Hall-Petch Relation in a Spheroidized Carbon Steel with Emphasis on the Effect of Intergranular Particles

Abstract:

The Hall-Petch relation in a spheroidized steel with bimodal cementite particle size distribution has been investigated in this study, with an emphasis on considering the effect of the large particles at ferrite grain boundaries and triple junctions. A medium carbon steel was processed by variable thermomechanical procedures to achieve spheroidized structures with different combinations of microstructrual parameters, but all exhibiting a bimodal particle size distribution, in which large intergranular particles and small intragranular particles coexisted in the ferrite matrix. A quantitative relationship between the Hall-Petch parameter k_y and the volume fraction of the intergranular cementite particles is presented, by considering a composite model. The contribution of the large intergranular particles to grain boundary strengthening wa substantiated by the increment of the k_y parameter, since the average orientation factor of the composite, is increased. After correction of the k_y parameters based on the constants from literatures, the predicted stresses show good agreement with the experimental stresses. A linear fit between the experimental stresses and the reciprocal square root of grain sizes is performed, the slope constant k_y derived agrees to within 11 % of the corrected k_y parameters based on the constants from literatures.

• Periodical: Materials Science Forum (Volume 848)
• Pages: 593-606
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.848.593
• Online since: March 2016
• Authors: Jiang Li Ning, Yun Li Feng, Jie Li
• Keywords: Carbon Steel, Hall-Petch, Orientation Factor, Spheroidized Cementite, THERMOMECHANICAL PROCESSING

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