鋼の溶接熱影響部の結晶粒粗大化に及ぼす析出物の影響

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Effect of precipitates on austenite grain growth in weld-heat affected zone (HAZ) was investigated using AIN-bearing steel. That is, grain growth and the behavior of precipitates during rapid heating were examined. Then, grain size in HAZ was examined. In these cases, initial amount and size of precipitates were controlled by pre-heat treatment. Main results obtained are as follows. 1) During rapid heating If initial value for r/f (r : radius of precipitates, f : volume fraction of precipitates) is sufficiently large, the effect of precipitates on grain growth is little. If initial state of precipitates is large in amount and small in size, grains hardly grow untill precipitates begin to dissolve. But, as the dissolution is very rapid, grains grow rapidly when precipitates begin to dissolve. On the other hand, when size of precipitates is large in the initial state, grains grow gradually before precipitates begin to dissolve. As the dissolution of precipitates is gradual, grains grow gradually even when precipitates begin to dissolve. 2) In weld-heat affected zone The same phenomenon as obtained during rapid heating was observed in HAZ, in regard to grain size. That is, if initial state of precipitates is large in amount and small in size, grain size near the fusion line is very coarse, but the grain coarsened zone is narrow. On the other hand, if initial state of precipitate is large in size, the grain coarsened zone is wide but the grain size near the fusion line is not so coarse.
1977-12-05

鋼の溶接熱影響部の結晶粒粗大化に及ぼす析出物の影響

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