アルミニウムキルド鋼板の再結晶挙動におよぼす析出物の影響

概要

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The recrystallization behaviors of two aluminum-killed steels were investigated in isothermal annealing and continuous heating, starting with either as hot-rolled (as taken from productional hot strip coils) or as cold-rolled (ca. 70%). Careful electron microscopy (carbon extraction replica), run along with the measurement of solute nitrogen by internal friction method, revealed that, even when no evidence of AlN precipitation is apparent, there is definitely some precipitation of AlN of almost sub-electron microscopic sizes. The electron diffraction pattern of those minute AlN precipitates did not conform to that of hexagonal AlN, but fit very well with that of a hypothetical cubic AlN of NaCl type structure with a_0=4.047Å. It was seen that the recrystallized textures were closely related to the state of the cubic AlN precipitation ; (1) when the recrystallization began after the precipitation of cubic AlN had progressed to certain extent, in the unrecrystallized region, strong texture with {554}<225> and {111}<011> as its major components resulted, (2) when the precipitation of cubic AlN proceeded concurrently with recrystallization, very strong texture with {111}<011> as its major component resulted, and (3) when the recrystallization had been completed before the precipitation of cubic AlN, the texture was weak, being similar to that of rimmed steel sheets.
社団法人日本鉄鋼協会の論文
1971-02-01