Mutual Verification of Phase Fraction Analysis Techniques for Steels Comprising Deformation Induced Martensite Phases: Neutron-Diffraction-Based Rietveld Texture Analysis and Saturation Magnetization Measurement

Yusuke Onuki, Takuro Masumura, Toshihiro Tsuchiyama, Shigeo Sato, Toshiro Tomida, Setsuo Takaki

    研究成果: ジャーナルへの寄稿学術誌査読

    3 被引用数 (Scopus)

    抄録

    The demand for a reliable and quantitative method to determine phase fractions has been increasing due to the developments of multi-phase materials, such as TRIP steels. The authors conducted a mutual verification beÂtween the two methods for phase fraction analysis, the saturation magnetization measurement and the newly developed neutron diffraction technique, neutron-diffraction-based Rietveld texture analysis (NDRTA). The chemical compositions of the current samples were Fe-18Cr-8Ni-1Mn-0.5Si (mass%) with 0, 0.1 or 0.2 mass% of C or N. The α'-martensite volume fractions analyzed by both methods showed a good linear correspondence. The analysis based on the saturation magnetization measurement required an accurate evaluation of the volume saturation magnetization of α'-martensite, which was a function of the chemical composition. The comparison with the result of NDRTA can be an effective method to calibrate the volume saturate magnetization of α'-marÂtensite, especially in the case that a fully transformed standard sample cannot be obtained. NDRTA is also an effective method to determine the fraction of ϵ-marten-site, which is non-magnetic and has a hexagonal close-packed (hcp) structure. Since the hcp phase tends to develop a sharp texture, the conventional X-ray diffracÂtion method without care of texture underestimated its volume fraction. Hence, the simultaneous evaluation of volume fraction and texture by NDRTA is the optimum method to determine the fraction of ϵ-martensite.

    本文言語英語
    ページ(範囲)457-464
    ページ数8
    ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    106
    7
    DOI
    出版ステータス出版済み - 7月 1 2020

    !!!All Science Journal Classification (ASJC) codes

    • 凝縮系物理学
    • 物理化学および理論化学
    • 金属および合金
    • 材料化学

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