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Study of Metallurgy and Mechanical Properties of Japanese Swords

机译：日本剑冶金与力学性能研究

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Two Japanese swords, old and modern ones, were examined in bending test with observations of microstructure. They have fine grain sizes and lath martensites at the sharp edge, even though carbon content range is around coexistence region of lenticular martensite and lath martensite. The four points bending test showed the old one was not broken, but modern one was broken. This difference comes from the thickness of hardened area, the transition area from hardened area to core area and the difference of grain size distribution. The estimated strengths of the swords at the sharp edge are 2552 MPa, and 4645 MPa for old and modern ones, respectively. These values are in the range of high performance tool steel.
机译：在弯曲试验中检查了两个日本剑，旧和现代的剑，观察到了微观结构。它们在尖锐的边缘有细粒尺寸和Lath Martensites，即使碳含量范围是透镜晶体和Lath马氏体的共存区域。四点弯曲试验显示旧的测试没有被打破，但现代的人被打破了。这种差异来自硬化区域的厚度，从硬化区域到核心区域的过渡区域和晶粒尺寸分布的差异。尖锐边缘的粗糙度的估计优势分别为2552MPa，以及旧的和现代的4645 MPa。这些值位于高性能工具钢的范围内。

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