Fracture toughness of MAG welds in pulsed current of API 5L AX65M thermomechanical treated steel

2020 ◽  
Vol 62 (3) ◽  
pp. 304-310
Author(s):  
Ion Mitelea ◽  
Dinu Simionescu ◽  
Corneliu Marius Crăciunescu ◽  
Ion Dragoş Uţu
Keyword(s):  
Fracture Toughness ◽  
Pulsed Current ◽  
Treated Steel

TATMO V

Alloy Digest ◽  
1985 ◽  
Vol 34 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
High Speed ◽  
Heat Treating ◽  
Steel Company ◽  
Treated Steel ◽  
Heat Treated ◽  
Red Hardness ◽  
Edge Toughness ◽  
Heat Treated Steel

Abstract TATMO-V is a high-speed tool steel with superior abrasion resistance because of its high contents of carbon and vanadium. It is an excellent choice for premium grade tools which require an outstanding balance of red hardness, edge toughness, and wear resistance. Increased tool life of Tatmo-V is noted in the machining of semi-hard, heat-treated steel pats (300-350 Brinell). This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-434. Producer or source: Latrobe Steel Company.

ARMCO VNT

Alloy Digest ◽  
1971 ◽  
Vol 20 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Strength ◽  
Heat Treating ◽  
Bend Strength ◽  
Low Alloy Steel ◽  
Fine Grain ◽  
Treated Steel ◽  
International Sales ◽  
Minimum Yield

Abstract ARMCO VNT is a high-strength, low-alloy steel normalized for added toughness, ductility and uniformity. It is a silicon-killed, vanadium-nitrogen treated steel, made to fine-grain practive and provides a 60,000 psi minimum yield strength. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SA-260. Producer or source: Armco International Sales.

Simultaneous Synthesis and Consolidation of Nanostructured HfB2–SiC Composite

2021 ◽  
Vol 21 (7) ◽  
pp. 4011-4015
Author(s):  
Seong-Eun Kim ◽  
Jin-Kook Yoon ◽  
In-Jin Shon
Keyword(s):  
Fracture Toughness ◽  
Relative Density ◽  
Combustion Synthesis ◽  
Pulsed Current ◽  
Mechanical Pressure ◽  
Simultaneous Application ◽  
One Step ◽  
Simultaneous Synthesis ◽  
Short Time ◽  
Sintering Method

A dense nanostructured 2HfB2-SiC composite was simultaneously synthesized and consolidated by the pulsed current activated sintering method in one step within very short time (two minutes) from mechanically activated 2Hf, B4C and Si powders. Simultaneous combustion synthesis and consolidation were achieved through the combination of the effects of the pulsed current and mechanical pressure. A highly dense 2HfB2–SiC composite with 97.5% relative density was achieved under the simultaneous application of a pressure of 80 MPa and the pulsed current. The fracture toughness of the 2HfB2–SiC composite was higher than that of monolithic HfB2.

The Influence of Post-Quenching Deep Cryogenic Treatment on Tempering Processes and Properties of D2 Tool Steel. Studies of Structure, XRD, Dilatometry, Hardness and Fracture Toughness

2006 ◽  
Vol 258-260 ◽  
pp. 415-420 ◽  
Author(s):  
Ignacy Wierszyłłowski
Keyword(s):  
Fracture Toughness ◽  
Cryogenic Treatment ◽  
Cryogenic Temperatures ◽  
Deep Cryogenic Treatment ◽  
Treated Steel ◽  
The Matrix ◽  
Xrd Studies ◽  
Number Of Publications ◽  
D2 Steel ◽  
Tetragonal Martensite

A significant increase in durability of cryogenically treated tools after quenching was reported by a number of publications [1, 2]. As research studies show [4, 5, 6, 7], the main reason for this is the kind of carbides precipitated during tempering at temperature range of 150 –200 0C, which is different than in the case of conventional treatment. These carbides are finer and more evenly distributed in the matrix of steel. The number of carbides is higher than in conventionally treated steels because of higher fraction of martensite in cryogenically treated steels produced by retained austenite transformation at cooling to deep cryogenic temperatures. The number of carbides precipitated from martensite at low temperatures of tempering is proportional to shrinkage produced at the same temperatures of tempering. Calculations on the basis of dilatometric experiments show that the shrinkage difference between the same D2 steel cryogenically and conventionally treated is higher than that which results from the increased fraction of martensite in cryogenically treated steel. The XRD studies of cryogenically treated steel show a presence of two kinds of martensites differing in tetragonality. Low temperature tempering of cryogenically treated steel produced two types of carbides – ε carbide and η carbide. The conventionally treated steel consists of one kind of tetragonal martensite and one kind of carbide - the ε carbide. The hardness of cryogenically treated samples was somewhat higher than in conventionally treated ones, while fracture toughness of conventionally treated samples was somewhat higher than in cryogenically treated ones. The results obtained were discussed in reference to literature data.

scholarly journals Synthesis and Sintering of Nanostructured ZrB2-Al2O3 Composite

2021 ◽  
Vol 59 (10) ◽  
pp. 692-697
Author(s):  
In-Jin Shon
Keyword(s):  
Fracture Toughness ◽  
Coefficient Of Thermal Expansion ◽  
Pulsed Current ◽  
Mechanical Pressure ◽  
Simultaneous Application ◽  
Ultra High Temperature Ceramics ◽  
Brittle Ductile Transition ◽  
Al2o3 Composite ◽  
Effective Combination ◽  
One Step

ZrB2 is considered a candidate material for ultra-high temperature ceramics because of its high thermal conductivity, high melting point, and low coefficient of thermal expansion. Despite these attractive properties, ZrB2 applications are limited by its low fracture toughness below the brittle-ductile transition temperature. To improve its ductile properties, the approach universally utilized has been to add a second material to form composites, and to fabricate nanostructured materials. In this study a dense nanostructured ZrB2-Al2O3 composite was rapidly sintered using the pulsed current activated heating (PCAH) method within 3 min in one step, from mechanically synthesized powders of ZrB2 and Al2O3. Consolidation was accomplished using an effective combination of current and mechanical pressure. A highly dense ZrB2- Al2O3 composite with a relative density of up to 97.4% was fabricated using the simultaneous application of 70 MPa pressure and a pulsed current. The fracture toughness and hardness of the ZrB2-Al2O3 composite were 3.9 MPa.m1/2 and 1917 kg/mm2, respectively. The fracture toughness of the composite was higher than that of monolithic ZrB2.

scholarly journals Rapid Sintering and Synthesis of Nanocrystalline Ta-ZrO2 Composite

2020 ◽  
Vol 58 (11) ◽  
pp. 776-781
Author(s):  
Seong-Eun Kim ◽  
In-Jin Shon
Keyword(s):  
Fracture Toughness ◽  
Nanocrystalline Materials ◽  
Uniaxial Pressure ◽  
Pulsed Current ◽  
Mechanical Pressure ◽  
Hardness Tester ◽  
Rapid Sintering ◽  
Nanocrystalline Composite ◽  
Hip Joint Replacements ◽  
Short Time

ZrO<sub>2</sub> is a promising candidate for knee and hip joint replacements due to its excellent combination of low density, corrosion resistance and biocompatibility. Nevertheless, a low fracture toughness of pure ZrO<sub>2</sub> at room temperature limits its wider application in the industry. One of the most obvious ways to solve the problem is to add a reinforcing phase, to produce a nanocrystalline composite material. Nanomaterials have been widely studied in recent years because they can improve hardness and fracture toughness. To produce nanocrystalline materials, the pulsed current activated sintering method has the advantage of simultaneously applying mechanical pressure and pulsed current during sintering. As a result, nanocrystalline materials can be produced within a very short time. Ta and ZrO<sub>2</sub> nanopowders were mechanically synthesized from Ta<sub>2</sub>O<sub>5</sub> and 2.5Zr powders according to the reaction (Ta<sub>2</sub>O<sub>5</sub> + 5/2Zr → 2Ta + 5/2ZrO<sub>2</sub>). The synthesized powders were then sintered using pulsed current activated heating under 80 MPa uniaxial pressure within two minutes. Hardness and fracture toughness were measured using a Vickers hardness tester. The average hardness and fracture toughness of the nanocrystalline 2Ta-5/2ZrO<sub>2</sub> composite sintered at 1350 <sup>o</sup>C were 1008 kg/mm<sup>2</sup> and 10 MPa·m<sup>1/2</sup>, respectively. Both the hardness and fracture toughness of the composite were higher than monolithic ZrO<sub>2</sub>. The microstructure and phase of the composite was also investigated by FE-SEM and XRD.

Mechanical Properties and Consolidation of WC-8wt.%Ni Hard Materials by HFIHS and PCAS

2007 ◽  
Vol 124-126 ◽  
pp. 1153-1156 ◽  
Author(s):  
In Kyoon Jeong ◽  
Hwan Cheol Kim ◽  
Jung Mann Doh ◽  
Jin Kook Yoon ◽  
In Yong Ko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Particle Size ◽  
Grain Size ◽  
High Frequency ◽  
Sintering Behavior ◽  
Pulsed Current ◽  
Hard Materials ◽  
Short Time ◽  
High Frequency Induction

Two methods, High-Frequency Induction-Heated Sintering (HFIHS) and Pulsed Current Activated Sintering (PCAS), were utilized to consolidate WC-8wt.%Ni hard materials. The demonstrated advantages of these processes are rapid densification to near theoretical density in a relatively short time and with insignificant change in grain size. The hardness, fracture toughness, and the relative density of the dense WC–8Ni composites produced by HFIHS and PCAS were investigated. And the effect of variation in particle size of WC powder on the sintering behavior and mechanical properties were investigated.

The Effect of BN Reinforcement on the Mechanical Properties of Nanostructured Al2O3 Ceramics

2020 ◽  
Vol 20 (7) ◽  
pp. 4353-4357 ◽  
Author(s):  
Seong-Eun Kim ◽  
Woo-Jin Cho ◽  
Jin-Kook Yoon ◽  
In-Jin Shon
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Size ◽  
Transition Temperature ◽  
Composite Materials ◽  
Pulsed Current ◽  
Nanostructured Composite ◽  
Reinforcing Agent ◽  
Rapid Sintering ◽  
Sintering Method

In spite of many attractive properties, the low fracture toughness of Al2O3 ceramic below ductilebrittle transition temperature limits its wide application in industry. One of the most obvious methods to improve the fracture toughness has been to add reinforcing compounds to fabricate nanostructured composite materials. In this respect, BN was evaluated as the reinforcing agent of Al2O3 ceramics using pulsed current activated sintering (PCAS). Highly dense alumina-BN composites with a relative density of up to 100% were achieved within short periods (2 min) by PCAS under a 80 MPa pressure. The rapid sintering method allowed the retention of the nanostructure by inhibiting the grain growth. The grain size of alumina was reduced remarkably by the addition of BN. The addition of BN to Al2O3 ceramic simultaneously improved the hardness and fracture toughness of alumina-BN composite.

scholarly journals Fracture Toughness Improvement Mechanism of Calcium Treated Steel

1999 ◽  
Vol 85 (3) ◽  
pp. 261-268
Author(s):  
Hiroshi YOSHIDA ◽  
Hiroshi KATSUMOTO ◽  
Michihiko NAGUMO
Keyword(s):  
Fracture Toughness ◽  
Treated Steel ◽  
Toughness Improvement

Relationships between the Microstructure, Hardness and Fracture Toughness of Differently Sub-Zero Treated Tool Steel

2019 ◽  
Vol 395 ◽  
pp. 95-112 ◽  
Author(s):  
Peter Jurči ◽  
Ivo Dlouhý ◽  
Jakub Horník ◽  
Petra Priknerová ◽  
Zdeněk Mrštný
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Population Density ◽  
Tool Steel ◽  
Retained Austenite ◽  
Room Temperature ◽  
Secondary Hardening ◽  
Temperature Quenching ◽  
Treated Steel ◽  
Different Temperatures

A PM made Cr-V ledeburitic tool steel Vanadis 6 has been subjected to conventional austenitizing and quenching, which was followed by sub-zero treatment at different temperatures, and by tempering treatments. The microstructure, hardness and fracture toughness of sub-zero treated steel have been investigated with reference to the same material after conventional room temperature quenching. The main findings are that sub-zero treatments reduce the retained austenite amount, enhance the population density of small carbides, refine the martensite and change the precipitation of carbides during tempering. These alterations are reflected in elevated hardness after low-temperature tempering but slightly lowered hardness after tempering within the normal secondary hardening temperature range, except the specimens treated at-140 °C where the hardness improvement was maintained. The fracture toughness is rather negatively influence by the sub-zero treatments, except the treatment at-140 °C where no impact or rather improvement has been recorded; thus, the treatment at a temperature of-140 °C seems to be a promising way how to improve the hardness and the fracture toughness pf the Vanadis 6 steel simultaneously.

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