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Investigation on martensitic steel using a quenching-partitioning-tempering process via electron backscatter diffraction analysis

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Abstract

A new quenching-partitioning-tempering (Q-P-T) process was designed based on the recently developed quenching and partitioning (Q & P) treatment by Speer et al. The orientation relationships (ORs) of martensite (α) in Q-P-T steel tempered under different conditions were investigated using a scanning electron microscope with an electron backscatter diffraction unit. The morphology and crystallography of lath martensite within a packet were analyzed. Martensites exhibiting an initial austenite (γ) grain in the orientation image map of different samples were chosen and their {111}α pole figures were drawn. The pole figures were fitted according to the ideal Kurdjumov-Sachs (K-S) and Nishiyama-Wasserman (N-W) ORs, which were calculated using Matlab and with a γ crystal-oriented (001)γ[100]γ as the reference frame. The martensite OR in the Q-P-T steel follows both the K-S and N-W ORs; however, the K-S OR is predominant. This characteristic does not change in the samples further tempered at different temperatures.

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  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Song Chen & Hao Yu

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  1. Song Chen
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  2. Hao Yu
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Correspondence to Song Chen.

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Chen, S., Yu, H. Investigation on martensitic steel using a quenching-partitioning-tempering process via electron backscatter diffraction analysis. Sci. China Technol. Sci. 55, 646–651 (2012). https://doi.org/10.1007/s11431-011-4658-8

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  • DOI: https://doi.org/10.1007/s11431-011-4658-8

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