Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2014 - zeszyt 2

Formation of ferritic-bainitic structure with retained austenite in hypoeutectoid steel

nr katalogowy: 84285

The very important aim of developing new grades of steel is to obtain a specific structure which guaranties a combination of high strength and high ductility. A newly developed family of Advanced High Strength Steels (AHSS) meets such requirements to a large extent [1÷4]. These include different multiphase steels such as: Dual Phase (DP), Complex Phase (CP), and Transformation Induced Plasticity (TRIP) steels [1], which give the possibility of obtaining good mechanical properties through manipulating with the type of phase, its volume fraction and spatial arrangement. DP steels are ferritic-martensitic steels, whereas CP steels consist of at least three phases amongst: ferrite, bainite, martensite and austenite. Annealing in the intercritical region plays an important role in the process of forming phase structure in CP and DP steels, since it enables to manipulate with the volume fractions of austenite and ferrite. Another interesting subgroup of AHSS family is steels with TRIP effect, in which carbon-enriched austenite is formed as a result of precise control of phase transformations [2]. The aforementioned phase is transformed into martensite during plastic deformation, which prevents necking deformation and premature rupture [3]. The presence of martensite in addition to ferrite (in the DP steels) results in limited formability when plastic forming methods are used [4]. Replacement of martensite with bainite in such grades of steels may increase this property [4]. In this paper, an attempt to produce a complex-phase steel with ferritic-bainitic structure with retained austenite was described. To form such a structure the process of annealing in intercritical region was used in order to obtain defined fractions of austenite and ferrite, followed by quenching with an isothermal holding in the bottom range of temperatures of bainitic transformation. It was assumed that the presence of retained austenite would increase ductil[...]

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e-Publikacja (format pdf) - nr 84285 "Formation of ferritic-bai..." licencja: Osobista Produkt cyfrowy	10.00 zł

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2014-2

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