Characterization of the metastable austenite in low-alloy FeCMnSi TRIP-aided steel by neutron diffraction

Barbé, Liesbeth; Conlon, K. T.; Cooman, Bruno C. De

doi:10.3139/146.021217

Cited by 18 publications

(23 citation statements)

References 21 publications

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“…Precipitation of transition carbides within retained austenite during martensite tempering has not been documented. Since the chemical potential of carbon is much higher in as-quenched martensite than in the retained austenite, it is reasonable to conclude that carbide nucleation would be more likely in bcc ferrite than in austenite 9,19 . The α/γ interface is also a favored site for carbide formation.…”

Section: Importance Of Suppressing Carbide Precipitationmentioning

confidence: 99%

The "quenching and partitioning" process: background and recent progress

et al. 2005

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A new process concept, "quenching and partitioning" (Q&P) has been proposed recently for creating steel microstructures with retained austenite. The process involves quenching austenite below the martensitestart temperature, followed by a partitioning treatment to enrich the remaining austenite with carbon, thereby stabilizing it to room temperature. The process concept is reviewed here, along with the thermodynamic basis for the partitioning treatment, and a model for designing some of the relevant processing temperatures. These concepts are applied to silicon-containing steels that are currently being examined for low-carbon TRIP sheet steel applications, and medium-carbon bar steel applications, along with a silicon-containing ductile cast iron. Highlights of recent experimental studies on these materials are also presented, that indicate unique and attractive microstructure/property combinations may be obtained via Q&P. This work is being carried out through a collaborative arrangement sponsored by the NSF in the USA, CNPq in Brazil, and the EPSRC in the United Kingdom.

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Section: Importance Of Suppressing Carbide Precipitationmentioning

confidence: 99%

The "quenching and partitioning" process: background and recent progress

et al. 2005

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“…Aluminum addition to these steels brings on higher carbon concentration of retained austenite than silicon addition 2,3) without a decline of the galvanizability, 3) although its solid solution hardening is lower than that of silicon. Thus, some researchers [2][3][4][5] investigated the effects of aluminum addition on microstructure, strain-induced transformation behavior, ductility and formability of low alloy TRIP-aided steel with polygonal ferrite matrix (called PF steel).…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Formability of Aluminum Bearing TRIP-Aided Steels with Annealed Martensite Matrix

et al. 2005

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The effects of aluminum content on microstructure, ductility and formability of advanced high strength low alloy TRIP (Transformation-Induced Plasticity)-aided ferrous sheet steels with annealed martensite matrix (or TRIP-aided annealed martensitic steel) were investigated in order to realize hot-dip galvanization. Aluminum addition of 0.5-1.0 mass% (and simultaneous silicon removal of the same amount) to a 0.2C-1.5Si-1.5Mn-0.04Al (mass%) steel refined the matrix structure and retained austenite needles and increased carbon concentration of retained austenite. It also brought on an excellent total elongation, stretchflangeability and bendability, although the tensile strength decreased. Optimum austempering temperature for the total elongation increased to 450-475ЊC, due to the increased carbon concentration of retained austenite. On the other hand, optimum austempering temperatures for the stretch-flangeability and bendability were maintained at 350-400ЊC, mainly due to uniform fine lath matrix and retained austenite needles. If only large total elongation is required for the TRIP-aided steel, it is expected that hot-dip galvanizing immediately after continuous intercritical annealing can be realized.

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“…The expressions for the driving force and kinetic relation for plastic slip in the BCC ferrite can be obtained analogous to those for the FCC austenite in (23) and (24), by applying the following replacements…”

Section: Driving Forces Kinetic Relations and Hardening Lawmentioning

confidence: 99%

“…However, these models mainly focus upon mechanically-driven martensitic transformations, without taking into account the effect of temperature variations on the transformation behavior. On the other hand, the characteristics of martensitic transformations in TRIP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 steel microstructures during cooling have been investigated in recent experimental and modeling works [19][20][21][22][23][24]. Several empirically-and thermodynamically-based models have been proposed for predicting the transformation behavior in multiphase TRIP steels subjected to cooling.…”

Section: Introductionmentioning

confidence: 99%