Detection of interphase precipitation in microalloyed steels by microhardness measurements

Campos, Sandro Xavier de; Morales, Eduardo Valencia; Kestenbach, H.‐J.

doi:10.1016/j.matchar.2004.06.012

Cited by 24 publications

(11 citation statements)

References 4 publications

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“…Grain size of the two kind particles were equal, coinciding with the conclusion of the Ref. [7]. This leads to derivation of a more considerable question that interphase precipitation grains precipitated at higher temperature followsγ→α phase transformation but general precipitation is the oversaturated precipitation of ferrite.…”

Section: Identification Of Interphase Precipitation and General Precisupporting

confidence: 75%

“…So grains in Fig.7(b) are interphase precipitation even though they look like general precipitation. It should be emphasized that the description of interphase and general precipitation in former documents [2,7] should be carefully examine and distinguish. .8 Step growth model for interphase precipitation Fig.7 Microstructure of C test steel in table 1 with 50% deformation at 760 ℃ b) The size of precipitated particles had osculating relations with its form.…”

Section: Identification Of Interphase Precipitation and General Precimentioning

confidence: 99%

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Precipitation and hetero-nucleation effect of V(C, N) in V-microalloyed steel

Zhao

Wang

et al. 2008

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The precipitation behavior of V(C, N) in steels microalloyed with vanadium was researched using a thermal simulator during single-pass deformation at 800-750 ℃. The V(C, N) precipitates and its nucleation effect on ferrite were investigated by TEM and EDS. The experimental results show that there are two remarkable heterogeneous nucleation effects of V(C, N) particles precipitated before γ→αphase change: primary reason is that high coherency between V(C, N) and ferrite promotes V(C, N) to become a nucleating center of intragranular ferrite; secondary reason is that the coarsening of V(C, N) causes locally solute-poor region in austenite, thus expedites the nucleation of intragranular ferrites further. Furthermore, the relationship between the size and shape of V(C, N) was studied, and identification method was provided for distinguishing interphase precipitation and general precipitation to avoid erroneous judgment and misguide.

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Section: Identification Of Interphase Precipitation and General Precisupporting

confidence: 75%

Section: Identification Of Interphase Precipitation and General Precimentioning

confidence: 99%

Precipitation and hetero-nucleation effect of V(C, N) in V-microalloyed steel

Zhao

Wang

et al. 2008

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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“…Generally, the micro‐hardness fluctuated with different grains in the same specimen, for example, the micro‐hardness of some ferrite reached 271 HV compared with low value 226 HV in the same specimen. Because of the micro‐hardness can be associated with carbide precipitation in the ferrite grain for Ti‐bearing low carbon steels, so the precipitation process is not uniform in ferrite grains. The average micro‐hardness was calculated, as shown in Figure , and the short holding time at 650°C resulted in high micro‐hardness than those measured in other specimens.…”

Section: Results and Dicussionmentioning

confidence: 99%

Investigation of Precipitate in Polygonal Ferrite in a Ti-Microalloyed Steel Using TEM and APT

Long

Liu

et al. 2014

steel research int.

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Transmission electron micrograph and atom probe tomography were used to characterize the distribution, sizes, and compositions of precipitates in a Ti microalloyed steel. At 650 and 7008C with holding time 600 and 1800 s, respectively, the dispersion precipitates were obtained in all specimens, and the interphase precipitates were only observed at short holding time, but this interphase precipitation was unstable at long holding time. The kinetics of precipitates in ferrite depended on both coiling temperature and holding time. A lot of small precipitates were obtained at 650 8C with holding time 600 s, and these nanoprecipitates can strengthen the ferrite matrix largely. The average Guinier radius of nanoprecipitate was about 4.3 nm, and the large precipitates (Guinier radius $7-9 nm) with small precipitates (Guinier radius $3-5 nm) within an interphase sheet were also observed due to the growth of some precipitates at the cost of small precipitates. The nano-precipitates were mainly titanium carbide, and the atomic ratio of Ti/C was about 0.55, and this value was changed regularly in one precipitate.[ Ã ] Prof.

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“…O aço microligado apresentou grãos ferríticos com maior dureza, sendo em média 21 Vickers superior ao aço carbono comum (Figura 5), mesmo exibindo menor teor de carbono e manganês (elementos endurecedores da ferrita). Segundo Campos et al [12], a precipitação de finos carbonitretos de nióbio ocorrem durante a transformação da austenita para ferrita na laminação a quente de aços microligados, contribuindo significativamente para o aumento da resistência do grão ferrítico.…”

Section: Figura 2 Microestrutura Do Aço (A) Microligado E (B) Aço Caunclassified

Efeito Da Adição De Microligas Na Laminação De Bobinas a Quente

David¹,

Oliveira²,

Faria³

et al. 2017

Anais Do Seminário De Laminação E Conformação

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ResumoA laminação de tiras a quente de bobinas de aço apresenta alta relevância devido a possibilidade de obtenção de diversos produtos para diferentes aplicações, tais como: construção civil, industria automotiva e implementos agrícolas. O controle das variáveis de processo, tais como temperatura de reaquecimento de placa, velocidade de resfriamento e temperatura de bobinamento, é determinante para obtenção da microestrutura e, por conseguinte, das propriedades mecânicas do material. O propósito desse trabalho é estudar o comportamento da microestrutura e das propriedades mecânicas com a variação da composição química (adição de microligas de nióbio e titânio), mantendo uma rota de laminação termomecânica similar na laminação de bobinas a quente. Os aços aplicados neste estudo foram o aço microligado ao nióbio e titânio equivalente ao ASTM A1018 HSLAS 50 Classe 1 e o aço carbono comum equivalente ao ASTM A1018 SS36 Tipo 2. Apesar do aço carbono comum apresentar carbono equivalente superior ao aço microligado, foi verificado maior limite de escoamento (σe) no aço microligado ao nióbio e titânio. Dessa forma, aplicando tratamento termomecânico adequado no aço microligado é possível conseguir propriedades mecânicas melhoradas principalmente devido ao refino de grão e ao endurecimento da ferrita. Palavras-chave: Laminação a quente; Tratamento termomecânico; Aço microligado; Steckel. EFFECT OF ADDING MICROALLOYS IN HOT-ROLLED COILS AbstractThe Hot-Rolled Coils from have a high relevance due to the possibility of obtaining various products for different applications, such as: structural steels, automotive industry and agricultural implements. The control of process variables, such as reheating temperature of the plate, cooling rate and coiling temperature is essential to obtain the microstructures and therefore the mechanical properties of the material. The purpose of this work is to study the behavior of the microstructure and mechanical properties by varying the chemical composition (adding the microalloys of Niobium and Titanium) and the similar thermomechanical rolling route in HotRolled Coils. The steels used in this study were the Niobium and Titanium microalloyed steels equivalent to ASTM A1018 HSLAS 50 Class 1 and carbon steel equivalent to ASTM A1018 SS36 Type 2. Despite the carbon steel has a high amount of carbon them the microalloyed steel, we observed higher Yield Strength in the microalloyed steel with Niobium and Titanium. Thus, applying the appropriate thermomechanical treatment in the microalloyed steel, is possible to improve the mechanical properties mainly due to grain refining and hardening of ferrite.

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Detection of interphase precipitation in microalloyed steels by microhardness measurements

Cited by 24 publications

References 4 publications

Precipitation and hetero-nucleation effect of V(C, N) in V-microalloyed steel

Precipitation and hetero-nucleation effect of V(C, N) in V-microalloyed steel

Investigation of Precipitate in Polygonal Ferrite in a Ti-Microalloyed Steel Using TEM and APT

Efeito Da Adição De Microligas Na Laminação De Bobinas a Quente

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