窒化した純チタンの疲労強度に及ぼす表面硬化層の影響

概要

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An attempt was made to clarify the effect of a surface-hardened layer produced by gas-nitriding (880℃, 24 hours) on the fatigue strength of pure titanium through experiments concerning the fatigue properties of nitrided pure titanium whose surface-hardened layer was removed to a thickness of 12-60μm. The results are summarized as follows : (1) the fatigue strangth of nitrided pure titanium is improved by removing the compound layer, (2) the fatigue strength of nitrided pure titanium can be reduced because the compound layer posesses a very low fracture toughness compared with that of the matrix, and in addition to this, residual compressive stress in the compound layer is cancelled out by tensile stress developed by the stress magnification effect due to a difference of Young's moduli between the marix and the compound layer.
一般社団法人日本機械学会の論文
1993-07-25