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

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  • Onuki Yusuke
    Frontier Research Center for Applied Atomic Sciences, Ibaraki University
  • Masumura Takuro
    Research Center for Steel, Kyushu University
  • Tsuchiyama Toshihiro
    Research Center for Steel, Kyushu University Department of Materials Science and Engineering, Kyushu University
  • Sato Shigeo
    Frontier Research Center for Applied Atomic Sciences, Ibaraki University Graduate School of Science and Engineering, Ibaraki University
  • Tomida Toshiro
    Frontier Research Center for Applied Atomic Sciences, Ibaraki University
  • Takaki Setsuo
    Research Center for Steel, Kyushu University

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Other Title
  • 中性子回折測定に基づくRietveld Texture Analysisおよび飽和磁化測定による加工誘起マルテンサイトを含有する鋼の相分率解析精度の相互検証
  • チュウセイシ カイセツ ソクテイ ニ モトズク Rietveld Texture Analysis オヨビ ホウワ ジカ ソクテイ ニ ヨル カコウ ユウキ マルテンサイト オ ガンユウ スル ハガネ ノ ソウ ブンリツ カイセキ セイド ノ ソウゴ ケンショウ

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<p>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 between 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’-martensite, 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-martensite, 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 diffraction 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.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 106 (7), 457-464, 2020

    The Iron and Steel Institute of Japan

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