Effect of Carbon and Manganese on the Quenching and Partitioning Response of CMnSi Steels

Moor, Emmanuel De; Speer, John G.; Matlock, David K.; Kwak, Jai Hyun; Lee, Seung-Bok

doi:10.2355/isijinternational.51.137

Cited by 184 publications

(105 citation statements)

References 19 publications

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“…For instance, tensile strength levels of 1500 MPa in combination with total elongation values in excess of 15% have been obtained in a 0?3C-3Mn-1?6Si (wt-%) alloy. 80 These property levels represent a special niche that is not readily achieved in low alloy steels processed by other methods, and unique property combinations can be obtained at even greater strength levels.…”

Section: Mechanical Behaviourmentioning

confidence: 99%

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Critical Assessment 7: Quenching and partitioning

Speer

Moor

Clarke

2015

Materials Science and Technology

138

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Quenching and partitioning is a relatively new heat treatment concept to generate microstructures containing retained austenite stabilised by carbon partitioning from martensite. Research on quench and partitioning has been conducted by numerous groups, and this critical assessment provides some of the authors’ perspectives on progress and understanding in the field, with particular focus on the physical metallurgy and transformation mechanisms, process variations, mechanical behaviour, and industrial implementation. While much progress has been made, the field provides rich opportunity for further understanding and development.

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Section: Mechanical Behaviourmentioning

confidence: 99%

“…Increased manganese levels [80][81][82] have been shown to be effective at improving tensile properties in Q&P steels. For instance, tensile strength levels of 1500 MPa in combination with total elongation values in excess of 15% have been obtained in a 0?3C-3Mn-1?6Si (wt-%) alloy.…”

Section: Mechanical Behaviourmentioning

confidence: 99%

Critical Assessment 7: Quenching and partitioning

Speer

Moor

Clarke

2015

Materials Science and Technology

138

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“…[1][2][3] The alloying concept of these steels relies on relatively high carbon content (up to 0.8 wt%) together with silicon and/or aluminum alloying.…”

Section: Introductionmentioning

confidence: 99%

Effects of Carbon Content and Cooling Path on the Microstructure and Properties of TRIP-aided Ultra-High Strength Steels

Suikkanen¹,

Ristola

Hirvi³

et al. 2013

ISIJ Int.

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The effects of carbon content in the range 0.2-0.4 wt% and thermomechanical treatment parameters on the mechanical properties and microstructures of steels containing 0.5Si-2.0Mn-1.0Al-0.6Cr have been studied in order to help develop an efficient processing route for ultra-high-strength TRIP-aided martensitic-bainitic structural steels. The microstructures consist of granular bainite, lath-like bainite, martensite and up to 23 volume % retained austenite as granular islands and lath-like films. Microsegregation of chromium and manganese results in the formation of martensite-rich bands, the volume fraction of which increases with carbon content. Bands of martensite, induced by the segregation of chromium and manganese, become more prominent with increasing carbon content. Good combinations of tensile strength, elongation and impact toughness can be achieved with 0.2 or 0.3 wt% carbon by thermomechanical rolling followed by water quenching to 150-350°C and isothermal holding for 2 h at the quenching stop temperature. The steel with 0.4 wt% carbon shows high strength and good uniform elongation due to high contents of retained austenite, but its impact toughness is clearly inferior to its lower carbon counterparts. Annealing to alleviate microstructural banding produced a marked improvement in impact toughness.

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“…Earlier studies have shown that the Q&P processing of various AHSS enables the use of the TRIP effect to achieve a pronounced improvement of mechanical strength and ductility. [7][8][9] The Q&P processing consists of three stages: an initial quenching stage, a partitioning stage, and a final quenching stage. The austenitized steel is initially quenched to a temperature, T Q , in the M s À M f temperature range, and partially transformed to primary martensite.…”

mentioning

confidence: 99%

Application of Quenching and Partitioning Processing to Medium Mn Steel

Seo

Cho

Cooman

2014

Metall Mater Trans A

101

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The present work analyzes the application of quenching and partitioning processing to medium Mn steel to obtain a new type of ultra-high-strength multiphase medium Mn steel. The selection of the quench temperature makes it possible to vary the ultimate tensile strength within a range of 500 MPa. The processing leads to lowcarbon lath martensite matrix with a controlled volume fraction of retained austenite. Increasing requirements related to passenger safety and weight reduction in the automotive industry have led to the development of a first generation of advanced high strength steels (AHSS) such as dual phase and transformation-induced plasticity (TRIP) steels. Second generation austenitic high-Mn twinning-induced plasticity (TWIP) steel with a Mn content in the range of 15 to 25 wt pct exhibits an excellent combination of tensile strength (~1 GPa) and ductility (~60 pct) due to a dynamic Hall-Petch effect resulting from the gradual increase of the density of mechanical twins during deformation.[1,2] The higher alloying costs and the lower productivity associated with high-Mn TWIP steel are currently the main drivers behind the development of the intermediate and medium Mn steel. Adequate combinations of mechanical properties have been reported for intercritically annealed intermediate and medium Mn steels. Their high work-hardening rate is achieved by the TRIP effect or a combination of two plasticity-enhancing mechanisms, the TWIP effect and the TRIP effect. [3][4][5] The Mn content in these materials is typically one third of the Mn content of the high-Mn TWIP steels, but despite their lower Mn content, these steels achieve excellent mechanical properties with a strength-ductility balance in the range of 35,000 to 45,000 MPa pct.Quenching and partitioning (Q&P) processing was proposed by Speer et al.[6] as a new approach to produce steel microstructures consisting of a low-C martensitic matrix containing a considerable volume fraction of retained austenite. Earlier studies have shown that the Q&P processing of various AHSS enables the use of the TRIP effect to achieve a pronounced improvement of mechanical strength and ductility. [7][8][9] The Q&P processing consists of three stages: an initial quenching stage, a partitioning stage, and a final quenching stage. The austenitized steel is initially quenched to a temperature, T Q , in the M s À M f temperature range, and partially transformed to primary martensite. It is then partition treated at the partitioning temperature, T P . During the partitioning stage, C diffuses from the supersaturated primary martensite into the untransformed austenite. As a result, the M s temperature of the C-enriched austenite is lowered. This leads to the stabilization of the untransformed austenite upon cooling to room temperature. If C does not partition enough to austenite, some of the austenite will transform to secondary martensite in the final quenching stage. The final microstructure consists of C-enriched austenite islands in a low-C lath martensite matrix. The martens...

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Effect of Carbon and Manganese on the Quenching and Partitioning Response of CMnSi Steels

Abstract: Fig. 13. Situation of properties obtained in current research with respect to other proposed third generation AHSS development routes. 16) The data were collected from literature and corrected according to ISO 2566/1-1984(E) 34) to the ASTM E8 geometry.

Cited by 184 publications

References 19 publications

Critical Assessment 7: Quenching and partitioning

Critical Assessment 7: Quenching and partitioning

Effects of Carbon Content and Cooling Path on the Microstructure and Properties of TRIP-aided Ultra-High Strength Steels

Application of Quenching and Partitioning Processing to Medium Mn Steel

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