バルクハウゼンノイズ解析による 0.4C-5Cr-Mo-V 熱間工具鋼の焼入冷却速度の推定および靱性の非破壊評価

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The purpose of this paper is to develop a non-destructive method for evaluating cooling-rates (time for cooling from austenitizing temperature to 500℃ (Ht)) from 0.4C-5Cr-Mo-V hot-work tool steel specimens after tempering procedure. For this, the authors tried to employ Barkhausen noise (BHN) signals which were induced during magnetization process. The BHN signals were measured on surfaces of specimens which were cooled with various Ht and were tempered to adjust hardness (H). The experimental results indicated that two BHN parameters, the total energy (V_p) and the maximum output (Vh) of BHN signals were strongly related with microstructure which changed depending on Ht. These relationships could be successfully summarized as experimental expressions, Ht=f(H, V_p) and Ht=f(H, Vh). These results made it clear that non-destructive evaluation of Ht could be achieved by using a hybrid method combining the BHN method with an ordinary hardness test. Then in this paper, the authors confirmed the possibility of estimation of charpy impact values (Ch) through the relationship between Ht, H and Ch.
1989-05-01