焼もどし脆化した低合金鋼の脱脆化挙動におよぼす Mo の影響

概要

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The effect of Mo content on de-embrittling behavior of 3.5% Ni-Cr-Mo-V steels was studied. Charpy specimens temper embrittled were rapidly heated to three defferent temperatures above the embrittling range and held for several seconds followed by quenching in water, using a high frequency heating device. The main conclusions obtained are as follows : (1) De-embrittlement behavior is rate-controlled by the diffusion process of embrittling species from prior austenite grain boundary to matrix and the diffusion rate is minimized by 0.25% Mo addition. Either decreasing or increasing Mo content leads to the increasing diffusion rate of embrittling species. (2) The activation energy for diffusion, 40kcal/mol, is independent on Mo content. (3) The variation of D with Mo content is in good agreement with the change of embrittling tendency with Mo content.
社団法人日本鉄鋼協会の論文
1977-06-01