Optimizing the chemical composition of an AMg6-type alloy using a fracture toughness characteristic

1981 ◽  
Vol 13 (4) ◽  
pp. 468-472
Author(s):  
M. I. Saenko ◽  
S. Z. Stasyuk ◽  
N. N. Fortunatova ◽  
V. Ya. Korzhova
Keyword(s):  
Fracture Toughness ◽  
Chemical Composition ◽  
Type Alloy ◽  
Toughness Characteristic ◽  
Fracture Toughness Characteristic

Research on the Mechanical Behavior of High Strength Concrete

2011 ◽  
Vol 243-249 ◽  
pp. 1047-1052
Author(s):  
Shu Guang Luan ◽  
Rui Jin Zhang ◽  
Hao Wang
Keyword(s):  
Fracture Toughness ◽  
Mechanical Behavior ◽  
High Strength Concrete ◽  
Characteristic Length ◽  
High Strength ◽  
Experimental Investigations ◽  
Good Uniformity ◽  
Structural Entity ◽  
Toughness Characteristic ◽  
Fracture Toughness Characteristic

Bases on experimental investigations of HSC and NSC, HSC’s mechanical behavior, failure mechanism, fracture toughness, characteristic length and damage feature are discussed in the paper, and the formula for flexural strength and comparative toughness is given. The results show that the HSC has a good uniformity of structural entity and large cracking resistance. In addition, HSC is more brittle and more vulnerable to damage than NSC.

Evaluation of Fracture Toughness Characteristic for Nuclear Piping Using Various Types of Specimens

2010 ◽  
Author(s):  
Soo Park ◽  
Sang-soo Yoo ◽  
Jun-ki Min ◽  
Jae-Mean Koo ◽  
Chang-Sung Seok
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Fracture Resistance ◽  
Resistance Curve ◽  
Constraint Effect ◽  
Standard Specimens ◽  
The Difference ◽  
Leak Before Break ◽  
Toughness Characteristic ◽  
Fracture Toughness Characteristic

The leak-before-break (LBB) concept is based on the fracture resistance curve obtained by J-R tests on various types of specimens. But it has been also known that the fracture toughness data by various types of specimens are different each other. For example, the estimates for fracture toughness of standard specimens are conservative when compared to the fracture toughness of real pipes owing to the difference of the constraint effect between real pipes and standard specimens. Therefore for estimating the integrity of real pipes on the basis of elastic-plastic fracture mechanics, we have to first establish the relations among real pipes, standard CT specimens and curved CT specimens. In this study, we performed the fracture toughness tests for nuclear piping material by various types of specimen. And each J-R curve considered in the constraint effect was compared.

Fracture Toughness of Large Forgings for Power Producing Industry

2013 ◽  
Vol 577-578 ◽  
pp. 593-596 ◽  
Author(s):  
Václav Mentl
Keyword(s):  
Fracture Toughness ◽  
Chemical Composition ◽  
Steam Turbine ◽  
Mechanical Treatment ◽  
Material Degradation ◽  
The Real ◽  
Operational Safety ◽  
Local Properties ◽  
Thermo Mechanical Treatment ◽  
Shape And Size

The steam turbine rotors represent large components both in radial and axial directions. Their local properties generally differ from one forging to another, or if we compare head and bottom parts of the original ingot, or central and circumferential localities of one rotor body respectively, or if we compare the properties of separate discs e.g. in the case of welded rotors. These differences stem from both even slight changes in the chemical composition (of separate heats or even within one ingot) and thermo-mechanical treatment and in the differences in technology with respect to the real shape and size of the forgings in question. In the paper, the consequences of the differences in fracture toughness characteristics in various rotor localities are discussed with respect to the rotors operational safety taking into account the existence of cracks and material degradation.

scholarly journals Electroless Ni-P Coatings: Preparation and Evaluation of Fracture Toughness and Scratch Hardness

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Wagner Sade ◽  
Reinaldo Trindade Proença ◽  
Thiago Daniel de Oliveira Moura ◽  
José Roberto Tavares Branco
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Chemical Composition ◽  
Scratch Hardness ◽  
Hard Particles ◽  
Steel Aisi ◽  
Electroless Ni ◽  
Preparation And Evaluation ◽  
Phase Relationships ◽  
Thermally Treated

Ni-P chemical coatings have been used to prevent wear, corrosion and as an alternative for hard chromium, since the latter's deposition processing is very harmful to the human health and the environment. In the present paper, Ni-P coatings with 8 and 10% P were deposited in steel AISI 1020 and thermally treated. Ni-1wt%P coatings with incorporation of hard particles of Al2O3 were also investigated. The microstructure and phase relationships were analyzed and correlated with the fracture toughness and scratch hardness of the coatings.The results show that the fracture toughness of the coating was smaller when thermally treated at 400°C for 1 hour and the scratch hardness reached a peak in this temperature. The relation of chemical composition and microstructure with mechanical properties of Ni-P coatings is presented. The phosphorus contents, the crystallization, and the incorporation of hard particles in the coatings change the values of toughness fracture and scratch hardness.

Fracture Toughness of Highly Irradiated Pressure Vessel Steels in the Upper Shelf Temperature

2006 ◽  
Author(s):  
Hiroshi Matsuzawa ◽  
Toru Osaki
Keyword(s):  
Fracture Toughness ◽  
Chemical Composition ◽  
Reference Material ◽  
Fast Neutron ◽  
Pressure Vessel ◽  
Charpy Impact ◽  
Pressure Vessels ◽  
Shelf Energy ◽  
Pressure Vessel Steels ◽  
Reactor Pressure

Nine Reactor Pressure Vessel (RPV) Steels and four RPV weld were irradiated up to 1.2 × 1024n/m2 fast neutron fluence (E>1MeV), and their fracture toughness and Charpy impact energy were measured. As chemical compositions, such as Cu, are known to affect the fracture toughness reduction due to neutron exposure, the above steels were fabricated by changing chemical composition widely to cover the chemical composition of the RPV materials of the operating Japanese nuclear power plants. 2.7 mm thick compact specimens were used to measure the upper shelf fracture toughness of highly irradiated materials, and their Charpy upper shelf energy was also measured. By correlating Charpy upper shelf energy to fracture toughness, the upper shelf fracture toughness evaluation formulae for highly irradiated reactor pressure vessel steels were developed. Both compact and V-notched Charpy impact specimens were irradiated in a test reactor. The fast neutron flux above 1MeV was about 5 × 1016n/(m2s). Charpy impact specimens made of Japanese PWR reference material containing 0.09w% Cu were irradiated simultaneously. The upper shelf energy of the reference material up to the medium fluence level showed little difference in the reduction of upper shelf energy to that which had been in the operating plant and which was irradiated to the same fluence. The developed correlation formulae have been adopted in the Japan Electric Association Code as new formulae to predict the fracture toughness in the upper shelf region of reactor pressure vessels. They will be applied to time limited ageing analysis of low upper shelf reactor pressure vessels in Japan, on a concrete technical basis in very high fluence regions.

Prediction of Fracture Toughness of Steels According to the Microstructure and Chemical Composition

2020 ◽  
Vol 989 ◽  
pp. 353-358
Author(s):  
Yulia Bakhracheva
Keyword(s):  
Fracture Toughness ◽  
Chemical Composition ◽  
Crack Resistance ◽  
Single Parameter ◽  
Microstructure Parameters

The influence of microstructure parameters and chemical composition on the fracture toughness of steel is investigated. It is shown that the crack resistance of steel can not be reliably estimated only by a single parameter of the microstructure or only by chemical composition. A generalized parameter of microstructure and chemical composition, which correlates well with crack resistance, is proposed.

Mechanical Properties of α- and β-SiAlON Composite Ceramics Using β-SiAlON Powder

2008 ◽  
Vol 403 ◽  
pp. 111-114 ◽  
Author(s):  
Kei Asakoshi ◽  
Junichi Tatami ◽  
Katsutoshi Komeya ◽  
Takeshi Meguro ◽  
Masahiro Yokouchi
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Rare Earth ◽  
Chemical Composition ◽  
Metal Oxides ◽  
Bending Strength ◽  
Rare Earth Oxide ◽  
Composite Ceramics ◽  
Oxide Powders ◽  
Sialon Powder

β-SiAlON powder was used as a raw powder to fabricate α/β-SiAlON composite ceramics with different rare earth elements. The phases present in the sample fabricated from -SiAlON, α-Si3N4, AlN, and rare earth oxide powders were - and -SiAlONs. The composition was dependent on the chemical composition and firing profile. The sample obtained by adding Yb2O3 had a high -SiAlON content. The /-SiAlON composite ceramics had high densit. Their microstructures depended on the used metal oxides, namely, the addition of Nd2O3 and CaCO3 resulted in the elongation of the -SiAlON grains. The bending strength, fracture toughness, and hardness were influenced by the -SiAlON content, amount of elongated grains, and density of the sample.

BÖHLER WKV

Alloy Digest ◽  
1955 ◽  
Vol 4 (12) ◽  
Keyword(s):  
Thermal Conductivity ◽  
Fracture Toughness ◽  
High Temperature ◽  
High Efficiency ◽  
Heat Treating ◽  
Type Alloy ◽  
Hot Strength ◽  
Temperature Performance ◽  
Heat Checking ◽  
Resistance To Heat

Abstract Böhler (or Boehler) WKV is a high efficiency hot-work steel having high resistance to heat checking, high tempering stability, adequate hot strength, sufficient toughness at working temperatures and very good thermal conductivity. It approaches ASM IIID or SAE Type S1 or AISI S1 in composition and type alloy. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-41. Producer or source: Böhler Uddeholm N.A..

NSSMC-NAR-AH-4

Alloy Digest ◽  
2016 ◽  
Vol 65 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
High Temperature ◽  
Chemical Composition ◽  
Austenitic Stainless Steel ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Temperature Performance

Abstract NSSMC-NAR-AH-4 is an austenitic stainless steel with excellent oxidation resistance. The chemical composition can be identified as 23Cr-11Ni-N-REM-B. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness and creep. It also includes information on high temperature performance as well as forming. Filing Code: SS-1241. Producer or source: Nippon Steel and Sumitomo Metal Corporation.

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