M�ssbauer analysis of state of cementite isolated from tempered aluminum steel

Arbuzov, M. P.; Yatsura, M. M.; Kirichok, P. P.; Kotlyar, B. I.; Sologub, N. I.

doi:10.1007/bf00891405

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“…In alloyed steels the rapid precipitation of very small intermetallic particles would be favourable to maintaining the structure of dislocations, and therefore carbon segregation, at higher tempering temperatures. The direct precipitation of M 2 C carbides, without precipitation of iron carbides, can also be supported, taking into consideration the influence of alloying elements, such as silicon and aluminium, which delay cementite precipitation at higher tempering temperatures [35,36]. This effect can be so strong for an aluminium content of around 1 wt.% that cementite is absent from the sequence, and the M 2 C carbide directly nucleates at the dislocation sites, as already suggested by Olson [4] for AF1410 steel.…”

Section: How To Eliminate Iron Carbide Precipitation During the Tempering Process?mentioning

confidence: 99%

Cementite-free martensitic steels: A new route to develop high strength/high toughness grades by modifying the conventional precipitation sequence during tempering

et al. 2012

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Aluminium was added to a 0.2% C-2.5% Cr-1.4% Mo-11% Ni steel to modify the precipitation sequence during tempering treatment. The main goal was to obtain fine co-precipitation of an intermetallic phase and M 2 C carbides (where M is a combination of Cr, Mo and small amounts of Fe). Small angle neutron scattering, synchrotron X-ray diffraction, transmission electron microscopy and atom probe tomography were performed to characterize the nanometric precipitation. The tempering response of samples austenitized at 900 °C revealed a strong interaction between the two types of precipitation, leading to a significant modification of both the precipitation sequence of carbides and the arrangement of carbide nucleation sites compared with these sites in a single precipitation steel. Indeed, a microstructural investigation clearly showed that iron carbide precipitation was either delayed or did not occur during the tempering process, depending of the alloying elements added. Moreover, double precipitation directly influenced the mechanical resistance, as well as the toughness, leading to an ultrahigh-strength, high toughness steel.

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Section: How To Eliminate Iron Carbide Precipitation During the Tempering Process?mentioning

confidence: 99%