Effects of deformation and boron on microstructure and continuous cooling transformation in low carbon HSLA steels

Jun, Hyun Jo; Kang, Jee-Hyun; Seo, Dong Han; Kang, Ki-Weon; Park, C.G.

doi:10.1016/j.msea.2005.05.008

Cited by 124 publications

(43 citation statements)

References 8 publications

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“…All this promotes the carbon enrichment of the remaining austenite during dual phase finishing rolling and significantly influences the final microstructure of as-received material. The cooling rate affects the product from the remaining austenite transformation and its volumetric fraction [7][8][9][10][11] . However, the stability of austenite phase stems from significant differences in grain volume and carbon content from grain to grain 12 .…”

Section: Formation Of Microphases and Constituents From Remaining Ausmentioning

confidence: 99%

“…It is well known that the local carbon enrichment can play an important role in the transformation temperature 4,[10][11][12][13][14][15][16][17][18][19][20][21][22]26 , for example, the reduction of the carbon content in the remaining austenite increases Ms temperature. Also, the high cooling rates displace the Ar 3 temperature of steel, decreasing its value and favoring the partial or total transformation of bainite and martensite.…”

Section: Formation Of Microphases and Constituents From Remaining Ausmentioning

confidence: 99%

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Formation of Microphases and Constituents from Remaining Austenite Decomposition in API X80 Steel Under Different Processing Conditions

et al. 2015

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The main goal this work is to evaluate the occurrence of the constituents and microphases observed in as-received API X80 pipe through the microstructures transformed from rich-carbon remaining austenite obtained via heat treatments. These heat treatments comprised austenitization at 1000 °C for 30 minutes, followed by annealing at 700 °C, 623 °C, 542 °C and 462 °C for 15, 60 and 300 minutes and then cooling in water or still air. The effects of the increase in annealing parameters were: 1) the increase of microhardness values of the MA constituents and martensite islands, 2) the grain size of both ferritic phase and the martensite islands were increased, 3) the rise in the mean free path of ferrite and 4) the microstrains of samples were decreased. The cooling rates influenced significantly the transformation of carbon-rich remaining austenite to hard constituents and several microphases. After annealing at 700 °C during 60 min followed by quenching, the morphology of the MA constituents and its microhardness values were compatible for both heat-treated and as-received conditions.

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Section: Formation Of Microphases and Constituents From Remaining Ausmentioning

confidence: 99%

Section: Formation Of Microphases and Constituents From Remaining Ausmentioning

confidence: 99%

Formation of Microphases and Constituents from Remaining Austenite Decomposition in API X80 Steel Under Different Processing Conditions

et al. 2015

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“…The dissolved manganese, while giving solution strengthening, will not increase DBTT . This is the reason why high-strength low-alloy steels have 1-2 % manganese to increase the hardenability (Jun et al 2006). However, in NS2 and NS3 steels, the manganese is added to such a high level of the order of 4 %, so the solution strengthening contribution should not be neglected.…”

Section: Tensile Properties and Effects Of Chemicalmentioning

confidence: 99%

9-12Cr Heat-Resistant Steels

Yan

Wang

Shan³

et al. 2015

Engineering Materials

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“…1 However, with the development of the technology and deterioration of the environment, an even better performance of advanced steel was required, especially for the automotive industry. 2 As a result, DP steels were developed.…”

Section: Introductionmentioning

confidence: 99%

Phase-transformation behavior and micromechanical properties of a dual-phase steel after chemical modifications

Zhao¹,

Zhao²,

Sun³

et al. 2017

Mater. Tehnol.

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In this work, the phase-transformation behavior and micromechanical properties of a dual-phase steel after chemical modifications were investigated theoretically and experimentally. In particular, the micromechanical behavior of the steel was modeled, based on the effects of the microstructure, phase fractions, local compositions of single phases and their area shapes. The developed model was used for predicting the damage behavior of a specimen. It was demonstrated that the tensile strength increased with the increasing temperature due to an increase in the amount of martensite in the steel, but the hardening behavior of this specimen was affected by the microstructure. Furthermore, the flow curves of the steel under different intercritical temperatures could be well predicted based on the real microstructures. The subsequent simulation results showed that while higher stress concentrated on the martensite, the shear-band appearance strongly depended on the microstructures of the phases. In addition, for the prediction of damage behaviors, the true stress/true strain curves of macroscale simulations showed good agreement with the experiments involving differently heat-treated steels. Keywords: intercritical treatment, steel, micro model V tem delu so teoreti~no in eksperimentalno preiskovali fazne spremembe in mikromehanske lastnosti dvofaznega jekla po kemijskih prilagoditvah. [e posebej je bilo modelirano mikromehansko obna{anje jekla glede na mikrostrukturo, dele`e posameznih faz, lokalno sestavo posameznih faz in njihovo morfologijo. Razviti model je bil uporabljen za napoved po{kodb vzorca. Dokazano je bilo, da se natezna trdnost pove~uje z nara{~ajo~o temperaturo zaradi nara{~anja vsebnosti martenzita v jeklu, vendar je na kaljivost tega vzorca vplivala mikrostruktura. Nadalje je bilo ugotovljeno, da je mo`no krivulje te~enja jekla pri razli~nih interkriti~nih temperaturah dobro napovedati na podlagi dejanskih mikrostruktur. Nadalje so rezultati simulacij pokazali, da so vi{je napetosti koncentrirane na martenzitu in isto~asna prisotnost stri`nih pasov, mo~no odvisne od mikrostruktur posameznih faz. Poleg tega je za napoved po{kodb pomembno, da se prave krivulje napetost-deformacija, dobljene s pomo~jo simulacij na makronivoju, dobro ujemajo z eksperimentalnimi, dobljenimi pri razli~no toplotno obdelanih jeklih.

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Effects of deformation and boron on microstructure and continuous cooling transformation in low carbon HSLA steels

Cited by 124 publications

References 8 publications

Formation of Microphases and Constituents from Remaining Austenite Decomposition in API X80 Steel Under Different Processing Conditions

Formation of Microphases and Constituents from Remaining Austenite Decomposition in API X80 Steel Under Different Processing Conditions

9-12Cr Heat-Resistant Steels

Phase-transformation behavior and micromechanical properties of a dual-phase steel after chemical modifications

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