Ferritic-Pearlitic Steel with Deformation Induced Spheroidized Cementite

Storojeva, L.; Kašpar, Radko; Ponge, Dirk

doi:10.4028/www.scientific.net/msf.426-432.1169

Cited by 4 publications

(2 citation statements)

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“…Little work has been done on the on-line softening of medium carbon steels, which have ferrite plus spheroidized cementite structure instead of ferrite and pearlite structure being obtained in as-rolled state by controlled rolling and cooling. 13,14) The purpose of our study is to investigate the effect of DIT rolling on spheroidization of medium carbon steel. Figure 5 shows the microstructures of the commercial medium carbon 0.36%C-0.62%Mn steel (A e3 ϭ812°C, A e1 ϭ727°C, A r3 ϭ645°C and A r1 ϭ550°C at cooling rate of 5°C/s) subject to deformation at different temperatures.…”

Section: Dit and Spheroidization In Medium Carbon Steelmentioning

confidence: 99%

Grain Refinement in Steels and the Application Trials in China

et al. 2008

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In order to control microstructure and performances of steel products, the investigation has been taken to the ways to refine grains in steels and the mechanisms, the availability in industrial production of ultrafine grain steel products, and the applications of ultrafine grain steel products. It is shown that strength of steels can be increased without detriment to ductility when ferrite grains are refined to less than 4 mm in low carbon steels. Based on the study of deformation induced transformation, a new rolling technology has been developed to refine ferrite grains in plain low carbon steel rebar and strip. Plain low carbon steel rebars of 400 MPa grade, with ferrite grains in the range of 4-8 mm, have been developed as the candidate to replace microalloyed steel rebars. High strength plain low carbon steel strips in the yield strength range from 345 to 420 MPa have been used for components conventionally made of microalloyed steels. Ultrafine grained microalloyed steel strip has also been developed. A new on-line cementite spheroidization softening technology has been studied for the wire rod production of medium carbon bolt steel. It is obvious that deformation could also induce pearlite transformation in eutectoid steel.

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Section: Dit and Spheroidization In Medium Carbon Steelmentioning

confidence: 99%

Grain Refinement in Steels and the Application Trials in China

et al. 2008

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“…For medium carbon steel,therefore, through the introduction of new processing methods such as obtaining the spheroidized pearlite in line, the annealing time can be significantly reduced or even the spheroidizing annealing is omitted. However, there are rarely such research on medium carbon steel [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Undercooled Austenite during Deformation for Medium-Carbon Si-Mn Steel

Feng

Yuan

Song

2011

MSF

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The microstructure evolution of a medium-carbon Si-Mn steel during deformation of undercooled austenite at different degree of deformation, temperatures and strain rates has been investigated by means of a hot compression simulation test, metallographic microscope, scanning electron microscope and transmission electron microscopy. Also, the mechanism of carbide spheroidized during deformed process has been discussed. The experiment results demonstrate that the process of evolution experienced three stages: that is, strain-induced transformation, austenite eutectoid decomposed to carbides and ferrite matrix, and spheroidization of pearlite at the range of A3-Ar3. The austenitic grains would be refined for the extra-product of ferrite above the Ar3. The eutectoid reaction was induced on the grain boundaries of ferrite and non-transformed austenite and deformation bands with the increasing volume of deformation. An optimum combination of deformation temperature and strain rate is important to obtian the dulplex microstructure consisting of ultrafine ferrites and dispersed carbide particles. The fine spheroidized microstructures are obtained while the deformed temperature reaches 650°C with ≥1.0, meanwhile, The carbides precipate in globular and shot-rod shapes. Keywords: Medium-carbon Si-Mn steel, Undercooled austentite, Microstructure evolution, Deformation induced transformation, Carbide spheroidization

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