EBSD Investigation of Continuously Cooled Microstructures in Low Carbon Low Alloy Ferrite-Pearlite Steel

Кантор, М. М.; Воркачев, К. Г.

doi:10.1166/sam.2017.2838

Cited by 3 publications

(5 citation statements)

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“…In the present work, we refer to these microstructures as polygonal ferrite (PF, featureless gray regions), degenerated pearlite (DP, arrow highlighted bright region) and degenerated upper bainite (DUB, ellipse highlighted regions with fine substructure). The designations polygonal ferrite, degenerated pearlite and degenerated upper bainite and their abbreviations PF, DP and DUB are used as proposed by Zajac et al [19] and have been frequently adapted by many researchers such as [11,[31][32][33][34]. Figures 3a and b show that the PF and DP volume fractions decrease as b increases from 0.5 K/s to 1 K/s.…”

Section: Microstructural Features Observed By Semmentioning

confidence: 99%

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

Wang

Cao

et al. 2021

J Mater Sci

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Heavy 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.

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Section: Microstructural Features Observed By Semmentioning

confidence: 99%

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

Wang

Cao

et al. 2021

J Mater Sci

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show abstract

“…Relation between microstructure and impact strength for metals of multi-pass seam is very complicated, because different factors can have positive and negative effect depending on studying material and its microstructural state [21][22][23]. In addition to microstructural components, influence of secondary heating, presence of micro-phases and inclusions [13][14][15][16][17] are recognized as critical factors, having the effect on microstructure and, respectively, on impact strength.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

“…Impact strength (KCU) of the metal formed via additive technology was determined during the tests for impact bending of the samples with U-shaped concentrator according to the GOST9454-78 and GOST 6impact bending of the samples with U-shaped concentrator according to the GOST9454-78 and GOST 6996-66. The testing for impact bending was conducted on standard nominally identical samples 10x10x55 mm with U-shaped notch for strengthening of sensitivity relating to the local microstructural features of impact strength within the range T-B transition [13][14][15]. The samples were cut from the middle part of the built-up wall in direction of built-up movement and in perpendicular direction in the vertical plane (Fig.…”

Section: Materials and Methods Of The Studymentioning

confidence: 99%

“…At the same time the authors [12][13][14][15] noted, that existence of tough-brittle (T-B) transition on the toughness temperature relationship is a fundamental feature of low-alloy steels. It is stipulated by the fact that microstructure of such steels contains mainly ferrite components (with BSC (body centered cubic) lattice.…”

Section: Introductionmentioning

confidence: 99%

“…However, just before manufacture of reliable components, operating in the conditions of critical loads, via WAAM method [12][13][14][15][16][17][18][19][20] will become the main direction, more deep understanding of mechanical properties of the obtained materials for built-up of such type is required. This work is devoted to study of metal impact strength properties for low-alloy C-Mn-Si composition, which was formed in the process of wire-arc additive manufacturing.…”

Section: Introductionmentioning

confidence: 99%

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Study of impact strength of C-Mn-Si composition metal after wire-arc additive manufacturing (WAAM)

Balanovskiy¹,

Astafyeva²,

Kondratyev³

et al. 2022

cisisr

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The results of study of impact strength of C-Mn-Si composition metal after wire-arc additive manufacturing (WAAM) are presented. It was established that destruction of the samples of such composition at the temperatures below tough-brittle transition occurs both via tough and brittle mechanisms. The samples manufactured in the direction along built-up welding are characterized by essentially lower impact strength comparing with those manufactured in vertical direction of samples cutting. Impact strength of the samples made of 09G2SA standard steel is substantially lower than for C-Mn-Si composition metal which was obtained via additive technology. Fractographic analysis of fractures for C-Mn-Si compositions manufactured via additive technology using carbon dioxide and gas mixture displays tough pit destruction type. The samples with high impact strength are characterized by forming of cleavage facets after tough crack propagation to the sample middle, what is accompanied by significant widening opposite to a notch and narrowing under a notch. The samples with low impact strength are characterized by forming of brittle fracture directly under a notch without essential sample plastic deformation. It is shown that built-up welding with partial or complete recrystallization of rolls is required for forming of cold-resistant metal structure. In this case, order of rolls location, heat input and parameters of welding conditions make the direct effect on shape, geometrical dimensions, fusion penetration and number of rolls, as well as on size and morphology of the structural components, percent relation between cast and recrystallized microstructure of seam metal. The complex of these factors finally determines structural state and cold resistance of seam metal.

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Microstructure and Substructure of Pearlite in Hypoeutectoid Ferritic-Pearlitic Steels

Кантор

Воркачев

2017

Met Sci Heat Treat

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EBSD Investigation of Continuously Cooled Microstructures in Low Carbon Low Alloy Ferrite-Pearlite Steel

Cited by 3 publications

References 0 publications

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

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

Study of impact strength of C-Mn-Si composition metal after wire-arc additive manufacturing (WAAM)

Microstructure and Substructure of Pearlite in Hypoeutectoid Ferritic-Pearlitic Steels

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