Development of ultra-high strength carbide-free bainitic cast steels

2020 ◽  
Vol 33 (6) ◽  
pp. 258-265
Author(s):  
Nicolás Emanuel Tenaglia ◽  
Alejandro Basso ◽  
Juan Massone ◽  
Roberto Boeri
Keyword(s):  
High Strength ◽  
Cast Steels

scholarly journals Microstructural and Mechanical Characterization of a Nanostructured Bainitic Cast Steel

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 612 ◽  
Author(s):  
Andrés Felipe Santacruz-Londoño ◽  
Oscar Rios-Diez ◽  
José A. Jiménez ◽  
Carlos Garcia-Mateo ◽  
Ricardo Aristizábal-Sierra
Keyword(s):  
Cast Steel ◽  
Isothermal Holding ◽  
High Strength ◽  
Cast Steels ◽  
Final Microstructure ◽  
Potential Applications ◽  
Steel Castings ◽  
Kinetics Of ◽  
Holding Temperature

Nanoscale bainite is a remarkable microstructure that exhibits a very promising combination of high strength with good ductility and toughness. The development of these types of microstructures has been focused on wrought materials, and very little information is available for steel castings. In this work, a specially designed cast steel with 0.76 wt % C was fabricated, and the heat treatment cycles to develop bainitic nanostructures were determined by studying the kinetics of the bainitic transformation using high-resolution dilatometry. The effects of isothermal holding temperature and time on the final microstructure and mechanical properties were thoroughly characterized in order to evaluate a future industrial implementation of the process in an effort to contribute to enhance and widen the potential applications for cast steels.

The Fracture Toughness of Cast High-Strength Steels

1977 ◽  
Vol 99 (1) ◽  
pp. 70-75 ◽  
Author(s):  
S. Floreen
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Stainless Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Sand Cast ◽  
Maraging Steels ◽  
Cast Steels ◽  
Heterogeneous Nature ◽  
Hot Rolled

The mechanical properties of four cast high-strength steels, 4340, 15-5 PII stainless steel, and two maraging steels were examined. To provide a direct comparison with wrought steels split heats were prepared in which part of each heat was sand cast and the balance was forged and hot-rolled to plate. The KIc properties of the castings were comparable to the plate properties. Limited tests indicated that the cast steels also had reasonably good fatigue and stress corrosion cracking resistance. The castings showed surprisingly low Charpy values, which was attributed to notch acuity due to the more heterogeneous nature of the fractures in the cast structures. The overall results suggest that cast high-strength steels had satisfactory toughness and could be used in many applications.

Singularities of the fracture of high-strength cast steels in low-endurance fatigue

1975 ◽  
Vol 7 (6) ◽  
pp. 687-695
Author(s):  
V. V. Rybin ◽  
A. I. Patsiornykh ◽  
Yu. I. Poli�ktov
Keyword(s):  
High Strength ◽  
Cast Steels

Dynamic Fracture Toughness of High Strength Cast Steels

2013 ◽  
Vol 7 (4) ◽  
pp. 17-33 ◽  
Author(s):  
L. Bartlett ◽  
A. Dash ◽  
D. Van Aken ◽  
V. Richards ◽  
K. Peaslee
Keyword(s):  
Fracture Toughness ◽  
Dynamic Fracture ◽  
High Strength ◽  
Dynamic Fracture Toughness ◽  
Cast Steels

New Corrosion-Resistant Bactericidal Nitrogen-Containing Steels with Increased Strength

2010 ◽  
Vol 76 ◽  
pp. 72-77
Author(s):  
Lyudmila M. Kaputkina ◽  
Vera Prokoshkina ◽  
A.G. Svyazhin
Keyword(s):  
Nickel Content ◽  
Cold Deformation ◽  
High Strength ◽  
Sample Surface ◽  
Dendritic Segregation ◽  
Corrosion Resistant ◽  
Cast Steels ◽  
Increased Strength ◽  
Micro Organisms ◽  
Natural Composite

The new high-strength stainless steels alloyed by copper and nitrogen and possessing high resistance to corrosion by active micro-organisms in carbon-oxidizing, heterotrophic and sulfate-regenerating bacteria mediums are developed. The introducing of small addition of nitrogen (about 0.22 %) to the corrosion resistant steel С0.5Cr15Ni5Cu2NMoNbTi results in a decrease of adhesive micro-organisms quantity on a sample surface by 8 times, while increasing of nickel content to 9 % results in their decrease only by 2 times. It is supposed that the effect of nitrogen can be related to formation of biocide substances. High copper (Cu = 2.5-5 %) nitrogen-containing cast steels are in austenitic (non-magnetic) condition. Due to a dendritic segregation, the structure of steel corresponds to a natural composite structure, and it is preserved on heating to high temperatures. After cold deformation with up to 85 % reduction, the steels preserve austenitic structure, and its hardness attains a level close to the hardness level of the martensitic structure. The developed corrosion-resistant antimicrobial steels with the increased hardness can be used as a material for the surgical instrument.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

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