scholarly journals FEATURES OF FORMATION OF CRYSTALLOGRAPHIC TEXTURE AND PROPERTIES IN Ti-3Al-2.5V TITANIUM ALLOY DURING TUBES MANUFACTURE

2019 ◽  
pp. 105-112
Author(s):  
V.S. Vakhrusheva ◽  
N.V. Hruzin ◽  
D.G. Malykhin
Keyword(s):  
Heat Treatment ◽  
Reduction Rate ◽  
Stress Relief ◽  
Tangential Component ◽  
Maximum Amount ◽  
Formation Processes ◽  
Texture Formation ◽  
Large Share ◽  
Main Factors ◽  
Diameter Reduction

Texture formation processes at all technological stages of tube manufacture were considered. It has been established that at the stage of hot deformation and manufacture of TREX tubes, tangential and radial textures are formed, a large share of tangential component of the texture. Influence of main factors of the technological process on formation of texture and properties was established. Conditions for formation of a maximum amount of radial texture in tubes which ensure improvement of service properties of tubes were determined. To create maximum amount of radial texture in tubes, total reduction rate in passes and the wall to diameter reduction ratio (factor Q) are important. The reduction rate should be increased, especially in the last passes, to 75…85%. Heat treatment (stress relief annealing) practically does not change the tube texture.

A Study on stress relief heat treatment (Report 1)

1967 ◽  
Vol 36 (2) ◽  
pp. 140-145
Author(s):  
Zinkichi Tanaka ◽  
Tadayoshi Obata
Keyword(s):  
Heat Treatment ◽  
Stress Relief

A Study on Stress Relief Heat Treatment (Report 4)

1970 ◽  
Vol 39 (1) ◽  
pp. 49-54 ◽  
Author(s):  
Jinkichi Tanaka ◽  
Tadayoshi Obata
Keyword(s):  
Heat Treatment ◽  
Stress Relief

scholarly journals Effect of Optical and Morphological Control of Single-Structured LEC Device

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 843
Author(s):  
Woo Jin Jeong ◽  
Jong Ik Lee ◽  
Hee Jung Kwak ◽  
Jae Min Jeon ◽  
Dong Yeol Shin ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Surface Roughness ◽  
Surface Properties ◽  
High Efficiency ◽  
High Surface ◽  
Reduction Rate ◽  
Operating Characteristics ◽  
Emission Layer ◽  
Light Emitting ◽  
Stable Operating

We investigated the performance of single-structured light-emitting electrochemical cell (LEC) devices with Ru(bpy)3(PF6)2 polymer composite as an emission layer by controlling thickness and heat treatment. When the thickness was smaller than 120–150 nm, the device performance decreased because of the low optical properties and non-dense surface properties. On the other hand, when the thickness was over than 150 nm, the device had too high surface roughness, resulting in high-efficiency roll-off and poor device stability. With 150 nm thickness, the absorbance increased, and the surface roughness was low and dense, resulting in increased device characteristics and better stability. The heat treatment effect further improved the surface properties, thus improving the device characteristics. In particular, the external quantum efficiency (EQE) reduction rate was shallow at 100 °C, which indicates that the LEC device has stable operating characteristics. The LEC device exhibited a maximum luminance of 3532 cd/m2 and an EQE of 1.14% under 150 nm thickness and 100 °C heat treatment.

Optimum Time and Temperature for Stress Relief Heat Treatment of Stainless Steel Wire

1973 ◽  
Vol 52 (6) ◽  
pp. 1171-1175 ◽  
Author(s):  
Michael R. Marcotte
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Steel Wire ◽  
Stress Relief ◽  
Stainless Steel Wire ◽  
Optimum Time ◽  
Dependent Variables

With the use of springback and recovery as dependent variables, the effects of time and temperature of stress relief heat treatment of stainless steel wire were studied. Stainless steel springs exposed to a stress relief heat treatment of 750 F for 11 minutes appear to have significantly improved spring properties.

scholarly journals Iodine-Loaded Calcium Titanate for Bone Repair with Sustainable Antibacterial Activity Prepared by Solution and Heat Treatment

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2199
Author(s):  
Seiji Yamaguchi ◽  
Phuc Thi Minh Le ◽  
Seine A. Shintani ◽  
Hiroaki Takadama ◽  
Morihiro Ito ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Antibacterial Activity ◽  
Bone Repair ◽  
Reduction Rate ◽  
Calcium Titanate ◽  
Apatite Formation ◽  
Oh Groups ◽  
Long Term Stability ◽  
Combined Solution

In the orthopedic and dental fields, simultaneously conferring titanium (Ti) and its alloy implants with antibacterial and bone-bonding capabilities is an outstanding challenge. In the present study, we developed a novel combined solution and heat treatment that controllably incorporates 0.7% to 10.5% of iodine into Ti and its alloys by ion exchange with calcium ions in a bioactive calcium titanate. The treated metals formed iodine-containing calcium-deficient calcium titanate with abundant Ti-OH groups on their surfaces. High-resolution XPS analysis revealed that the incorporated iodine ions were mainly positively charged. The surface treatment also induced a shift in the isoelectric point toward a higher pH, which indicated a prevalence of basic surface functionalities. The Ti loaded with 8.6% iodine slowly released 5.6 ppm of iodine over 90 days and exhibited strong antibacterial activity (reduction rate >99%) against methicillin-resistant Staphylococcus aureus (MRSA), S. aureus, Escherichia coli, and S. epidermidis. A long-term stability test of the antibacterial activity on MRSA showed that the treated Ti maintained a >99% reduction until 3 months, and then it gradually decreased after 6 months (to a 97.3% reduction). There was no cytotoxicity in MC3T3-E1 or L929 cells, whereas apatite formed on the treated metal in a simulated body fluid within 3 days. It is expected that the iodine-carrying Ti and its alloys will be particularly useful for orthopedic and dental implants since they reliably bond to bone and prevent infection owing to their apatite formation, cytocompatibility, and sustainable antibacterial activity.

400. Factors influencing the keeping quality of ghee

1949 ◽  
Vol 16 (3) ◽  
pp. 356-362 ◽  
Author(s):  
D. P. Persai ◽  
C. R. Barnicoat
Keyword(s):  
Heat Treatment ◽  
Bacterial Culture ◽  
Storage Life ◽  
Summer Temperature ◽  
Final Temperature ◽  
Marked Influence ◽  
Factors Influencing ◽  
Keeping Quality ◽  
Main Factors

Of the four main factors commonly regarded as influencing keeping properties of ghee, viz. moisture content, acidity, heat treatment and type of bacterial culture used in souring, the heat treatment was found to be the most important.In general, the higher the final temperature (110° C. and higher) attained during evaporation, the better were the keeping properties of the product, providing that the butter had been heated in contact with curd, boiled as rapidly as possible, and given a minimum amount of stirring.The improved keeping properties conferred on ghee heated to 110–150° C. were promoted by antioxidants (apparently phospholipids) extracted from the curd during cooking.Initial acidity and moisture contents had no effect on storage life of ghee at 38° C., and the practice of grading ghee according to its acidity would appear to be of questionable value. Souring of milk to give 2·5–3·0% lactic acid and the accompanying desirable flavour did not detract from the keeping quality of the ghee made from it.The type of bacterial culture used for souring had only slight influence on keeping quality of ghee, but a marked influence on flavour.Storage life of ghee at 38° C. (‘Indian summer temperature’) could be predicted with fair accuracy from its rate of oxidation at 100° C. in a ‘Swift oxidation tester’.

New Results of the Heat-Treated CuZn39Pb3 Brass Behavior and Resistance to Cavitation Erosion

2021 ◽  
Vol 890 ◽  
pp. 173-180
Author(s):  
Ilare Bordeaşu ◽  
Nicușor Alin Sîrbu ◽  
Iosif Lazăr ◽  
Ion Mitelea ◽  
Cristian Ghera ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Cavitation Erosion ◽  
Stress Relief ◽  
Air Cooling ◽  
Water Cooling ◽  
Characteristic Parameters ◽  
Volume Heat ◽  
Heat Treated ◽  
Hardness Increase

The paper presents the results of the behavior and resistance to the erosion by vibrating cavitation of the CuZn39Pb3 brass, obtained by quenching the volume heat treatment from 800°C with water cooling, followed by the stress-relief to 250°C, with air cooling. Comparison with both the delivery status and the naval brass (used for ship propellers), based on the characteristic parameters values, recommended by the ASTM G32 standards and used in the Cavitation Laboratory of the Polytechnic University of Timisoara, shows that the hardness increase resulted from the heat treatment led to a significant increase of resistance to vibrating cavitation.

scholarly journals The Influence of the Post-Weld Heat Treatment on the Microstructure of Inconel 625/Carbon Steel Bimetal Joint Obtained by Explosive Welding

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 246 ◽  
Author(s):  
Robert Kosturek ◽  
Marcin Wachowski ◽  
Lucjan Śnieżek ◽  
Michał Gloc
Keyword(s):  
Heat Treatment ◽  
Diffusion Zone ◽  
Explosive Welding ◽  
Stress Relief ◽  
Scanning Transmission Electron Microscope ◽  
Post Weld Heat Treatment ◽  
Inconel 625 ◽  
Scanning Transmission ◽  
Inconel 625 Alloy ◽  
Weld Heat

Inconel 625 and steel P355NH were bonded by explosive welding in this study. Explosively welded bimetal clad-plate was subjected to the two separated post-weld heat treatment processes: stress relief annealing (at 620 °C for 90 min) and normalizing (at 910 °C for 30 min). Effect of heat treatments on the microstructure of the joint has been evaluated using light and scanning electron microscopy, EDS analysis techniques, and microhardness tests, respectively. It has been stated that stress relief annealing leads to partial recrystallization of steel P355NH microstructure in the joint zone. At the same time, normalizing caused not only the recrystallization of both materials, but also the formation of a diffusion zone and precipitates in Inconel 625. The precipitates in Inconel 625 have been identified as two types of carbides: chromium-rich M23C6 and molybdenum-rich M6C. It has been reported that diffusion of alloying elements into steel P355NH takes place along grain boundaries with additional formation of voids. Scanning transmission electron microscope observation of the grain microstructure in the diffusion zone shows that this area consists of equiaxed grains (at the side of Inconel 625 alloy) and columnar grains (at the side of steel P355NH).

Sign in / Sign up

Export Citation Format

Share Document