Manufacturing of advanced high-strength steels (AHSS)

Theyssier, M.-C.

doi:10.1016/b978-0-85709-436-0.00003-5

Cited by 16 publications

(17 citation statements)

References 8 publications

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“…9) Silicon and aluminum are key components in these grades and often replace each other, since both inhibit cementite formation and allow more carbon to be partitioned and stabilize austenite. [9][10][11] There have been numerous studies on the solid-state thermomechanical processing of these steels, [1][2][3][4][5][6][7] but there are far fewer studies dealing with melting, refining, and casting of these grades. 12) As interest in 3rd Generation AHSS increases, characterization of microstructure and properties during processing could be used to diagnose potential issues during large-scale production.…”

Section: Effect Of Silicon On Ahss As-cast Microstructure Developmentmentioning

confidence: 99%

“…1) The Advanced High Strength Steel (AHSS) grades enable achieving both of these performance goals in a cost-effective way. 2) The AHSS grades are typically categorized by their mechanical properties, most often combinations of tensile strength vs. elongation. The first generation of AHSS were the dual phase (DP), complex phase (CP) and transformation induced plasticity (TRIP).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Silicon on AHSS As-Cast Microstructure Development and Properties

Giacomin

Webler

2019

ISIJ Int.

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This work linked properties and performance in as-cast condition for 3rd generation advanced high strength steel (AHSS) by examining the effects of chemical composition and microstructure on mechanical properties. Elevated levels of carbon, manganese, and silicon in new AHSS grades lead to a complex evolution of microstructure during solidification that can lead to castability problems. Three lab cast ingots with 0.2 wt% C, 3 wt% Mn, and 0.5, 1.5, and 3 wt% Si were characterized by their microstructure and mechanical properties. Light optical microscopy (LOM) and Scanning Electron Microscopy (SEM) confirmed that the microstructure of steels was mostly granular bainite, with some proeutectoid ferrite allotriomorphs at 3 wt% Si. Tensile testing showed Si increased strength and that ductility of all samples was low. Higher silicon levels were found to promote formation of proeutectoid ferrite allotriomorphs and changed the cracking propagation behavior. Some comparisons between the observed microstructures and those expected in continuously cast slabs were also discussed.

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Section: Effect Of Silicon On Ahss As-cast Microstructure Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Silicon on AHSS As-Cast Microstructure Development and Properties

Giacomin

Webler

2019

ISIJ Int.

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“…Efforts in the automotive industry to improve fuel economy and safety standards have helped spur the development of advanced high‐strength steels (AHSS). [ 1,2 ] The combination of both high strength and ductility in AHSS enables lightweighting without compromising on vehicle crashworthiness. Relatively high strength and ductility were achieved in first‐generation generation AHSS using multiconstituent microstructures, such as the ferrite/martensite microstructure of dual‐phase (DP) steels.…”

Section: Introductionmentioning

confidence: 99%

Effects of Si on the Ductile‐to‐Brittle Transition Behavior of As‐Cast Advanced High‐Strength Steels

Giacomin

Bollinger

Komolwit³

et al. 2022

steel research int.

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High Si concentrations in third‐generation advanced high‐strength steels (AHSS) are known to cause cracking in continuous cast slabs during cooling at temperatures below 300 °C. To investigate the mechanism connecting Si to this embrittlement, impact toughness tests are conducted on as‐cast Fe–0.2C–3.0Mn steels with 0.5, 1.5, and 3.0 wt% Si at temperatures between 100 and 400 °C. The propagation path of the cracks through the microstructure of the specimens is examined. The ductile‐to‐brittle transition (DBT) behaviors of the three steels are compared. Higher Si concentrations raise the DBT temperature of the steels. The influence of Si on both solid‐solution strengthening and autotempering during cooling likely contributes to this by increasing the hardness of these as‐cast microstructures. In addition, the precipitation of pro‐eutectoid ferrite (αPE), which is promoted by higher Si concentrations, significantly lowers the upper shelf energy of the DBT curve. The αPE phase also alters the propagation path of brittle fracture in the specimens, potentially contributing to the increase in DBT temperature. The increase in DBT temperature and decrease in upper shelf energy may contribute to the as‐cast AHSS slab embrittlement at low temperatures observed in the industry.

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“…Dentro de los aceros de alta resistencia desarrollados se destacan los aceros bainíticos libres de carburo (CFBpor sus siglas en ingles) y los de temple y partición de carbono (Q&Ppor sus siglas en inglés). El estudio de estos aceros se ha centrado en materiales conformados, razón por la cual hay muy poca información disponible sobre la obtención de estos aceros para piezas fundidas [1,2]. El desarrollo de estos aceros para piezas fundidas permitiría obtener piezas, semiterminadas o terminadas, con geometrías complejas, que no se pueden lograr fácilmente mediante deformación plástica como laminado o forja, por lo que desarrollar aceros fundidos CFB o Q&P es una forma de mejorar las aplicaciones potenciales de las microestructuras en cuestión.…”

Section: Introductionunclassified

ESTUDIO MICROESTRUCTURAL DE UN ACERO FUNDIDO ALTO CARBONO-ALTO SILICIO SOMETIDO A TRATAMIENTOS TÉRMICOS DE AUSTEMPERADO Y Q&P

2022

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En el presente trabajo se estudió la influencia de la estructura de partida de un acero alto C – alto Si, as-cast (AC), deformado en caliente (DC) y homogenizada (H), sobre la microestructura producto de aplicar tratamientos térmicos de baja temperatura: austemperado y Quenching and Partitioning (Q&P). Para tal efecto, se austemperaron muestras del a 300°C durante 120 min y se trataron también, vía Q&P, con el ciclo de QT a 180°C/2 min., y PT a 200°C/30min. La caracterización del material se realizó por medio de microscopía óptica (MO), microscopia electrónica de barrido (MEB), análisis de difracción de rayos X (DRX) y mediciones de microdureza Vickers. Los resultados mostraron que las muestras en estado AC y DC presentaron patrones de segregación marcados, lo que afectó las cinéticas de transformación en estado sólido y por ende favoreció un alto grado de heterogeneidad en la estructura final. Por su parte, las muestras H, no evidenciaron patrones de segregación y los niveles de transformación presentaron un alto grado de uniformidad en las estructuras bainíticas y martensítica producto de los ciclos térmicos aplicados.

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Manufacturing of advanced high-strength steels (AHSS)

Cited by 16 publications

References 8 publications

Effect of Silicon on AHSS As-Cast Microstructure Development and Properties

Effect of Silicon on AHSS As-Cast Microstructure Development and Properties

Effects of Si on the Ductile‐to‐Brittle Transition Behavior of As‐Cast Advanced High‐Strength Steels

ESTUDIO MICROESTRUCTURAL DE UN ACERO FUNDIDO ALTO CARBONO-ALTO SILICIO SOMETIDO A TRATAMIENTOS TÉRMICOS DE AUSTEMPERADO Y Q&P

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