Correlation Among the Variant Group,Effective Grain Size,and Elastic Strain Energy During the Phase Transformation in 9Ni Steels |
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Authors: | Hidenori Terasaki Koji Moriguchi Yusaku Tomio Hideki Yamagishi Shigekazu Morito |
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Affiliation: | 1.Faculty of Advanced Science and Technology,Kumamoto University,Kumamoto,Japan;2.Technical Research & Development Bureau,Nippon Steel & Sumitomo Metal Corporation,Tokyo,Japan;3.Toyama Industrial Technology Centre,Toyama,Japan;4.Department of Materials Science,Shimane University,Shimane,Japan |
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Abstract: | The effect of carbon content on the density of variant-pair boundaries was investigated in 9Ni steel using an electron backscatter diffraction patterns method. The changes in the density of variant-pair boundaries were correlated with the nondestructive measured values of shear modulus of the austenite phase at the phase transformation point. Furthermore, the effective grain size was correlated with the shear modulus and the density of variant-pair boundaries. These relations are discussed from the viewpoint of self-accommodation of elastic strain energy and the nucleation event in the bainite and martensitic transformations. |
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