共振電磁超音波法による冷延鋼板のオンライン r^^- 値測定技術の開発(材質評価)(<特集>鉄鋼業における最近のセンサ技術)

概要

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An on-line nondestructive measurement technique for r-value (plastic strain ratio), which evaluates the press formability of cold-rolled steel sheets, has been developed. This technique uses a thickness resonance mode electromagnetic acoustic transducer (EMAT), which can measure the ratio of three different mode ultrasonic resonance frequencies. The in-plane average Young's modulus is calculated from three frequencies and the elastic stiffnesses of an iron single crystal C^0_<11>, C^0_<12>, C^0_<44>. The in-plane average r-value is obtained from the in-plane average Young's modulus. A good correspondence was obtained between the in-plane average r-value measured by this method and the in-plane average r-value measured by tensile testing. We have proved by experiment that the effects of temperature, tensile stress and moving speed of steel sheets are negligible for practical on-line use.
社団法人日本鉄鋼協会の論文
1993-07-01