scholarly journals Features of the ferrite-bainite structure low-alloy low-carbon steel after heat hardening and subsequent tempering

2021 ◽  
pp. 33-47
Author(s):  
L.M. Deineko ◽  
A.Yu. Borysenko ◽  
A.О. Taranenko ◽  
T.O. Zaitseva ◽  
N.S. Romanova
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Controlled Rolling ◽  
Alloyed Steel ◽  
Low Alloy Steels ◽  
Low Carbon ◽  
Finished Steel ◽  
Bainite Structure ◽  
Bainitic Structure ◽  
Low Alloyed Steel

Problem statement. In recent decades, there has been a tendency to increase the mechanical properties of low-carbon, low-alloyed steel plate iron by using controlled rolling or hardening heat treatment of finished steel parts. At the same time, for welded parts, the most suitable is a metal having a ferrite-bainite (or bainite) structure. The work investigated the features of the ferrite-bainite structure of low-carbon and low-alloyed steel 15ХСНД for the production of connecting pipeline parts. Purpose of the article. To establish the laws of formation of a ferritic-bainitic structure in low-carbon low-alloy steels depending on the parameters of heat treatment. Determine the effect of heat treatment parameters on the properties of the connecting parts of pipelines made of these steels. Conclusion. The regularities of the influence of heat treatment parameters on the structure, mechanical properties and topography of fractures of impact samples of 15ХСНД steel with a ferrite-bainitic structure are established. Keywords: stamped-welded connecting parts of man pipelines; heat treatment; microstructure; bainite;mechanical properties; fractography

Fast Salt Bath Heat Treatment for a Bainitic/Martensitic Low-Carbon Low-Alloyed Steel

2015 ◽  
Vol 46 (11) ◽  
pp. 5343-5349
Author(s):  
Julia Urbanec ◽  
Ari Saastamoinen ◽  
Seppo Kivivuori ◽  
Seppo Louhenkilpi
Keyword(s):  
Heat Treatment ◽  
Salt Bath ◽  
Alloyed Steel ◽  
Low Carbon ◽  
Low Alloyed Steel

scholarly journals Study of the thermal treatment modes influence on the forming of microstructure and specified complex of mechanical properties of high-strength sheet product with guaranteed level of hardness (400–450 HB) of low-alloyed steel

2019 ◽  
Vol 75 (4) ◽  
pp. 480-487
Author(s):  
M. Yu. Matrosov ◽  
P. G. Martynov ◽  
A. V. Mitrofanov ◽  
K. Yu. Barabash ◽  
T. V. Goroshko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fine Structure ◽  
Thermal Treatment ◽  
Hot Rolling ◽  
High Strength ◽  
Controlled Rolling ◽  
Alloyed Steel ◽  
Accelerated Cooling ◽  
Cold Forming ◽  
Low Alloyed Steel

High-strength sheet product of low-alloyed steel, used at manufacturing of heavy-loaded structures, must have, apart from wear resistance, high toughness, good weldability, ability to hot and cold forming, machinability and low cost. Combination of these properties based on forming fine grain austenite structure before the martensitic transformation at definite its thermal treatment modes. Results of study of microstructure, fine structure and mechanical properties of high-strength boron-containing low-alloyed steel after different technological methods of the rolled product manufacturing presented: high-temperature hot rolling and twostages controlled rolling with accelerated cooling followed by thermal treatment – quenching with tempering. Variants of optimal modes of thermal treatment determined, providing combination of high level of impact toughness under negative temperatures, hardness and strength properties of sheet product. The two considered in the article technological variants, comprising treatment of low-alloyed steel with boron (hot rolling and two-stages controlled rolling with accelerated cooling) followed by thermal treatment results in forming fine structure of tempered martensite, which provides high mechanical properties, meeting the made requirements. Depending on the heating temperature before quenching in the range 770–950 °С, the morphology of the actual steel grain is changing from elongated to equiaxed, which is connected with the metal recrystallization process during heating after plastic deformation. The study results obtained allow to optimize the thermal treatment processes of sheet product of low-alloyed boron containing steel for particular conditions of application.

scholarly journals Study on the Influence of Carbon on Standardized and Non-Standardized Steel

2019 ◽  
Vol 16 (1) ◽  
pp. 14-18
Author(s):  
Liviu Dorin Pop
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Heat Treating ◽  
Alloyed Steel ◽  
Basic Knowledge ◽  
Low Carbon ◽  
Close Link ◽  
High Alloyed Steel

Abstract The way a piece or tool behaves in operation is determined by the quality of the material from which it is made, the precision of execution and heat treatment applied. In the present research, it is highlighted the differences that take shape after heat treating different materials (low carbon steel and high alloyed steel) including heating to dissimilar austenitic phases (880°C and 1020°C), holding for non-identical times, tempering at low temperature (260 °C) and then cooling by using separate cooling mediums (oil, air and water). The results show no noticeable increase in the hardness and mechanical properties for the low carbon steel after the heat treatment, but on the other hand, the high alloyed steel, reveals distinguishable changes in both hardness and mechanical properties. There is a close link between the structure, the parameters of the thermal processes and the properties that are desired so that future specialists have to assimilate the basic knowledge related to the phenomena that occur during a heat treatment but at the same time it is important to equip the companies with machines and measure devices, like a spectrometer.

scholarly journals Effect of cooling rate on the microstructure and mechanical properties of a low-carbon low-alloyed steel

2021 ◽  
Author(s):  
Hongcai Wang ◽  
Lijie Cao ◽  
Yujiao Li ◽  
Mike Schneider ◽  
Eric Detemple ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Plate Thickness ◽  
Microstructural Characterization ◽  
Mechanical Tests ◽  
Alloyed Steel ◽  
Low Carbon ◽  
Cooling Rates ◽  
Heavy Plate ◽  
Low Alloyed Steel

AbstractHeavy plate steels with bainitic microstructures are widely used in industry due to their good combination of strength and toughness. However, obtaining optimal mechanical properties is often challenging due to the complex bainitic microstructures and multiple phase constitutions caused by different cooling rates through the plate thickness. Here, both conventional and advanced microstructural characterization techniques which bridge the meso- and atomic-scales were applied to investigate how microstructure/mechanical property-relationships of a low-carbon low-alloyed steel are affected by phase transformations during continuous cooling. Mechanical tests show that the yield strength increases monotonically when cooling rates increase up to 90 K/s. The present study shows that this is associated with a decrease in the volume fraction of polygonal ferrite (PF) and a refinement of the substructure of degenerated upper bainite (DUB). The fine DUB substructures feature C-rich retained austenite/martensite-austenite (RA/M-A) constitutes which decorate the elongated micrograin boundaries in ferrite. A further increase in strength is observed when needle-shaped cementite precipitates form during water quenching within elongated micrograins. Pure martensite islands on the elongated micrograin boundaries lead to a decreased ductility. The implications for thick section plate processing are discussed based on the findings of the present work.

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 Enhancing mechanical properties of a low-carbon microalloyed cast steel by controlled heat treatment

2013 ◽  
Vol 559 ◽  
pp. 427-435 ◽  
Author(s):  
Jingwei Zhao ◽  
Jeong Hun Lee ◽  
Yong Woo Kim ◽  
Zhengyi Jiang ◽  
Chong Soo Lee
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cast Steel ◽  
Low Carbon ◽  
Carbon Microalloyed
Sign in / Sign up

Export Citation Format

Share Document