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Work Hardening, Dislocation Structure, and Load Partitioning in Lath Martensite Determined by In Situ Neutron Diffraction Line Profile Analysis

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Abstract

A lath martensite steel containing 0.22 mass pct carbon was analyzed in situ during tensile deformation by high-resolution time-of-flight neutron diffraction to clarify the large work-hardening behavior at the beginning of plastic deformation. The diffraction peaks in plastically deformed states exhibit asymmetries as the reflection of redistributions of the stress and dislocation densities/arrangements in two lath packets: soft packet, where the dislocation glides are favorable, and hard packet, where they are unfavorable. The dislocation density was as high as 1015 m−2 in the as-heat-treated state. During tensile straining, the load and dislocation density became different between the two lath packets. The dislocation character and arrangement varied in the hard packet but hardly changed in the soft packet. In the hard packet, dislocations that were mainly screw-type in the as-heat-treated state became primarily edge-type and rearranged towards a dipole character related to constructing cell walls. The hard packet played an important role in the work hardening in martensite, which could be understood by considering the increase in dislocation density along with the change in dislocation arrangement.

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Acknowledgments

The authors acknowledge Professor Shigeo Sato of Ibaraki University for the valuable discussion. ND experiments were performed at BL19 in the Materials and Life Science Facility of J-PARC under proposals 2014I0019 and 2014P0102. Partial financial support was provided by the Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research (Grant Nos. 26289264, 15H05767) and Education Commission of Hubei Province of China (Grant No. B20161203).

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Authors and Affiliations

  1. J-PARC Center, Japan Atomic Energy Agency, 2-4 Shirane Shirakata, Tokai-mura, Naka-gun, Ibaraki, 319-1195, Japan

    Stefanus Harjo, Takuro Kawasaki, Wu Gong & Kazuya Aizawa

  2. Research Center for Structure Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan

    Yo Tomota

  3. Department of Materials Physics, Eötvös University, P.O. Box 32, Budapest, 1518, Hungary

    Geza Tichy & Tamas Ungár

  4. College of Materials and Chemical Engineering, China Three Gorges University, 8 Daxue Rd, Xiling, Yichang, Hubei, China

    Zengmin Shi

  5. Materials Performance Centre, The University of Manchester, Manchester, M13 9PL, UK

    Tamas Ungár

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  1. Stefanus Harjo
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  2. Takuro Kawasaki
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Correspondence to Stefanus Harjo.

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Manuscript submitted December 15, 2016.

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Harjo, S., Kawasaki, T., Tomota, Y. et al. Work Hardening, Dislocation Structure, and Load Partitioning in Lath Martensite Determined by In Situ Neutron Diffraction Line Profile Analysis. Metall Mater Trans A 48, 4080–4092 (2017). https://doi.org/10.1007/s11661-017-4172-0

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