Strength and durability of VT1-0 and Fe–18Cr–14Ni powder alloys in high-temperature hydrogen

2012 ◽  
Vol 48 (3) ◽  
pp. 338-344
Author(s):  
A. D. Ivasyshyn ◽  
V. Ya. Podhurs’ka
Keyword(s):  
High Temperature ◽  
Powder Alloys ◽  
Strength And Durability

scholarly journals POTENTIALITIES IN ADDITIVE-SUBTRACTIVE-STRENGTHENING TECHNIQUES

2016 ◽  
Vol 2016 (4) ◽  
pp. 151-160 ◽  
Author(s):  
Олег Федонин ◽  
Oleg Fedonin ◽  
Д. Соловьёв ◽  
D. Solovev ◽  
Светлана Федонина ◽  
...  
Keyword(s):  
Shock Wave ◽  
Comparative Analysis ◽  
High Temperature ◽  
Temperature Influence ◽  
Compressive Stresses ◽  
Thermal Origin ◽  
Billet Material ◽  
Product Manufacturing ◽  
Strength And Durability ◽  
Arc Deposition

The accurate shape obtaining is the most significant, but far from being the only problem which is solved at parts produc-tion. Not less important are also such properties as elasticity, plasticity, strength and durability and so on. It is well-known that high-temperature influence upon billet material which follows any of known processes of additive processing ad-versely affects the above-mentioned properties. The most significant task of additive techniques is ensuring material qua-litative structure and high operating properties in a part manufactured at multiple increase of productivity. The purpose of theoretical and practical researches carried out consists in the development of the technology in which to the processes of additive and subtractive treatment there is added a process of hardening with shock wave deformation that allows structuring, strengthening, compacting the material of a layer grown forming compressive stresses instead of tensile residual stresses of thermal origin. The growth of a part is carried out by means of arc deposition with wire materi-al. Such an approach ensures productivity by an order higher, but has such drawbacks as defects of structure, considerable porosity and low accuracy in comparison with powder additive techniques. The drawbacks mentioned are compensated by strengthening and machining in the course of product manufacturing. The research methods - a comparative analysis of the structure of iron-carbon material manufactured with the use of additive-subtractive techniques and additive-subtractive strengthening techniques. Results and conclusions. In strengthened material, in contrast to non-strengthened one there are no practically hidden cavities. The dimensions of phase elements of ferrite and pearlite in material manufactured according to the technology with strengthening decrease by more than five times. Hardness of material grown with strengthening exceeds more than twice hardness of material manufactured without strengthening.

scholarly journals Reducing the strength and durability loss of high performance ready mix and roller compacted concrete due to early age high temperature curing

2021 ◽  
Author(s):  
Richard Sluce
Keyword(s):  
High Temperature ◽  
High Performance ◽  
High Performance Concrete ◽  
Strength Loss ◽  
Early Age ◽  
Roller Compacted Concrete ◽  
Supplementary Cementing Materials ◽  
Chemical Admixtures ◽  
Strength And Durability ◽  
Ready Mix Concrete

This thesis reports the findings of a study conducted on the effects of mixing and curing high performance concrete at elevated temperature. The purpose of the study was to find solutions to ameliorate the strength and durability loss resulting from high temperature environments. This investigation is broken down into two distinct phases. Phase I consisted of a preliminary mortar investigation followed by Phase IIa which was conducted on ready mix concrete and Phase IIb which studied roller compacted concrete. Phase IIa investigated the ability of supplementary cementing materials and chemical admixtures to mitigate the deleterious effects of curing at high temperature. In contrast, Phase IIb investigated the ability of supplementary cementing materials to reduce the deleterious effects. It was found that supplementary cementing materials were moderately effective at ameliorating strength loss, and performed well in reducing durability loss. The chemical admixtures only performed well in ameliorating strength loss.

High-temperature radiation embrittlement of magnesium-beryllium powder alloys

1990 ◽  
Vol 29 (9) ◽  
pp. 725-727
Author(s):  
V. F. Zelenskii ◽  
I. M. Neklyudov ◽  
L. S. Ozhigov ◽  
V. I. Savchenko
Keyword(s):  
High Temperature ◽  
Radiation Embrittlement ◽  
Powder Alloys ◽  
Beryllium Powder ◽  
Temperature Radiation

Research and Evaluation of High Temperature Plugging Agent

2013 ◽  
Vol 750-752 ◽  
pp. 1685-1688
Author(s):  
Peng Fei Shen ◽  
Yong Sheng Chen ◽  
Ling Li ◽  
Yin Ni ◽  
Na Zhao ◽  
...  
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
High Temperature ◽  
Ultrafine Particles ◽  
High Performance ◽  
Setting Time ◽  
Initial Setting Time ◽  
Grouting Material ◽  
Initial Setting ◽  
Strength And Durability

Superfine cement is an ideal grouting material of high-performance ultrafine particles. It has excellent permeability, higher strength and durability. One of the most important features of superfine cement is no pollution on environment. SHD and SCC are two kinds of cement which have different performance. Comparing particle size, initial setting time, compressive strength and plug rate of two kinds of superfine cement by experiment. The result of experiment shows that cement SCC has higher compressive strength and plug rate at higher temperatures.

NEONICKEL L605/25

Alloy Digest ◽  
2021 ◽  
Vol 70 (10) ◽  
Keyword(s):  
Solid Solution ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Aerospace Industry ◽  
Heat Treating ◽  
High Temperature Strength ◽  
Cobalt Chromium ◽  
Good Oxidation Resistance ◽  
Surgical Implants ◽  
Strength And Durability

Abstract NeoNickel L605/25 is a solid-solution strengthened cobalt-chromium-tungsten-nickel alloy that combines excellent high temperature strength with good oxidation resistance up to 980 °C (1800 °F). It is most commonly used in the aerospace industry due to its strength and durability in high temperature environments. It is also used for the manufacture of surgical implants. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Co-141. Producer or source: NeoNickel.

scholarly journals Strength and Durability Performance of Slag Blended Cements in High Temperature Environments

2017 ◽  
Vol 1 (2) ◽  
pp. 265-272 ◽  
Author(s):  
O. R. Ogirigbo ◽  
I. Inerhunwa
Keyword(s):  
High Temperature ◽  
Portland Cement ◽  
Chloride Ion ◽  
Chemical Compositions ◽  
Ion Permeability ◽  
Replacement Ratio ◽  
Blended Cements ◽  
Strength And Durability ◽  
Durability Performance ◽  
Better Than

In this study, two slags of different chemical compositions were blended with a CEM I 52.5R-type Portland cement at 30% wt. replacement ratio. Various tests such as strength, water and chloride ion permeability test were carried out at a high temperature of 38°C. The performances of the slag blends were measured against that of a CEM I 42.5R-type Portland cement. The results obtained showed that the performances of the slag blends were better than that of the CEM I 42.5R cement. In comparing the performances of the slags, the blend prepared from slag 1 had higher strengths and better transport properties than that prepared from slag 2, and this was attributed to the higher basicity and alumina content of slag 1. The findings of the study suggest that in tropical/ high temperature environments, the chemical composition of the slags play an important role in determining their performance.

scholarly journals Reducing the strength and durability loss of high performance ready mix and roller compacted concrete due to early age high temperature curing

2021 ◽  
Author(s):  
Richard Sluce
Keyword(s):  
High Temperature ◽  
High Performance ◽  
High Performance Concrete ◽  
Strength Loss ◽  
Early Age ◽  
Roller Compacted Concrete ◽  
Supplementary Cementing Materials ◽  
Chemical Admixtures ◽  
Strength And Durability ◽  
Ready Mix Concrete

This thesis reports the findings of a study conducted on the effects of mixing and curing high performance concrete at elevated temperature. The purpose of the study was to find solutions to ameliorate the strength and durability loss resulting from high temperature environments. This investigation is broken down into two distinct phases. Phase I consisted of a preliminary mortar investigation followed by Phase IIa which was conducted on ready mix concrete and Phase IIb which studied roller compacted concrete. Phase IIa investigated the ability of supplementary cementing materials and chemical admixtures to mitigate the deleterious effects of curing at high temperature. In contrast, Phase IIb investigated the ability of supplementary cementing materials to reduce the deleterious effects. It was found that supplementary cementing materials were moderately effective at ameliorating strength loss, and performed well in reducing durability loss. The chemical admixtures only performed well in ameliorating strength loss.

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