Quenching and partitioning treatment of a low-carbon martensitic stainless steel

Tsuchiyama, Toshihiro; Tobata, Junya; Tao, Teruyuki; Nakada, Nobuo; Takaki, Setsuo

doi:10.1016/j.msea.2011.10.125

Cited by 130 publications

(70 citation statements)

References 13 publications

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“…39,40 Cementite formation also consumes available carbon in ferritic and martensitic stainless steels subjected to Q&P during the partitioning step. [41][42][43] An APT/TEM study of 4340 steel has provided new insights into complex atomic scale chemical and nano-scale structural changes that occur after tempering, particularly with respect to the location and distribution of carbon and alloying elements within cementite and tempered martensite/ferrite. 36 The role of alloying elements on transition carbide (e.g.…”

Section: Austenite/martensite Interfacial Migration and Martensite Tementioning

confidence: 99%

“…Additional product types such as martensitic stainless steels have been explored more recently. [41][42][43] Thermomechanical processing of austenite and non-isothermal partitioning have been explored for steels that are not produced using continuous strip annealing facilities, [44][45][46][47][48][49][50][51][52] including some facility related considerations. The process related developments have also evaluated Q&P thermal signatures within other manufacturing environments, such as hot stamping/press quenching and various tubemaking scenarios.…”

Section: Qandp Process Variantsmentioning

confidence: 99%

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Critical Assessment 7: Quenching and partitioning

Speer

Moor

Clarke

2015

Materials Science and Technology

136

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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: Austenite/martensite Interfacial Migration and Martensite Tementioning

confidence: 99%

Section: Qandp Process Variantsmentioning

confidence: 99%

Critical Assessment 7: Quenching and partitioning

Speer

Moor

Clarke

2015

Materials Science and Technology

136

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“…Since the first is asymmetric with respect to the sign of x, it has a third-order term in the elastic energy. Its coefficient gives the third-order bulk modulus, B (3) , which is defined by the formula (5) is readily found by letting e 1 = e 2 = e 3 = x and e 4 = e 5 = e 6 = 0 in Eq. (3) and comparing the final form with Eq.…”

Section: Determination Of Elastic Constantsmentioning

confidence: 99%

“…A fully martensitic structure produces the maximum hardness in conventional carbon steel, and the martensite is the key component also in modern advanced products such as DP (dual phase), TRIP (transformation-induced plasticity), and Q&P (quench and partitioning) steels. [1][2][3] The strength, or hardness, of martensite is believed to be caused by solid-solution strengthening, high density of dislocations, as well as its complex microstructure resulting from the characteristic cubic-to-tetragonal transformation. The elastic stiffness of the martensite is also of interest, first for its own sake as one of the mechanical properties, and second because elastic misfit is an important factor controlling the microstructure formation, in addition to lattice misfit.…”

Section: Introductionmentioning

confidence: 99%

Elastic Properties of Fe–C and Fe–N Martensites

Souissi

Numakura

2015

ISIJ International

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Single-crystal elastic constants of bcc iron and bct Fe-C and Fe-N alloys (martensites) have been evaluated by ab initio calculations based on the density-functional theory. The energy of a strained crystal has been computed using the supercell method at several values of the strain intensity, and the stiffness coefficient has been determined from the slope of the energy versus square-of-strain relation. Some of the third-order elastic constants have also been evaluated. The absolute magnitudes of the calculated values for bcc iron are in fair agreement with experiment, including the third-order constants, although the computed elastic anisotropy is much weaker than measured. The tetragonally distorted dilute Fe-C and Fe-N alloys exhibit lower stiffness than bcc iron, particularly in the tensor component C 33 , while the elastic anisotropy is virtually the same. Average values of elastic moduli for polycrystalline aggregates are also computed. Young's modulus and the rigidity modulus, as well as the bulk modulus, are decreased by about 10% by the addition of C or N to 3.7 atomic per cent, which agrees with the experimental data for Fe-C martensite.

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“…2,3 The workpiece is then heated to, and held at, the partitioning temperature (PT). 4 With regard to the austenite stabilization, carbon must not precipitate in the form of carbides at the PT. To ensure this, aluminium, silicon or phosphorus should be used as alloying additions.…”

Section: Qandp Processingmentioning

confidence: 99%

Production of shaped semi-products from AHS steels by internal pressure

Vorel¹,

Jirková²,

Mašek³

et al. 2015

Mater. Tehnol.

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The constant evolution of industry brings demands for components of ever-higher quality, complex shapes and excellent mechanical properties, with reduced operating costs and with improved reliability in service. Such demands can be met by processing high-strength, low-alloyed steels using novel heat-treatment methods. One of such methods is the quenching and partitioning (Q&P) process, which can lead to high strengths of about 2000 MPa at elongation levels of more than 10 %. The Q&P process can be combined with unconventional procedures for making complex-shaped parts to manufacture components with excellent mechanical properties and an intricate shape. This paper describes the sequence of internal high-pressure forming, hot stamping and the Q&P process used for making a functional product with good mechanical properties and a complex shape. The purpose of the experimental programme was to employ a production chain for processing hollow, thin-walled stock. Using a step-by-step optimization, commercially usable products were obtained. The microstructure of the products consisted primarily of martensite and a small fraction of bainite. Such a microstructure guarantees a high ultimate strength. The strength level throughout the part was not less than 1950 MPa, combined with an excellent elongation of approximately 15 %. Keywords: Q&P process, hot stamping, internal high pressure forming Stalen razvoj industrije zahteva komponente vedno bolj{ih kvalitet, kompleksnih oblik, odli~nih mehanskih lastnosti pri ni`jih proizvodnih stro{kih in z ve~jo zanesljivostjo obratovanja. Take zahteve se lahko dose`ejo z izdelavo visokotrdnostnih malolegiranih jekel z uporabo novih metod toplotne obdelave. Ena od takih metod je postopek kaljenja in delitve (Q&P), ki omogo~a velike trdnosti okrog 2000 MPa pri ve~kot 10-odstotnem raztezku. Postopek Q&P se lahko kombinira z nekonvencionalnimi metodami izdelave delov s kompleksno obliko in za izdelavo komponent z odli~nimi mehanskimi lastnostmi in komplicirano obliko. Predstavljeni~lanek obravnava zaporedne operacije notranjega visokotla~nega preoblikovanja, vro~ega stiskanja in Q&P-postopka za izdelavo funkcionalnih proizvodov z dobrimi mehanskimi lastnostmi in zapleteno obliko. Namen eksperimentalnega dela je bil postaviti proizvodno verigo za izdelavo votlih tankostenskih kosov. Z optimizacijo korak za korakom so bili izdelani komercialno uporabni proizvodi. Mikrostruktura proizvodov je bila sestavljena predvsem iz martenzita in majhnega dele`a bainita. Taka mikrostruktura zagotavlja veliko natezno trdnost. Nivo trdnosti po vsem kosu ni bil manj{i od 1950 MPa v kombinaciji z odli~nim raztezkom okrog 15 %. Klju~ne besede: Q&P-proces, vro~e stiskanje, preoblikovanje z velikim notranjim tlakom

show abstract

Quenching and partitioning treatment of a low-carbon martensitic stainless steel

Cited by 130 publications

References 13 publications

Critical Assessment 7: Quenching and partitioning

Critical Assessment 7: Quenching and partitioning

Elastic Properties of Fe–C and Fe–N Martensites

Production of shaped semi-products from AHS steels by internal pressure

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