The Influence of Subgrain Size on the Bainite Refinement for Steels

Xue Min Wang; Cheng Jia Shang; S.W. Yang; Xin Lai He

doi:10.4028/www.scientific.net/MSF.715-716.977

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HomeMaterials Science ForumMaterials Science Forum Vols. 715-716The Influence of Subgrain Size on the Bainite...

The Influence of Subgrain Size on the Bainite Refinement for Steels

Abstract:

The relaxation-precipitation-controlling phase transformation (RPC) technique after deformation at non-recrystallization zone to refine the intermediate transformation microstructure has been simulated on a Gleeble-1500 thermo-simulator. The optical microscope, SEMTEMPTA(particle tracking autoradiography) technique to reveal the boron distribution were employed to study the variation of austenite grain size and subgrain size, the features of microstructure after RPC, precipitation and the evolution of dislocation configuration during the relaxation and the boron distribution. The results show that after relaxation at non-recrystallization zone, the subgrain formed inside an original austenite grain. With the relaxation time increasing, the size of the subgrains increased and the misorientation also increased. During the cooling after the relaxation the boron can also segregate at the boundaries of subgrains and the boron segregation can reveal the subgrains forming in deformed austenite before phase transformation. It has been found that during the relaxation strain induced precipitates occurs and these precipitates can pin the subgrain boundary and make it more stable. Comparing the subgrain size demonstrated by PTA with the optical microstructure a conclusion can be drawn that the packet of bainite generally cannot break through the boundaries of subgrains, so the subgrain appearing at the relaxation stage can confine the growth of the microstructure during the transformation in succeeding and the final bainite is refined.

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Periodical:

Materials Science Forum (Volumes 715-716)

Pages:

977-982

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.715-716.977

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Online since:

April 2012

Authors:

Xue Min Wang, Cheng Jia Shang, S.W. Yang, Xin Lai He

Keywords:

Austenite Subgrain, Bainite Refinement, Boron Distribution, Relaxation-Precipitation-Controlling Phase Transformation Technique

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