scholarly journals Untempered Ultra-high Strength Steels of High Fracture Toughness

1972 ◽  
Vol 236 (68) ◽  
pp. 108-109 ◽  
Author(s):  
V. F. ZACKAY ◽  
E. R. PARKER ◽  
R. D. GOOLSBY ◽  
W. E. WOOD
Keyword(s):  
Fracture Toughness ◽  
High Strength Steels ◽  
High Strength ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Ultra High Strength Steels

FERRIUM M54

Alloy Digest ◽  
2018 ◽  
Vol 67 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Resistance ◽  
High Strength ◽  
Cost Effective ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Structural Applications ◽  
Resistance To Stress

Abstract Ferrium M54 was designed to create a cost-effective, ultra high-strength, high-fracture toughness material with a high resistance to stress-corrosion cracking for use in structural applications. This datasheet provides information on composition, hardness, and tensile properties as well asfatigue. Filing Code: SA-822. Producer or source: QuesTek Innovations, LLC.

Preparation and Characterization of Reaction Sintering B4C/SiC Composite Ceramic

2014 ◽  
Vol 602-603 ◽  
pp. 536-539
Author(s):  
Hai Bin Sun ◽  
Yu Jun Zhang ◽  
Qi Song Li
Keyword(s):  
Fracture Toughness ◽  
High Performance ◽  
Bending Strength ◽  
Carbon Sources ◽  
High Hardness ◽  
High Strength ◽  
Composite Ceramic ◽  
High Fracture Toughness ◽  
Reaction Sintering ◽  
High Fracture

High hardness, high strength, high fracture toughness and low density are required for novel bulletproof materials. B4C/SiC composite ceramic is one of the most potential candidates. In this study, B4C/SiC composite ceramic was prepared by reaction sintering. The influence of B4C content, species and content of carbon, sintering temperature on the mechanical properties of B4C/SiC composite ceramic were studied. A high performance B4C/SiC composite ceramic was sintered at 1750°C for 30 min. Phenolic resin and carbon black were both chosen as carbon sources, whose favorable contents were 10wt%, 5wt%, respectively. The density of sintered bodies reduces with B4C content increases. To some extent, fracture toughness, bending strength improve initially and then deteriorate with the increase of B4C content whose optimal amount is 30wt%. The optimal fracture toughness and bending strength of the B4C/SiC composite ceramic are 5.07MPa·m1/2 and 487MPa, respectively. Meanwhile, the Viker-hardness of the sintered body is 30.2GPa, the density is as low as 2.82g/cm3.

Correlation between microstructure and mechanical properties in silicon carbide with alumina addition

1993 ◽  
Vol 8 (7) ◽  
pp. 1635-1643 ◽  
Author(s):  
S.S. Shinozaki ◽  
J. Hangas ◽  
K.R. Carduner ◽  
M.J. Rokosz ◽  
K. Suzuki ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Silicon Carbide ◽  
Analytical Electron Microscopy ◽  
High Strength ◽  
High Fracture Toughness ◽  
Sintered Body ◽  
High Fracture ◽  
High Fatigue ◽  
Alumina Addition

The microstructure of pressureless sintered silicon carbide (SiC) materials with alumina (Al2O3) addition was investigated using analytical electron microscopy and nuclear magnetic resonance. A sintered body with a density of higher than 99% theoretical was obtained with an addition of 5 wt.% Al2O3. The sintered body (SiC–Al2O3) has high strength, high fracture toughness, and high fatigue resistance. Its fracture toughness is approximately 5 MPa-m1/2, which is twice as high as that of pressureless sintered SiC materials with boron and carbon additions (SiC–B–C). The correlation between the microstructure and the mechanical properties is presented here. The starting β–SiC powder is mostly transformed to α–SiC with various polytype distributions during the sintering process. The microstructure has homogeneously distributed, fine, plate-like interlocking gains with a high aspect ratio. Well-developed basal planes form parallel and elongated boundaries, and the crystal structure is mostly the 6H polytype (56%) mixed with thin lamellar 4H.

Characterization of Tempered 4340 Steel after 1200°C Austenitization

1980 ◽  
Vol 38 ◽  
pp. 380-381
Author(s):  
K. P. Datta ◽  
V. C. Kannan
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Yield Strength ◽  
High Strength Steels ◽  
High Strength ◽  
Subsequent Tempering ◽  
Considerable Research ◽  
4340 Steel ◽  
Ultra High Strength Steels

Considerable research is in progress to improve the fracture toughness of low alloy ultra-high strength steels such as 4340 while maintaining the same level of yield strength. One such methodis high temperature austenitization (1200° C). Subsequent tempering, in general, renders still higher toughness and hence this study is aimed at characterization of tempered 4340 steel after 1200° C austenitization.

LESCALLOY AF1410 VIM-VAR

Alloy Digest ◽  
2010 ◽  
Vol 59 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
High Strength ◽  
Heat Treating ◽  
High Fracture Toughness ◽  
Steel Company ◽  
High Fracture ◽  
Strength Alloy ◽  
Specialty Steel ◽  
Very High

Abstract Lescalloy AF1410 VIM-VAR is a clean high strength alloy steel with high strength and a very high fracture toughness. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: SA-618. Producer or source: Latrobe Specialty Steel Company.

Sulfide Stability, Void Nucleation and the Toughness of Ultra High Strength Steels

1990 ◽  
Vol 186 ◽  
Author(s):  
W. M. Garrison ◽  
J. L. Maloney
Keyword(s):  
Fracture Toughness ◽  
Volume Fraction ◽  
Void Nucleation ◽  
High Strength Steels ◽  
High Strength ◽  
Calcium Sulfide ◽  
Chromium Sulfide ◽  
Ultra High Strength Steels ◽  
Inclusion Volume ◽  
Inclusion Volume Fraction

The upper shelf fracture toughness of ultra high strength steels is dependent on both the microstructure, which is determined by composition and heat treatment, and on the inclusions present in the steel. The inclusions In ultra high strength steels are typically oxides and sulfides [1]. In most ultra high strength steels the sulfides are manganese sulfides, although depending on the composition of the steel and the melt practice used, other sulfides are found, such as chromium sulfide, calcium sulfide and lanthanum oxy-sulfide [2]. If the inclusions can be regarded as pre-existing voids then the inclusion volume fraction and spacing appear to be sufficient to characterize the inclusion population from the standpoint of fracture toughness [3,4]. The purpose of this paper is to discuss results which show sulfur can be gettered as particles which are much more resistant to void nucleation than manganese sulfides and that this increased resistance to void nucleation can result in vastly improved upper shelf fracture toughness. In particular, when HY180 steel contains manganese sulfides the fracture toughness is about 250 MPa but when the sulfur is gettered as particles containing titanium, carbon and sulfur the fracture toughness of HY180 steel will approach 550 MPa . These particles, believed to be titanium carbosulfides, are much more resistant to void nucleation than manganese sulfides and this increased resistance to void nucleation appears to be the reason for the improved fracture toughness.

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