Novel medium-Mn (austenite + martensite) duplex hot-rolled steel achieving 1.6 GPa strength with 20 % ductility by Mn-segregation-induced TRIP mechanism

Lee, Hyungsoo; Jo, Min Chul; Sohn, Seok Su; Zargaran, Alireza; Ryu, Jungho; Kim, Nack J.; Lee, Sunghak

doi:10.1016/j.actamat.2018.01.033

Cited by 126 publications

(24 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The concentration profile shows the inhomogeneous distribution of Mn (4.5 to 10 wt.%) across the line. Lee et al [21] showed a similar Mn-rich austenite region in Fe-0.1C-10Mn-1Si-0.3Mo-0.5 V steel. The presence of sufficient amounts of Mn and C in the banded regions at the inter-critical annealing temperature favours a high fraction of austenite phase stability at room temperature.…”

Section: Resultsmentioning

confidence: 85%

Elemental partitioning in medium Mn steel during short-time annealing: An in-situ study using synchrotron x-rays

Kalsar

Sanamar

Schell³

et al. 2020

Materialia

View full text Add to dashboard Cite

In this study, high energy synchrotron radiation was used to perform an in-situ diffraction experiment in medium Mn Fe-6Mn-0.5C-1Al alloy to study the elemental partitioning and consequent austenite phase evolution at different stages, namely, during heating, holding and cooling. It has been observed that the austenite phase fraction significantly increases on annealing at the inter-critical annealing temperature and remains stable at room temperature. The austenite phase stability at room temperature is due to the rapid partitioning of manganese (Mn) and carbon (C) during annealing. The relative change in d-spacing (Δd/d) during heating-cooling confirms the partitioning of alloying elements during inter-critical annealing.

show abstract

Section: Resultsmentioning

confidence: 85%

Elemental partitioning in medium Mn steel during short-time annealing: An in-situ study using synchrotron x-rays

Kalsar

Sanamar

Schell³

et al. 2020

Materialia

View full text Add to dashboard Cite

show abstract

“…The intrinsic factors that govern the austenite stability in medium Mn TRIP steel can be tuned based on the annealing temperature [ 182 ], duration [ 183 ], deformation (warm rolling/cold rolling) [ 184 ], and initial starting microstructures [ 185 ]. In addition to the conventional C and Mn partitioning for medium Mn TRIP steel during the intercritical annealing [ 19 , 20 ], the Mn segregation at different length scales [ 186 , 187 , 188 , 189 , 190 , 191 , 192 ] can also be employed to stabilize the austenite grains. The ultrafine austenite grain size is another vital factor in governing the austenite stability in medium Mn steel [ 63 , 193 , 194 ].…”

Section: Alloy Design Strategiesmentioning

confidence: 99%

On the Factors Governing Austenite Stability: Intrinsic versus Extrinsic

2020

Materials

View full text Add to dashboard Cite

In this review, we separate the different governing factors on austenite stability into intrinsic and extrinsic factors, depending on the domain defined by austenite grain boundaries. The different measuring techniques on the effectiveness of the governing factors in affecting the austenite stability are discussed. On the basis of the austenite stability, a new alloy design strategy that involves the competition between the intrinsic and extrinsic factors to control the transformation-induced plasticity (TRIP) effect to realize the stronger the more ductile steel is proposed. The present review may provide new insights into the development of novel thermal-mechanical processing to advance the mechanical properties of steels for industrial applications.

show abstract

“…A previous study [24] reported that the content of Mn was at 1.82 wt.% or 1.76 wt.%, the corresponding microstructure was ferrite, while the content of Mn was up to 2.9 wt.%, its microstructure was bainite/martensite. Literature [25] also suggested that segregation is caused by an enrichment of Mn in the centerline region of plates.…”

Section: Enrichment Of Elements In Segregated Regionmentioning

confidence: 99%

Controlling Variability in Mechanical Properties of Plates by Reducing Centerline Segregation to Meet Strain-Based Design of Pipeline Steel

Guo

Liu

Wang

et al. 2019

Metals

View full text Add to dashboard Cite

Low variability in mechanical properties is required for pipeline project designs to meet a strain-based design, which is used in regions of large ground movements. The objective of this study is to elucidate the influence of centerline segregation in continuously cast slab on variability in the mechanical property of pipeline steel, and controlling centerline segregation can meet the requirements of a strain-based design. Mannesmann rating method was used to evaluate the degree of segregation of two slabs and its effect on variability in mechanical properties of corresponding plates. Microstructural characterization indicated that bainite/martensite was formed in a segregated area where the content of C and Mn enriched. The mechanical property results indicated that controlling the degree of centerline segregation can reduce tensile strength variability and improve ductile-brittle transition temperature (DBTT).

show abstract

Novel medium-Mn (austenite + martensite) duplex hot-rolled steel achieving 1.6 GPa strength with 20 % ductility by Mn-segregation-induced TRIP mechanism

Cited by 126 publications

References 61 publications

Elemental partitioning in medium Mn steel during short-time annealing: An in-situ study using synchrotron x-rays

Elemental partitioning in medium Mn steel during short-time annealing: An in-situ study using synchrotron x-rays

On the Factors Governing Austenite Stability: Intrinsic versus Extrinsic

Controlling Variability in Mechanical Properties of Plates by Reducing Centerline Segregation to Meet Strain-Based Design of Pipeline Steel

Contact Info

Product

Resources

About