Study of the critical deformation dependence for dynamic recrystallization in low-carbon steels on the chemical composition

2020 ◽  
pp. 74-79
Author(s):  
V.N. Gadalov ◽  
V.V. Shkatov ◽  
Yu. V. Skripkina ◽  
A.E. Gvozdev
Keyword(s):  
Chemical Composition ◽  
Dynamic Recrystallization ◽  
Chemical Elements ◽  
Carbon Steels ◽  
Low Alloy Steels ◽  
Low Carbon ◽  
Automated Control ◽  
Critical Deformation ◽  
Alloy Steels ◽  
Improved Model

The article considers dependence of the critical deformation for dynamic recrystallization in low-alloy steels on the chemical composition. The article shows an improved model for forecasting the critical deformation for dynamic recrystallization, which allows considering the content of chemical elements in steel. The article analyzes the influence of the chemical composition of low-alloy steels on the value of critical deformation during hot deformation. The article shows that the developed mathematical model can be used in the system of automated control of the structure and properties of steels during hot rolling to forecast conditions for the development of dynamic recrystallization and to select the optimal chemical composition of steels.

scholarly journals Study on Spheroidization and Related Heat Treatments of Medium Carbon Alloy Steels

2018 ◽  
Vol 144 ◽  
pp. 02008 ◽  
Author(s):  
S. R. Harisha ◽  
Sathyashankara Sharma ◽  
U. Achutha Kini ◽  
M. C. Gowri Shankar
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Manganese Content ◽  
Heat Treatments ◽  
Carbon Steels ◽  
Low Alloy Steels ◽  
Low Carbon ◽  
Medium Carbon ◽  
Medium Carbon Steels ◽  
Alloy Steels

The importance of medium carbon steels as engineering materials is reflected by the fact that out of the vast majority of engineering grade ferrous alloys available and used in the market today, a large proportion of them are from the family of medium carbon steels. Typically medium carbon steels have a carbon range of 0.25 to 0.65% by weight, and a manganese content ranging from 0.060 to 1.65% by weight. Medium carbon steels are more resistive to cutting, welding and forming as compared to low carbon steels. From the last two decades a number of research scholars reported the use of verity of heat treatments to tailor the properties of medium carbon steels. Spheroidizing is the novel industrial heat treatment employed to improve formability and machinability of medium/high carbon low alloy steels. This exclusive study covers procedure, the effects and possible outcomes of various heat treatments on medium carbon steels. In the present work, other related heat treatments like annealing and special treatments for property alterations which serve as pretreatments for spheroidizing are also reviewed. Medium carbon steels with property alterations by various heat treatment processes are finding increased responsiveness in transportation, aerospace, space, underwater along with other variegated fields. Improved tribological and mechanical properties consisting of impact resistance, stiffness, abrasion and strength are the main reasons for the increased attention of these steels in various industries. In the present scenario for the consolidation of important aspects of various heat treatments and effects on mechanical properties of medium carbons steel, a review of different research papers has been attempted. This review may be used as a guide to provide practical data for heat treatment industry, especially as a tool to enhance workability and tool life.

scholarly journals IMPROVEMENT OF THE TECHNOLOGICAL PROCESS OF MELTING CARBON AND LOW-ALLOY STEELS IN ELECTRIC ARC FURNACES WITH ACID LINING

2021 ◽  
pp. 62-65
Author(s):  
Yu. V. Grebnev ◽  
N. I. Gabelchenko ◽  
V. F. Zharkova ◽  
D. Yu. Grebnev
Keyword(s):  
Melting Process ◽  
Medium Carbon Steel ◽  
Electric Arc ◽  
Carbon Steels ◽  
Smelting Process ◽  
Low Alloy Steels ◽  
Carbon Oxidation ◽  
Low Carbon ◽  
Medium Carbon ◽  
Alloy Steels

In the production of castings from medium-carbon steel grades, metal carburization with pig iron additives, as well as carbon oxidation processes require additional consumption of auxiliary materials and electricity and take from 20 to 30% of the total technological time for the steel smelting process. an electric arc furnace with an acidic lining. In the work, studies were carried out on the combination of the processes of carbon oxidation of low-carbon steels and carburization for medium-carbon steels with the process of melting the charge in order to reduce the time of the melting process and reduce the number of labor-intensive operations.

UNIFLUX VCM 125

Alloy Digest ◽  
1978 ◽  
Vol 27 (1) ◽  
Keyword(s):  
Carbon Dioxide ◽  
Fracture Toughness ◽  
Weld Metal ◽  
Heat Treating ◽  
Carbon Steels ◽  
Low Alloy Steels ◽  
Electrode Wire ◽  
Molybdenum Steel ◽  
Alloy Steels ◽  
Welding Electrode

Abstract UNIFLUX VCM 125 is a continuous flux-cored welding electrode (wire) that is used to deposit 1 1/4% chromium-1/2% molybdenum steel for which it was developed. Welding is protected by a shielding atmosphere of 100% carbon dioxide. This electrode also may be used to weld other low-alloy steels and carbon steels; however, the weld metal may differ somewhat from 1 1/4% chromium-1/2% molybdenum because of weld-metal dilution. When Uniflux VCM 125 is used to weld 1 1/4% chromium-1/2% molybdenum steel, it provides 95,000 psi tensile strength at 70 F and 24 foot-pounds Charpy V-notch impact at 40 F. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as heat treating, machining, and joining. Filing Code: SA-340. Producer or source: Unicore Inc., United Nuclear Corporation.

UNIFLUX V90

Alloy Digest ◽  
1979 ◽  
Vol 28 (2) ◽  
Keyword(s):  
Carbon Dioxide ◽  
High Strength ◽  
Heat Treating ◽  
Carbon Steels ◽  
Low Alloy Steels ◽  
Nickel Steel ◽  
Steel Weld Metal ◽  
Alloy Steels ◽  
Temperature Impact ◽  
Welding Electrode

Abstract UNIFLUX V90 is a continuous flux-cored welding electrode (wire) developed to weld high-strength low-alloy steels, but it may be used to weld other low-alloy steels and carbon steels. It is used to deposit typically 2.40% nickel steel weld metal with good low-temperature impact properties. Welding is protected by a shielding atmosphere of either 75% argon-25% carbon dioxide or 100% carbon dioxide. Uniflux V90 is used widely in shipbuilding and other fabricating industries. It provides around 88,000 psi tensile strength and around 26 food-pounds Charpy V-notch impact at 60 F. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as heat treating, machining, and joining. Filing Code: SA-355. Producer or source: Unicore Inc., United Nuclear Corporation.

Study on Mean Stress Effects for Design Fatigue Curves

2016 ◽  
Author(s):  
Seiji Asada ◽  
Takeshi Ogawa ◽  
Makoto Higuchi ◽  
Hiroshi Kanasaki ◽  
Yasukazu Takada
Keyword(s):  
Evaluation Method ◽  
Austenitic Stainless Steels ◽  
Fatigue Curve ◽  
Carbon Steels ◽  
Low Alloy Steels ◽  
Mean Stress ◽  
Research Committee ◽  
Stress Effects ◽  
Alloy Steels ◽  
Design Factors

In order to develop new design fatigue curves for austenitic stainless steels, carbon steels and low alloy steels and a new design fatigue evaluation method that are rational and have a clear design basis, the Design Fatigue Curve (DFC) subcommittee was established in the Atomic Energy Research Committee in the Japan Welding Engineering Society. Mean stress effects for design fatigue curves are to be considered in the development of design fatigue curves. The Modified Goodman approach for mean stress effects is used in the design fatigue curves of the ASME B&PV Code. Tentative design fatigue curves were developed and studies on the effect of mean stress and design factors are on-going. Development of design fatigue curves, effect of mean stress and design factors is needed to establish a new fatigue design evaluation method. The DFC subcommittee has studied correction approaches for mean stress effects and the approaches of modified Goodman, Gerber, Peterson and Smith-Watson-Topper were compared using test data in literature. An appropriate approach for mean stress effects are discussed in this paper.

Recent Aspects on the Effect of Inclusion Characteristics on the Intragranular Ferrite Formation in Low Alloy Steels: A Review

2017 ◽  
Vol 36 (4) ◽  
pp. 309-325 ◽  
Author(s):  
Wangzhong Mu ◽  
Pär Göran Jönsson ◽  
Keiji Nakajima
Keyword(s):  
Heat Affected Zone ◽  
Low Alloy Steels ◽  
Low Carbon ◽  
Intragranular Ferrite ◽  
Metallic Inclusions ◽  
Theoretical Investigations ◽  
Alloy Steels ◽  
Institute Of Technology ◽  
Future Work

AbstractIntragranular ferrite (IGF), which nucleates from specific inclusion surfaces in low alloy steels, is the desired microstructure to improve mechanical properties of steel such as the toughness. This microstructure is especially important in the coarse grain heat affected zone (CGHAZ) of weldments. The latest review paper focusing on the role of non-metallic inclusions in the IGF formation in steels has been reported by Sarma et al. in 2009 (ISIJ int., 49(2009), 1063–1074). In recent years, large amount of papers have been presented to investigate different issues of this topic. This paper mainly highlights the frontiers of experimental and theoretical investigations on the effects of inclusion characteristics, such as the composition, size distribution and number density, on the IGF formation in low carbon low-alloyed steels, undertaken by the group of Applied Process Metallurgy, KTH Royal Institute of Technology. Related results reported in previous studies are also introduced. Also, plausible future work regarding various items of IGF formation is mentioned in each section. This work aims to give a better control of improving the steel quality during casting and in the heat affected zone (HAZ) of weldment, according to the concept of oxide metallurgy.

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