鉄鋼材料の金属組織評価におけるケルビンフォース顕微鏡の応用

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  • Application of Kelvin Probe Force Microscopy to Microstructure Evaluation of Steel
  • テッコウ ザイリョウ ノ キンゾク ソシキ ヒョウカ ニ オケル ケルビンフォース ケンビキョウ ノ オウヨウ

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<p>Knowing the essence of metallurgical structure is vital for quality assurance and development of steels. Etching has been widely applied as micro-order evaluation of the structure, however not always reliable especially for fine and complex microstructures. The purpose of this study, therefore, is to clarify the application of Kelvin Probe Force Microscopy (KFM) for the evaluation of the fine and complex microstructures.</p><p>Potential distribution images obtained by KFM were compared with the various images obtained by SEM, EBSD and EPMA for a duplex stainless steel (ASTM A 182 UNS S32750) and a Cu contained low alloy steel (ASTM A707 steel).</p><p>The KFM was able to clearly identify α, γ, σ and a fresh γ phase in the duplex stainless steel. Moreover, it is concluded that the σ phase itself does not lower corrosion resistance, but on the other hand, the fresh γ phase co-generated with the σ phase can be attributed to the poor corrosion resistance and low toughness of the duplex stainless steel. From the KFM results for the Cu contained low alloy steel, the surface potential distribution obviously depends on surface crystal orientation and chemical compositions, which generally correspond to a work function. The KFM is able to directly show the work function of the surface as the potential distribution. Using the KFM, microstructural features and differences were obviously detected after the two-phase heat treatment for the Cu contained low alloy steel, which corresponds to a better balance of strength and toughness.</p><p>The present study clarified that the KFM is an effective method to evaluate the metallurgical essence of microstructure especially for the steel having various phases.</p>

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  • 鉄と鋼

    鉄と鋼 106 (1), 39-49, 2020

    一般社団法人 日本鉄鋼協会

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