Influence of V–N Microalloying on the High-Temperature Mechanical Behavior and Net Crack Defect of High Strength Weathering Steel

2016 ◽  
Vol 35 (6) ◽  
pp. 575-582 ◽  
Author(s):  
Jiasheng Qing ◽  
Lei Wang ◽  
Kun Dou ◽  
Bao Wang ◽  
Qing Liu
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Mechanical Behavior ◽  
High Strength ◽  
Weathering Steel ◽  
Similar Reduction ◽  
Ductility Trough ◽  
Thermomechanical Simulation ◽  
The Difference ◽  
Crack Defect

AbstractThe influence of V–N microalloying on the high-temperature mechanical behavior of high strength weathering steel is discussed through thermomechanical simulation experiment. The difference of tensile strength caused by variation of [%V][%N] appears after proeutectoid phase change, and the higher level of [%V][%N] is, the stronger the tensile strength tends to be. The ductility trough apparently becomes deeper and wider with the increase of [%V][%N]. When the level of [%V][%N] reaches to 1.7 × 10−3, high strength weathering steel shows almost similar reduction of area to 0.03% Nb-containing steel in the temperature range of 800–900℃, however, the ductility trough at the low-temperature stage is wider than that of Nb-containing steel. Moreover, the net crack defect of bloom is optimized through the stable control of N content in low range under the precondition of high strength weathering steel with sufficient strength.

ATI 6-2-4-2

Alloy Digest ◽  
2020 ◽  
Vol 69 (8) ◽  
Keyword(s):  
Tensile Strength ◽  
Titanium Alloy ◽  
High Temperature ◽  
Creep Strength ◽  
High Strength ◽  
Heat Treating ◽  
Good Combination ◽  
Long Term Stability ◽  
Temperature Performance

Abstract ATI 6-2-4-2 is a near-alpha, high strength, titanium alloy that exhibits a good combination of tensile strength, creep strength, toughness, and long-term stability at temperatures up to 425 °C (800 °F). Silicon up to 0.1% frequently is added to improve the creep resistance of the alloy. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ti-169. Producer or Source: ATI.

Characterization of Mg-Al Sheet Clad Materials Fabricated by Hot Rolling

2007 ◽  
Vol 26-28 ◽  
pp. 409-412 ◽  
Author(s):  
Jae Seol Lee ◽  
Hyeon Taek Son ◽  
Ki Yong Lee ◽  
Soon Sub Park ◽  
Dae Guen Kim ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Vickers Hardness ◽  
Hot Rolling ◽  
High Strength ◽  
Interface Layer ◽  
Rolling Temperature ◽  
Al Alloy ◽  
Clad Sheet ◽  
The Difference ◽  
Interface Layers

AZ31 Mg / 5083 Al clad sheet was fabricated by the hot rolling method and its mechanical properties were investigated in this study. The tensile strength and yield strength of Mg- Al clad samples were slightly higher than that of AZ31 Mg sample, resulting in high strength 5083 Al alloy. Also, in the case of the AZ31 Mg sample, tensile strength indicated different values to the rolling directions. The thickness of interface layers between magnesium and aluminum materials increased with increasing rolling temperature. The thickness of interface layer was about 1.2 μm and 1.6 μm, respectively. The difference of thickness on the interface layer with variation of rolling temperature was attributed to promote the diffusion between magnesium and aluminum materials. The Vickers hardness of Mg-Al interface layer was around 125 Hv. The interface layer composed of hard inter-metallic phases which may act a increment of Vickers hardness depending upon its thickness.

VASCOJET M-A (CVM)

Alloy Digest ◽  
1963 ◽  
Vol 12 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
High Temperature ◽  
High Strength ◽  
Heat Treating ◽  
Steel Company ◽  
Vanadium Alloys ◽  
Temperature Performance ◽  
Strength Alloy

Abstract Vascojet M-A (CVM) is an ultra high-strength alloy steel capable of reaching tensile strength values up to 360,000 psi and maintaining high strength levels at operating temperatures to 1000 deg. F. It combines extremely high strength with ductility, toughness, fatigue and heat resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SA-150. Producer or source: Vanadium-Alloys Steel Company.

Advanced concretes for high temperature applications

2019 ◽  
Author(s):  
Alok A. Deshpande ◽  
Dhanendra Kumar ◽  
Ravi Ranade ◽  
Andrew S. Whittaker
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Strain Hardening ◽  
Modulus Of Rupture ◽  
Direct Tension ◽  
Conventional Concrete ◽  
Normal Strength ◽  
Temperature Applications

<p>The mechanical properties of concrete deteriorate at high temperatures. Strain-hardening cementitious composites (SHCC) are a special class of fiber-reinforced concretes that exhibit strain-hardening behavior in direct tension. The mechanical behavior of a SHCC made using polyvinyl alcohol (PVA) fibers is characterized after exposure to temperatures up to 800°C. The effects of temperature on compressive strength, splitting tensile strength and modulus of rupture are reported. For comparison, a normal strength conventional concrete of similar compressive strength to the SHCC was heated and tested in the same conditions as the SHCC. The normalized tensile strength of SHCC at room temperature, and after exposure to high temperature, is significantly greater than the value for conventional concrete. The PVA fibers provide crack-bridging capacity up to about 200°C (melting point of PVA fibers is 230°C), leading to improved tensile behavior. At greater temperatures, the fibers melt, creating pathways for steam to escape, reducing micro-cracking and significantly improving mechanical behavior with respect to conventional concrete. SHCC is a robust alternative to conventional concrete for high temperature applications.</p>

Design of New Weathering Steels through Thermodynamic Model of Nitrogen Solubility and CALPHAD

2018 ◽  
Vol 913 ◽  
pp. 620-626 ◽  
Author(s):  
Jian Cheng ◽  
Yue Hua Guo ◽  
Ming Liu ◽  
Hou Fa Shen
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Thermodynamic Model ◽  
Nitrogen Solubility ◽  
High Strength ◽  
Tensile Tests ◽  
Weathering Steel ◽  
Calphad Approach ◽  
N Content ◽  
Hot Rolled

In this paper, a new vanadium nitrogen (V-N) microalloyed high strength weathering steel with the yield strength and tensile strength higher than 550 MPa and 650 MPa was designed and developed by using thermodynamic model of nitrogen solubility and phase diagram database of CALPHAD. Based on the established thermodynamic model, the effect of C content on nitrogen solubility in molten steel was investigated. The nitrogen solubility increases with the decrease of C content and the increase of temperature. In order to obtain higher N content in steel, C content must be controlled at a low range of 0.03~0.04%. Furthermore, an allowable concentration range of C and N was selected based on the phases quantity prediction of VN/V(C,N), (Cr, Fe)7C3, AlN and γ through the CALPHAD approach. Consequently, five new weathering steels were designed with variations of (C+N) content or N/C ratio. And then the four selected steels were cast, hot rolled and air cooled. The tensile tests at the room temperature show that the yield strength and tensile strength of steel with 0.032% C and 0.038%N satisfy the requirements of new generational weathering steel.

scholarly journals Effects of Solution Treatment on Laser Welding of Ti–6Al–4V Alloy Plate Produced through Wire Arc Additive Manufacturing

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1310
Author(s):  
Mingfang Xu ◽  
Yuhua Chen ◽  
Timing Zhang ◽  
Huaibo Deng ◽  
Di Ji
Keyword(s):  
Tensile Strength ◽  
Additive Manufacturing ◽  
Laser Beam Welding ◽  
Solution Treatment ◽  
High Strength ◽  
Travel Speed ◽  
Alloy Plate ◽  
Weave Structure ◽  
The Difference ◽  
Wire Arc Additive Manufacturing

Laser beam welding (LBW) had been successfully applied to the welding of Ti–6Al–4V plates by wire arc additive manufacturing. The effects of solution treatment on microstructure, tensile properties, and microhardness after LBW in different deposition directions were studied. When the wire speeding was 3 m/min and travel speed was 0.36 m/min, the difference in mechanical properties was related to the anisotropy of the microstructure. The long columnar grain along the building direction could provide an α path with a large aspect ratio and high elongation. More grain boundaries are present along the scanning direction than in others, showing high strength. The microstructure of the as-deposited condition mainly consists of coarse prior-β grains, partial basket-weave structure, and numerous martensite α′ phase. In LBW without solution treatment, the microstructure of the welds mainly consists of a large amount of martensite α′ and a small amount of basket-weave structure. The weld had high strength and hardness. The tensile strength was between 930 and 970 MPa. The hardness was between 415 and 456 HV. The elongation ranged from 5% to 7%. Afterwards, the temperature was maintained at 870 °C for 2 h, cooled to 600 °C in the furnace for 1 h, and finally air cooled to room temperature. The martensite α′ was almost completely transformed into platelet α. The microstructure of the welds mainly consists of partial β grains, thimbleful martensite α′, and a large of α path. The strength and hardness of the welds were reduced. The tensile strength is between 910 and 950 MPa. The hardness was between 398 and 445 HV. However, the elongation was significantly improved, and the elongation ranged from 10% to 12%.

High Temperature Elastomers for Extreme Aerospace Environments

1966 ◽  
Vol 39 (4) ◽  
pp. 1141-1160 ◽  
Author(s):  
J. K. Sieron
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Carbon Black ◽  
High Strength ◽  
Magnesium Silicate ◽  
Engineering Properties ◽  
Elastomeric Materials ◽  
And Performance ◽  
High Temperature Tensile ◽  
High Structure

Abstract To meet the ever increasing environmental requirements imposed on sub-system components of advanced aerospace weapons systems, a comprehensive project to develop high strength, high temperature resistant elastomeric materials has been pursued. To attain this goal, research on reinforcement, stabilization, and crosslinking systems for butyl, ethylene propylene terpolymer, and fluoroelastomers was carried out. Results obtained in earlier work with the hydrocarbon elastomers disclosed that fine-particle-size, high-structure carbon black provided excellent tensile properties at high temperatures. Further work on stabilization systems resulted in the discovery that stannous oxide was effective for phenolic-resin-cured butyl at temperatures up to 500° F. For EPT, vulcanization-stabilization systems which provided a threefold improvement in useful life of this elastomer at temperatures in the range 300° F to 500° F were elucidated. Preliminary studies on fluoroelastomer reinforcement led to the finding that properly dispersed carbon fiber imparted not only better high temperature tensile strength, but also improved life at temperatures up to 600° F. In the present work, fibrous magnesium silicate, a material which normally would be used for dusting uncured rubber or as a paint filler, was found to be an effective reinforcing material for fluoroelastomers. Vulcanizates prepared with an acicular-platy form of this material have tensile strength at 400° F which is 80% greater than that with commonly used medium thermal carbon black. Hot tear strengths with even greater improvements were also realized, and as an added bonus, resistance to deterioration over a temperature range of 600° F to 700° F was also noteworthy. Primary implication of this work lies in renewed awareness that elastomeric vulcanizates are composite materials. Reinforcing materials as well as other additives are very influential in determining the engineering properties and performance of elastomers.

MATRIX I

Alloy Digest ◽  
1990 ◽  
Vol 39 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Heat Resistance ◽  
Physical Properties ◽  
High Strength ◽  
Heat Treating ◽  
Temperature Performance ◽  
Strength Alloy

Abstract MATRIX I is an ultra high-strength alloy steel capable of reaching tensile strength values up to 360,000 psi and maintaining high strength levels at operating temperatures to 1000 deg F. It combines extremely high strength with ductility, toughness, fatigue and heat resistance. The alloy was formerly designated VASCOJET M-A(CVM); see Alloy Digest SA-150, July 1963. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SA-449. Producer or source: Teledyne Vasco.

VASCOMAX T-250

Alloy Digest ◽  
1982 ◽  
Vol 31 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
High Temperature ◽  
High Strength ◽  
Heat Treating ◽  
Pressure Vessels ◽  
Temperature Performance ◽  
Ultra High Strength Steel ◽  
Standard Grade

Abstract VascoMax T-250 is an ultra-high-strength steel that delivers the high strength (250 ksi tensile strength) and toughness of VascoMax 250 (Alloy Digest SA-142, March 1963). Yet VascoMax T-250 contains no cobalt and less molybdenum (both strategic elements) than the standard grade. In addition, the new grade provides higher ductility and toughness. VascoMax T-250 is recommended for aerospace structures, pressure vessels, shafting, bolts, and fasteners. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SA-387. Producer or source: Teledyne Vasco.

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