Microstructure and Substructure of Pearlite in Hypoeutectoid Ferritic-Pearlitic Steels

Кантор, М. М.; Воркачев, К. Г.

doi:10.1007/s11041-017-0140-y

Cited by 4 publications

(6 citation statements)

References 16 publications

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“…Solid solution of Nb has a strong dragging effect on interstitial carbon, which inhibits the diffusion of carbon, thus increasing the diffusion activation energy of carbon atoms in under‐cooled austenite. [ 17 ] An increase in the diffusion activation energy lengthens the incubation period of pearlite and decreases the temperature of pearlite transformation. As shown in Figure 10c,d, Alloy 2 has visible Nb‐containing particles with small size at all cooling rates.…”

Section: Discussionmentioning

confidence: 99%

Ultrafine Pearlitic Transformation Behavior of 2000 MPa Ultra‐High‐Strength Steel Wire Under Nb Microalloying

Zhou

et al. 2020

steel research int.

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The influence of Nb in the transformation behavior of ultra‐high‐strength pearlitic steels is studied. The phase transition temperature is measured by thermal simulation device, and the continuous cooling transformation curve is established. Results show that with addition of Nb, the equilibrium transformation temperature of the test steel increases, and both size of the original austenite, pearlite colonies and pearlite lamellar spacing are refined. Pearlitic transformation mechanism has changed by the addition of Nb through the interaction of solid solution and precipitation. Nb microalloy delays the beginning and ending point of pearlite transformation when the cooling rate is greater than 1.00 and 0.10 °C s−1, respectively. In contrast, the transformation point is advanced when the cooling rate is less than 0.50 and 0.05 °C s−1. This variation is mainly due to the morphology and distribution of Nb‐containing precipitates at different cooling rates.

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Section: Discussionmentioning

confidence: 99%

Ultrafine Pearlitic Transformation Behavior of 2000 MPa Ultra‐High‐Strength Steel Wire Under Nb Microalloying

Zhou

et al. 2020

steel research int.

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“…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%

“…Brittle destruction of low-alloy steels, containing ferrite components with BSC lattice, occurs via trans-crystalline cleavage, i.e. quick crack propagation along the definite crystallographic planes (manly along {100} of ferrite) [13,15]. That's why prevention of brittle destruction is the main material science condition to provide workability of low-alloy steel as structural material.…”

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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Hypoeutectoid and Pearlite Ferrite Aggregates in Low-Carbon, Low-Alloy Steel

et al. 2020

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Microstructure and Substructure of Pearlite in Hypoeutectoid Ferritic-Pearlitic Steels

Cited by 4 publications

References 16 publications

Ultrafine Pearlitic Transformation Behavior of 2000 MPa Ultra‐High‐Strength Steel Wire Under Nb Microalloying

Ultrafine Pearlitic Transformation Behavior of 2000 MPa Ultra‐High‐Strength Steel Wire Under Nb Microalloying

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

Hypoeutectoid and Pearlite Ferrite Aggregates in Low-Carbon, Low-Alloy Steel

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