraction, SEM, TEM. Also the metallurgical process and heat treatment effect were discussed.

Effect of Heat Treatment on the Structure of Ni-P Electrocoatings

2015 ◽  
Vol 228 ◽  
pp. 148-152 ◽  
Author(s):  
B. Łosiewicz ◽  
Magdalena Popczyk
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Thermal Activation ◽  
Steel Substrate ◽  
Structure Change ◽  
Protective Atmosphere ◽  
Nickel Phosphide ◽  
Isothermal Heating ◽  
X Ray ◽  
Qualitative Phase

Activity of electrode material is strongly dependent on the structure, therefore, amorphous Ni-P electrocoatings deposited from a Watts type bath on the carbon steel substrate, were subjected to thermal activation through their isothermal heating under argon protective atmosphere at the temperature of 400, 500 and 800°C. After such a heat treatment, the investigations of the structure change of the Ni-P electrocoatings were carried out using X-ray qualitative phase analysis, which revealed the effect of thermal activation on the phase composition of the obtained coatings. It was found that after each applied thermal activation, the occurence of diphase system in the coating was observed which was consisted of nickel crystallites and nickel phosphide crystallites of the type Ni5P2.

scholarly journals Effect of Heat Treatment on the Microstructure and Phase Composition of ZrB2–MoSi2 Coating

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 779
Author(s):  
Marina Kovaleva ◽  
Igor Goncharov ◽  
Vseslav Novikov ◽  
Maxim Yapryntsev ◽  
Olga Vagina ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Lamellar Structure ◽  
Carbon Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mosi2 Coating ◽  
Α Al2o3 ◽  
Sprayed Coating ◽  
Scanning Electron

Composite ZrB2–MoSi2 coating modified by Y2O3 and Al was prepared by a new multi-chamber detonation accelerator (MCDS) on carbon/carbon composites. Postdeposition heat treatment of the samples at 1500 °C for 1 and 6 h was carried out in air. The effect of heat treatment on the microstructure and phase composition of the ZrB2–MoSi2 coating was investigated by scanning electron microscopy and X-ray diffraction phase analysis. The as-sprayed coating presented as a dense lamellar structure, composed of m-ZrO2, t-ZrO2, some hexagonal ZrB2, and cubic Al phases. The m-ZrO2, c-ZrO2, and h-(α-Al2O3) formed at 1500 °C. The coatings after heat treatment (1 and 6 h) exhibited a structure without cracks. The porosity (~1%) of the coating did not change after heat treatment. Thin, continuous, silica-rich film covered the surfaces of ZrO2 and Al2O3 particles, and could have played a role during heat treatment by acting as a grain lubricant for particle rearrangement.

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