Mechanical properties of carbide-free lower bainite in complex-alloyed constructional steel: Effect of bainitizing treatment parameters

Zurnadzhy, V. І.; Ефременко, В. Г.; Petryshynets, Ivan; Shimizu, Kazumichi; Брыков, М. Н.; Kushchenko, I. V.; Kudin, V. V.

doi:10.4149/km_2020_2_129

Cited by 27 publications

(11 citation statements)

References 35 publications

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“…This microstructure is significantly more ductile than that without isothermal holding (see Figure 2 b) [ 28 ] and has abrasive wear resistance as high as untempered martensite after quenching from 800 °C [ 29 ]. Thus, a combination of quite high abrasive wear resistance (like untempered martensite) and significantly higher ductility of lower bainite [ 36 , 37 , 38 ] makes this microstructure the most favorable for application in abrasive wear conditions.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

et al. 2020

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The purpose of the research was to obtain an arc welded joint of a preliminary quenched high-carbon wear resistant steel without losing the structure that is previously obtained by heat treatment. 120Mn3Si2 steel was chosen for experiments due to its good resistance to mechanical wear. The fast cooling of welding joints in water was carried out right after welding. The major conclusion is that the soft austenitic layer appears in the vicinity of the fusion line as a result of the fast cooling of the welding joint. The microstructure of the heat affected zone of quenched 120Mn3Si2 steel after welding with rapid cooling in water consists of several subzones. The first one is a purely austenitic subzone, followed by austenite + martensite microstructure, and finally, an almost fully martensitic subzone. The rest of the heat affected zone is tempered material that is heated during welding below A1 critical temperature. ISO 4136 tensile tests were carried out for the welded joints of 120Mn3Si2 steel and 09Mn2Si low carbon steel (ASTM A516, DIN13Mn6 equivalent) after welding with fast cooling in water. The tests showed that welded joints are stronger than the quenched 120Mn3Si2 steel itself. The results of work can be used in industries where the severe mechanical wear of machine parts is a challenge.

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Section: Resultsmentioning

confidence: 99%

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

et al. 2020

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“…However, fRA can be increased in the course of bainite transformation which follows after intercritical annealing. Bainite transformation implies the rejection of carbon from bainitic ferrite into austenite causing the carbon enrichment of the latter [37]. Under silicon control the carbon is accumulated in austenite thus its concentration may reach high value, up to 1.1 wt%, as shown in [38] for 0.11 wt%C-1.5wt%Si-1.53wt%Mn steel.…”

Section: Resultsmentioning

confidence: 99%

Element partitioning in low-carbon Si2Mn2CrMoVNb TRIP-assisted steel in intercritical temperature range

Ефременко

Kussa

Petryshynets

et al. 2020

Acta Metall Slovaca

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The present paper is aimed at the study of the kinetics of Mn, Si, Cr partitioning in 0.2wt%C-Si2Mn2CrMoVNb TRIP-assisted steel under the annealing at 770 oC and 830 oC to be within the intercritical temperature range. The work was fulfilled using SEM, EDX, dilatometry, and hardness measurements. It was found that under heating a redistribution of the alloying elements between ferrite and austenite took place. Specifically, silicon partitioned to ferrite while chromium diffused to austenite with distribution coefficient values of 1.12-1.21 (KSi) and 0.75-0.86 (KCr). Manganese was found to partition to a much greater extent resulting in a distribution coefficient of KMn=0.38-0.50 and 2.6 times higher concentration in austenite as compared to ferrite. As annealing temperature raised from 770 oC to 830 oC the elemental partitioning was accelerated, followed by the decrease in manganese content in austenite (by 1.44 time) and ferrite (by 1.34 time) caused by an increase in austenite volume fraction. Silicon featured uneven distribution within ferrite to be accumulated at the “martensite/ferrite” interface and near ferrite grain boundaries, while manganese was concentrated in MC carbides. The recommendation for annealing holding was formulated based on elemental partitioning kinetics.

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“…The multiphase state of TRIP-assisted steels can be acquired by using different approaches. The main ones are bainitizing processing [18,19] and Q&Ptreatment [20,21]. Bainitizing aims at "austenite → bainite" transformation to get the microstructure of low bainite or carbide-free nanostructured bainite (which is essentially the nanosized ferritic laths and film-like retained austenite) [22,23].…”

Section: Introductionmentioning

confidence: 99%

Comparative study on the effect of (Cr, Mo, V)-alloying on transformation and mechanical behavior of 0.2 wt.% C TRIP-assisted steel

Kussa¹,

Zurnadzhy²,

Dabalà³

et al. 2022

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The structure and mechanical properties of two 0.2 wt.% C TRIP-assisted steels (Transformation Induced Plasticity) were compared to evaluate the effect of additional (Cr, Mo, V)-alloying on transformation kinetic and tensile/impact behavior after isothermal bainite transformation (bainitizing) and Q&P (Quenching-and-Partitioning) treatment. The work was performed using SEM, XRD, tensile/impact testing, and computer simulation. It was found that adding 0.55 wt.% Cr, 0.2 wt.% Mo, and 0.11 wt.% V into Mn-Si-Nb steel increased the incubation time in pearlite and bainite temperature ranges by 5.6 and 4.4 times, respectively. More heavily alloyed steel performed an improved combination "Strength/Ductility/Impact Toughness": its maximum PSE (Product of Strength and Elongation) value of 24 GPa• % referred to bainitizing treatment, whereas the highest KCV 20 • C values (220-225 J cm −2 ) corresponded to Q&P treatment. Improved mechanical properties of (Cr, Mo, V)-alloyed steel were attributed to a higher amount of retained austenite and a slower rate of TRIP-effect.

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Mechanical properties of carbide-free lower bainite in complex-alloyed constructional steel: Effect of bainitizing treatment parameters

Cited by 27 publications

References 35 publications

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

Element partitioning in low-carbon Si2Mn2CrMoVNb TRIP-assisted steel in intercritical temperature range

Comparative study on the effect of (Cr, Mo, V)-alloying on transformation and mechanical behavior of 0.2 wt.% C TRIP-assisted steel

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