Decomposition of austenite

Баранов, А. А.; Geller, A. L.; Konarev, V. G.

doi:10.1007/bf00693278

Cited by 3 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…None of these terms refer specifically to the transformation of Figure 1(b). It does not seem appropriate to call the reaction of Figure 1(b) a type of pearlite transformation, as was done by Whiteley [4] and by translations of Russian articles, [32,33,34] even though it forms at the same temperatures at which pearlite forms, because the term pearlite has traditionally referred to the lamellar microstructure. In fact, the name pearlite originated by Sorby [38] and Howe [39] because of the lamellar structure's ability to diffract white light in a manner similar to motherof-pearl shells.…”

Section: Discussionmentioning

confidence: 99%

“…The occurrence of the DET in steels appears to be well recognized in the Russian literature, where the transformation is generally called the granular pearlite transformation in English translations. [31] Recent articles [32,33,34] have presented studies on how to promote spheroidization through control of the DET. [31] Recent articles [32,33,34] have presented studies on how to promote spheroidization through control of the DET.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The divorced eutectoid transformation in steel

Verhoeven

Gibson

1998

Metall Mater Trans A

131

View full text Add to dashboard Cite

Experiments are presented which show that the eutectoid transformation in steel can occur by two different modes for temperatures just slightly below A 1 . In the normal mode, the transformation product is lamellar pearlite. The second mode occurs if the austenite contains cementite particles or nuclei with a spacing on the order of a few microns or less. In this case, the transformation product consists of spheroidal cementite particles in a ferrite matrix. This second mode is here called the divorced eutectoid transformation (DET), after recent work by Sherby and co-workers. A literature survey shows that the faster kinetics of the DET over lamellar pearlite in the presence of inhomogeneous austenite was established before 1940, but has received little attention. The inhomogeneities are generally small cementite particles. Experiments show that the DET does not occur by a shell of one phase (ferrite) forming around the other phase of the eutectoid (cementite), as is the case in divorced eutectic growth. Rather, a fairly planar austenite/ferrite front simply advances into the austenite, with no apparent effect on its shape being produced by the cementite particles. A firstorder kinetic model is presented for the growth velocity as a function of undercooling below A 1 and is compared to the velocity vs undercooling for lamellar pearlite. The simple model indicates that the velocity of the divorced mode should be faster than the lamellar mode at low undercooling for cementite nuclei distributed in the austenite with spacings less than a few microns. This result is consistent with the experimental data.

show abstract

Section: Discussionmentioning

confidence: 99%