Carbide formation in the niobium-microalloyed 15Kh2MFA steel during heat treatment

2020 ◽  
Author(s):  
V. G. Teplukhin ◽  
A. S. Tsvetkov ◽  
A. I. Popov ◽  
D. N. Shabalin
Keyword(s):  
Heat Treatment ◽  
Carbide Formation ◽  
15Kh2mfa Steel

Structure of welded joints of 15Kh2MFA steel completed with low carbon surfacing without heat treatmen

2020 ◽  
pp. 35-43
Author(s):  
M. N. Timofeev ◽  
S. N. Galyatkin ◽  
R. I. Samoylenko ◽  
Yu. M. Markova
Keyword(s):  
Heat Treatment ◽  
Base Metal ◽  
Welded Joints ◽  
Welded Joint ◽  
Chemical Elements ◽  
Steel Structures ◽  
Low Carbon ◽  
15Kh2mfa Steel

The paper studies the 15Kh2MFA steel structures at various sections of the welded joint performed without heat treatment after welding with low-carbon surfacing. It is shown that there are three zones in lowcarbon surfacing, which differ in the content of chemical elements passing from the base metal to the deposited one, as well as in the tendency to form hardened structures during welding.

Production of Silicon Carbide via Grinding and Heat Treatment Process

2013 ◽  
Vol 594-595 ◽  
pp. 740-744
Author(s):  
Hidayu Jamil Noorina ◽  
W.H. Xian ◽  
W.M. Arif ◽  
Che Pa Faizul ◽  
Mohd Zaki Ruhiyuddin
Keyword(s):  
Heat Treatment ◽  
Silicon Carbide ◽  
Treatment Process ◽  
Raw Materials ◽  
Graphite Powder ◽  
Planetary Mill ◽  
Waste Glass ◽  
Raw Material ◽  
Carbide Formation ◽  
Heat Treatment Process

This study is to determine the properties and characterization of silicon carbide via grinding and heat treatment process. In this study, the raw materials used were waste glass and graphite powder. Silicon carbide was produced by milling and mixing waste glass and graphite powder in different grinding mills; planetary mill and ring mill. The samples were then heat treated at 700 °C for 1 hour soaking time. Two types of characterization procedures were completed to determine the properties and microstructure of silicon carbide. Formation of silicon carbide was only formed through grinding by planetary mill but not ring mill. This may due to the grinding mechanism of both mills. Due to the simple and low cost of raw material to form silicon carbide, silicon carbide has high potential to be one of the commercialized products. It has the potential in reducing waste and improves the environment quality.

Effect of the simultaneous Ti and W addition on the microstructure and wear behavior of a high chromium white cast iron

2019 ◽  
Vol 116 (6) ◽  
pp. 602 ◽  
Author(s):  
Francisco Vapeani Guerra ◽  
Arnoldo Bedolla-Jacuinde ◽  
Jorge Zuno-Silva ◽  
Ignacio Mejia ◽  
Edgar Cardoso-Legorreta ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Abrasive Wear ◽  
Wear Behavior ◽  
Wear Test ◽  
Abrasive Wear Resistance ◽  
Carbide Formation ◽  
The Matrix ◽  
Bulk Hardness ◽  
Primary Carbides

The present work analyzes the effect of 0.7%Ti and 1.7%W addition to a 17% chromium white iron in as-cast condition and after destabilization heat treatment. These alloys are commonly used in applications where a high abrasive wear resistance is required. For this reason, in addition to the characterization, a complementary wear test was performed. The alloys were characterized by optical and electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. The simultaneous Ti and W addition promoted the (Ti,W)C primary carbides formation which grow in the early stages of solidification. These carbides were found well distributed in the iron matrix with an average hardness value of 2450 HV. Moreover, tungsten was found partially distributed in the different phases increasing the microhardness by solid solution and refining the eutectic carbide. These microstructural modifications resulted in the increase of the bulk hardness and abrasive wear resistance of the alloyed iron. After destabilization heat treatment, the carbide precipitation and the matrix transformation produced a secondary hardening reducing the wear losses. Based in the results of the present study, the simultaneous addition of these elements to promote the (Ti,W)C carbide formation during solidification represents an effective method to increase the hardness and wear resistance of these kind of alloys via small additions.

The Precipitation of Si in AlCuSi Thin Films

1973 ◽  
Vol 31 ◽  
pp. 34-35 ◽  
Author(s):  
R. M. Anderson
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Heat Treatment ◽  
Solid Solution ◽  
Integrated Circuit ◽  
Copper Film ◽  
Solution Concentration ◽  
X Ray ◽  
Silicon Thin Films ◽  
Before And After

Aluminum-copper-silicon thin films have been considered as an interconnection metallurgy for integrated circuit applications. Various schemes have been proposed to incorporate small percent-ages of silicon into films that typically contain two to five percent copper. We undertook a study of the total effect of silicon on the aluminum copper film as revealed by transmission electron microscopy, scanning electron microscopy, x-ray diffraction and ion microprobe techniques as a function of the various deposition methods.X-ray investigations noted a change in solid solution concentration as a function of Si content before and after heat-treatment. The amount of solid solution in the Al increased with heat-treatment for films with ≥2% silicon and decreased for films <2% silicon.

The influence of heat treatment on the fiber/matrix interface in a SiC-reinforced glassceramic

1988 ◽  
Vol 46 ◽  
pp. 742-743
Author(s):  
E. Bischoff ◽  
O. Sbaizero
Keyword(s):  
Heat Treatment ◽  
Aluminum Silicate ◽  
Lithium Aluminum ◽  
Interfacial Region ◽  
Specimen Preparation ◽  
Crack Wake ◽  
Pull Out ◽  
Annealed Material ◽  
Ultrasonic Drilling ◽  
Fiber Matrix Interface

Fiber or whisker reinforced ceramics show improved toughness and strength. Bridging by intact fibers in the crack wake and fiber pull-out after failure contribute to the additional toughness. These processes are strongly influenced by the sliding and debonding resistance of the interfacial region. The present study examines the interface in a laminated 0/90 composite consisting of SiC (Nicalon) fibers in a lithium-aluminum-silicate (LAS) glass-ceramic matrix. The material shows systematic changes in sliding resistance upon heat treatment.As-processed samples were annealed in air at 800 °C for 2, 4, 8, 16 and 100 h, and for comparison, in helium at 800 °C for 4 h. TEM specimen preparation of as processed and annealed material was performed with special care by cutting along directions having the fibers normal and parallel to the section plane, ultrasonic drilling, dimpling to 100 pm and final ionthinning. The specimen were lightly coated with Carbon and examined in an analytical TEM operated at 200 kV.

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